Development of the frequency scanning reflectometry for the registration of Alfvén wave resonances in the TCABR tokamak

Size: px
Start display at page:

Download "Development of the frequency scanning reflectometry for the registration of Alfvén wave resonances in the TCABR tokamak"

Transcription

1 Development of the frequency scanning reflectometry for the registration of Alfvén wave resonances in the TCABR tokamak L. F. Ruchko, R. M. O. Galvão, A. G. Elfimov, J. I. Elizondo, and E. Sanada Instituto de Física, Universidade de São Paulo, , São Paulo, BRASIL M. Manso, and A. Silva Associacão EURATOM/IST Centro de Fusão Nuclear, Instituto Superior Técnico, Av. Rovisco Pais 1, , Lisbon, Portugal Abstract The progress of the experimental studies on the application of the frequency scanning microwave reflectometry to the analysis of the high frequency (HF) density perturbations, which are driven by the local Alfvén wave (AW) resonances, in the tokamak TCABR is presented. As it was shown in the previous TCABR experiments [1], these AW driven density perturbations can be registered by the microwave scanning reflectometer technique. These studies are focused on the demonstration of the possibility to use the active excitation of the AW spatially localized plasma density perturbations for the determination of the safety factor q-value profile q (r) and effective ion mass M eff in the tokamak diagnostics. Physics motivations are following: Possibility to excite localized Alfvén wave resonances close to the magnetic surfaces in the predefined plasma regions by external antennae; Amplitude of the AW driven density oscillations is directly connected with the local AW power deposition P; Sensitivity of the reflected microwave signal to the plasma density oscillations in the cutoff layer is high; Narrow band amplification and synchronous detection of the reflected signal at the AW generator frequency increases the selectivity. In this paper we present the experimental results, which were obtained with the existing low frequency reflectometer system, in which the improvements in the data acquisition system were made, and present the new reflectometer system with wider frequency range of the operation, which will be installed soon and which ensures the

2 possibility to investigate the AW driven plasma density oscillations at the higher plasma densities. Low frequency range of the reflectometer f = GHz, which was used in the experiments in the TCABR tokamak, gives the possibility to study AW power deposition only at the plasma periphery in the low density regimes of the TCABR tokamak. Experiments have shown that intensive density oscillations at the AW frequency are detected by the reflectometer close to the plasma boundary. 1. Introduction Nowadays the microwave reflectometry is routinely used for studying the structure of magneto-hydrodynamic and turbulent fluctuations in fusion plasmas due to its sensitivity to plasma density oscillations in the cutoff layer. New wide possibilities of this diagnostic technique can be realized by integrating it with AW excitation of the density oscillations by external antennae. In this case coherent plasma density oscillations are excited in predefined plasma regions, and their registration by the reflectometry technique can be used for diagnostic purposes. The magnitude of plasma density oscillations in the course of the AW excitation has maximum value in the vicinity of the AW resonance layer. Its position can be found from the equation // ( ) ( )(1 = k ra C A ra 2 ). (1) k ( ) N 1 + M, CA is Alfvén velocity, ci is the effective where // r = ( ) R Nq( r) cyclotron frequency taking into account impurities. The numerical calculations show that the density fluctuations are concentrated within few ion gyroradii of the resonance layer. The localization of this zone depends both on the frequency and wave numbers M, N of the excited wave, and on the local plasma parameters n e (r), q (r), M eff. In the case of the O-mode reflectometer the AW dispersion in the plasma region, where the reflectometer signal is reflected, can be simplified [1]. ci N R M 1 + Nq( r A ) me m M i eff = c ce ci (2)

3 It is seen that this expression does not depend on the plasma density explicitly, but only implicitly through q ( r A ). It means that AW parameters M, N, and reflectometer frequency directly determine q(r) and M eff. This fact helps us to identify the excited mode numbers M, N and to find the q(r) values. For example, if plasma density increases in the course of discharge, the AW resonance zone moves to the plasma boundary, where q r ) is larger. In this case, if AW modes with M N > 0 ( A are excited, the reflectometer will detect the increased AW modulation of the reflected signal at lower frequencies. This effect is not present for AW modes with M=0, which can be excited due to the toroidal effects. 2. Experimental setup The experiments were carried out in the tokamak TCABR (a=0.18m, R=0.61m, B = 1.1T). The basic parameters in this investigation were the following. Plasma current: Ip = ka; edge safety factor: q(a) 3.1-4; line averaged plasma density: < n e >= ( ) m -3 ; working gas: hydrogen. In the basic regime of operation, the AW antenna straps in the same toroidal cross-sections are fed by currents with ( 0, π ) phasing so that they can excite mainly the modes M = ± 1; N = ±1, ± 2... The power absorbed by the plasma was limited to P ~ 40 kw. The registration of the AW driven density oscillations was carried out by a microwave reflectometer, which was developed in IST/CFN (Lisbon, Portugal), and operates at the frequency band of 16 to 25.5 GHz. Its scheme is shown in Fig.1. The reflectometer was adapted to the AW experiments in the TCABR. In order to register small signals in the AW frequency band, additional high sensitive selective amplifiers were constructed. The output signal from the diode (9) is preamplified and then is divided in into two parts and then is conditioned in two channels. One signal is amplified by the wide band amplifier (10) and then is directed to VME through the low pass filter. This signal is used for plasma radial profile reconstruction. Second part is amplified by the selective amplifier (11) with pass-band frequency f=(4.0±0.5) MHz, which corresponds to the excited AW frequency. Then this signal is rectified, time integrated with τ 5 s and acquired by the VME. The VME sampling frequency was RC µ f S =3 MHz.

4 Fig.1. Schematic representation of the reflectometer diagnostic scheme: 1- functional signal generator; 2- HTO oscillator f= GHz; 3 frequency doubler; 4,7 DC break; 5 - directional coupler; 6 reference pin; 8 microwave isolator; 9 microwave diode detector; 10 wide band amplifier; 11 narrow band selective amplifier; 12 data acquisition system. The data analysis includes the determination of the amplitude and spectral characteristics of these signals and their dependence on the variation of plasma current and line averaged plasma density <n(t)>. Output reflectometer signal Narrow band amplifier (f=f A ) and rectifier Frequency modulating signal τ VME (fs=3.0mhz) Profile n e (r,t) reconstruction VME (fs=3.0mhz) A(f refl,t) contour plot Fig.2 Block-scheme of the reflectometer data analysis. 3. Experimental results The registration of Alfvén wave resonances by microwave reflectometry was studied in the typical experimental conditions of the tokamak TCABR. Because of the low frequency band of the reflectometer GHz the initial rather low value of the line averaged plasma density 19 n ( ) 10 m 3 was chosen. The typical

5 traces of the plasma parameters are shown in Fig.2(a). The zoomed traces of the reflectometer output and of the frequency modulating voltage are shown in Fig.2(b). In the course of the reflectometer frequency sweeping the amplitude of the diode signal is increased when the microwave cutoff zone coincides with AW resonance zone. In this case the continuous sweeping of the reflectometer frequency will result in the repetitive Fig.3(a). Shot # From the top to the bottom: plasma current, loop voltage, reflectometer modulating signal, output reflectometer signal at f=4 MHz, plasma density Fig3(b). Shot # Expanded traces of the reflectometer output Vd and of the frequency modulating voltage Vm. enhancements of the diode signal for the certain reflectometer frequencies, which vary with the plasma parameters. In the following data analysis the output reflectometer signal at the Alfvén wave frequency f=4 MHz was transformed in the reflectometer frequency-time plane, and the amplitude of the diode signal was presented by the color, which is linearly mapped to the given colormap in Fig.4. It is seen that the chain of repetitive increases of the reflectometer signal occurs inside the time interval t= ms in the reflectometer frequency range f GHz. They correspond to increase of density oscillations induced by AW absorption near the resonant surface. The calculations show that this surface can be identified as M= ± 1, N= m 2 Alfvén wave resonant surface. In this case after substitution the known values in the Eq.2 we can receive the expression for local value q(r AW ). The value r AW can be found after density profile reconstruction. 34 q( raw ) = (3) f Aeff

6 1 2 3 Fig.4 The output signal from the reflectometer at the Alfvén wave frequency as function of the discharge time and of the reflectometer frequency These results have to be considered as illustrative example only. The reflectometer system, which was used in these experiments, has many shortcomings. The main of them are following: Narrow reflectometer frequency range f=16-25 GHz, which makes it possible to study only plasma periphery, Slow velocity of the frequency scanning; High sensitivity to the noise In order to overcome them the new reflectometer for TCABR was constructed in the Instituto Superior Técnico (Portugal). 4. Main characteristics of the new reflectometer for the TCABR tokamak Main objectives, which can be reached with the new reflectometer, are: - Measurement of the temporary evolution of the plasma radial profile over the whole plasma column (external side); - Measurement of the fast variations of the density profile (τ 100 µs). - Measurement of the density fluctuations; - Measurement of the density oscillations induced by Alfvén waves at the frequencies from 3 to 6 MHz. These objectives determine the following reflectometer characteristics.

7 - Operation in 4 frequency bands: K, Ka, U and V. It corresponds to frequencies in the interval GHz. - It can operate in the regimes O and X (ordinary and extraordinary), in agreement with the conditions of accessibility of the area of the plasma to be probed. - Density range: - (0,45-6,4) x m -3 (O- mode); - (0-4,2) x m -3 (X -mode). - Flexibility to operate at the fixed frequencies or in sweeping regime (chosen by the software). - In the sweeping regime the reflectometer will be used to determine the radial profile of plasma density in TCABR. - In fixed frequency regime the reflectometer can be used for turbulence studies and for correlation study of the density oscillations. - The band width of the detectors and of the amplifiers of IF (intermediate frequency) will be of the order of 20 MHz, making possible the study the density oscillations associated with the heating by Alfvén waves. The frequency bands refer to the following frequency ranges: K: 12,4-26,5 GHz Ka: 26,5-40,0 GHz U: 40,0-60,0 GHz V: 50,0-75,0 GHz The solution proposed in this project consists in joining the frequency bands in two groups (K, Ka) and (U, V), each one of the two groups will have an independent hardware, their own sources, detectors, wave-guides and antennas. In Fig. 5 it is shown one of the groups, which corresponds, for instance, to the bands K and Ka. This reflectometer is of the homodyne type. It is capable to sweep the whole frequency range (18-72 GHz) in µs, with band width of the receiver 8 MHz, and can operate in regimes at fixed frequencies, in sweeping mode or in the combination of both during a tokamak shot. The choice of HTOs as generators of microwaves for the reflectometer doesn't present doubts: they are wide band devices, they allow very short times to sweep the band, it has good spectrum purity and high reliability. The diodes PIN are a cheap solution to toggle the system very quickly between the bands K and Ka and between the bands U and V. The frequency multipliers have to be active (they are more expensive) to provide enough power. The passive multipliers have very high losses.

8 Fig.5 Schematic representation of the new reflectometer diagnostic scheme of TCABR tokamak.

9 Conclusions Low frequency range of the used reflectometer f = GHz gives the possibility to study AW power deposition only at the plasma periphery in the low density regimes of the TCABR tokamak; Experiments have shown that intensive density oscillations at the AW frequency are detected by the reflectometer close to the plasma boundary. The new reflectomer, which will be installed in the TCABR tokamak, can provide the investigations of AW driven plasma density oscillations in the inner plasma regions. A combination of sweeping the frequency of the AW excitation system with scanning of the reflectometer frequency may be a very powerful diagnostic tool to localize the AW power deposition and to find the effective mass number M eff and q- profiles in tokamaks. Acknowledgment This work has been supported by the State of São Paulo Research Foundation - FAPESP. References [1] L. F. Ruchko, R. M. O. Galvão, E. A. Lerche, A. G. Elfimov, V. Bellintani Jr, J. I. Elizondo, A. N. Fagundes, A. M. M. Fonseca, Yu.K. Kuznetsov, I. C. Nascimento, W. P. de Sá, E. Sanada, R. P.da Silva, R. Valencia, Rev. Sci. Instrum. 75, 655 (2004). [2] A.G. Elfimov, L.F. Ruchko, R.M.O. Galvão et al. Nuclear Fusion, v. 46, 722 (2006).

Electron density profile reconstruction on the TCABR sweeping reflectometer

Electron density profile reconstruction on the TCABR sweeping reflectometer Journal of Physics: Conference Series PAPER OPEN ACCESS Electron density profile reconstruction on the TCABR sweeping reflectometer To cite this article: A M M Fonseca et al 2015 J. Phys.: Conf. Ser. 591

More information

Automatic electron density measurements with microwave reflectometry during highdensity H-mode discharges on ASDEX Upgrade

Automatic electron density measurements with microwave reflectometry during highdensity H-mode discharges on ASDEX Upgrade Automatic electron density measurements with microwave reflectometry during highdensity H-mode discharges on ASDEX Upgrade A. Silva, P. Varela, L. Cupido, M. Manso, L. Meneses, L.Guimarãis, G. Conway 2,

More information

ECE Radiometry in the TCABR Tokamak

ECE Radiometry in the TCABR Tokamak Brazilian Journal of Physics, vol. 34, no. 4B, December, 2004 1771 ECE Radiometry in the TCABR Tokamak R. P. da Silva, A. M. M. Fonseca, J. H. Vuolo, E. R. Calderon, R. M. O. Galvão, Yu. K. Kuznetzov,

More information

Improved core transport triggered by off-axis ECRH switch-off on the HL-2A tokamak

Improved core transport triggered by off-axis ECRH switch-off on the HL-2A tokamak Improved core transport triggered by off-axis switch-off on the HL-2A tokamak Z. B. Shi, Y. Liu, H. J. Sun, Y. B. Dong, X. T. Ding, A. P. Sun, Y. G. Li, Z. W. Xia, W. Li, W.W. Xiao, Y. Zhou, J. Zhou, J.

More information

ICRF Mode Conversion Flow Drive Studies with Improved Wave Measurement by Phase Contrast Imaging

ICRF Mode Conversion Flow Drive Studies with Improved Wave Measurement by Phase Contrast Imaging 57 th APS-DPP meeting, Nov. 2015, Savannah, GA, USA ICRF Mode Conversion Flow Drive Studies with Improved Wave Measurement by Phase Contrast Imaging Yijun Lin, E. Edlund, P. Ennever, A.E. Hubbard, M. Porkolab,

More information

Study of Ion Cyclotron Emissions due to DD Fusion Product Ions on JT-60U

Study of Ion Cyclotron Emissions due to DD Fusion Product Ions on JT-60U 1 Study of Ion Cyclotron Emissions due to DD Fusion Product Ions on JT-6U M. Ichimura 1), M. Katano 1), Y. Yamaguchi 1), S. Sato 1), Y. Motegi 1), H. Muro 1), T. Ouchi 1), S. Moriyama 2), M. Ishikawa 2),

More information

Reflectometry for density and fluctuation measurement on EAST

Reflectometry for density and fluctuation measurement on EAST Reflectometry for density and fluctuation measurement on EAST Tao Zhang*, Shoubiao Zhang, Fei Wen, Hao Qu, Yumin Wang, Xiang Han, Defeng Kong, Xiang Gao and EAST contributor Institute of Plasma Physics,

More information

Microwave reflectometry for plasma density profile. measurements on HL-2A tokamak

Microwave reflectometry for plasma density profile. measurements on HL-2A tokamak Microwave reflectometry for plasma density profile measurements on HL-A tokamak Xiao Weiwen, Liu Zetian, Ding Xuantong, Shi Zhongbin Southwestern Institute of Physics, Chengdu, 610041, China Vladimir Zhuravlev

More information

Measurements of Mode Converted ICRF Waves with Phase Contrast Imaging in Alcator C-Mod

Measurements of Mode Converted ICRF Waves with Phase Contrast Imaging in Alcator C-Mod Measurements of Mode Converted ICRF Waves with Phase Contrast Imaging in Alcator C-Mod N. Tsujii, M. Porkolab, E.M. Edlund, L. Lin, Y. Lin, J.C. Wright, S.J. Wukitch MIT Plasma Science and Fusion Center

More information

Particle Simulation of Lower Hybrid Waves in Tokamak Plasmas

Particle Simulation of Lower Hybrid Waves in Tokamak Plasmas Particle Simulation of Lower Hybrid Waves in Tokamak Plasmas J. Bao 1, 2, Z. Lin 2, A. Kuley 2, Z. X. Wang 2 and Z. X. Lu 3, 4 1 Fusion Simulation Center and State Key Laboratory of Nuclear Physics and

More information

Diagnostic development to measure parallel wavenumber of lower hybrid waves on Alcator C-Mod

Diagnostic development to measure parallel wavenumber of lower hybrid waves on Alcator C-Mod Diagnostic development to measure parallel wavenumber of lower hybrid waves on Alcator C-Mod S. G. Baek, T. Shinya*, G. M. Wallace, S. Shiraiwa, R. R. Parker, Y. Takase*, D. Brunner MIT Plasma Science

More information

3D-MAPTOR Code for Computation of Magnetic Fields in Tokamaks

3D-MAPTOR Code for Computation of Magnetic Fields in Tokamaks 3D-MAPTOR Code for Computation of Magnetic Fields in Tokamaks J. Julio E. Herrera-Velázquez 1), Esteban Chávez-Alaercón 2) 1) Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, México

More information

Investigating High Frequency Magnetic Activity During Local Helicity Injection on the PEGASUS Toroidal Experiment

Investigating High Frequency Magnetic Activity During Local Helicity Injection on the PEGASUS Toroidal Experiment Investigating High Frequency Magnetic Activity During Local Helicity Injection on the PEGASUS Toroidal Experiment Nathan J. Richner M.W. Bongard, R.J. Fonck, J.L. Pachicano, J.M. Perry, J.A. Reusch 59

More information

2D Physical optics simulation of fluctuation reflectometry

2D Physical optics simulation of fluctuation reflectometry 3rd Intl. Reflectometer Wksp. for Fusion Plasmas. Madrid, May 1997. Informes Técnicos Ciemat 838 39 2D Physical optics simulation of fluctuation reflectometry GDConway Plasma Physics Lab., University of

More information

Density Fluctuation Measurements Using a Frequency Hopping Reflectometer in JT-60U

Density Fluctuation Measurements Using a Frequency Hopping Reflectometer in JT-60U Density Fluctuation Measurements Using a Frequency Hopping Reflectometer in JT-60U Naoyuki OYAMA, Hidenobu TAKENAGA, Takahiro SUZUKI, Yoshiteru SAKAMOTO, Akihiko ISAYAMA and the JT-60 Team Japan Atomic

More information

Overview and Initial Results of the ETE Spherical Tokamak

Overview and Initial Results of the ETE Spherical Tokamak Overview and Initial Results of the ETE Spherical Tokamak L.A. Berni, E. Del Bosco, J.G. Ferreira, G.O. Ludwig, R.M. Oliveira, C.S. Shibata, L.F.F.P.W. Barbosa, W.A. Vilela Instituto Nacional de Pesquisas

More information

Advanced Density Profile Reflectometry; the State-of-the-Art and Measurement Prospects for ITER

Advanced Density Profile Reflectometry; the State-of-the-Art and Measurement Prospects for ITER Advanced Density Profile Reflectometry; the State-of-the-Art and Measurement Prospects for ITER by E.J. Doyle With W.A. Peebles, L. Zeng, P.-A. Gourdain, T.L. Rhodes, S. Kubota and G. Wang Dept. of Electrical

More information

Ion Heating Arising from the Damping of Short Wavelength Fluctuations at the Edge of a Helicon Plasma Source

Ion Heating Arising from the Damping of Short Wavelength Fluctuations at the Edge of a Helicon Plasma Source Ion Heating Arising from the Damping of Short Wavelength Fluctuations at the Edge of a Helicon Plasma Source Division of Plasma Physics American Physical Society October 2012 Providence, RI Earl Scime,

More information

Non-inductive Production of Extremely Overdense Spherical Tokamak Plasma by Electron Bernstein Wave Excited via O-X-B Method in LATE

Non-inductive Production of Extremely Overdense Spherical Tokamak Plasma by Electron Bernstein Wave Excited via O-X-B Method in LATE 1 EXW/P4-4 Non-inductive Production of Extremely Overdense Spherical Tokamak Plasma by Electron Bernstein Wave Excited via O-X-B Method in LATE H. Tanaka, M. Uchida, T. Maekawa, K. Kuroda, Y. Nozawa, A.

More information

ICRF mode conversion in three-ion species heating experiment and in flow drive experiment on the Alcator C- Mod tokamak

ICRF mode conversion in three-ion species heating experiment and in flow drive experiment on the Alcator C- Mod tokamak ICRF mode conversion in three-ion species heating experiment and in flow drive experiment on the Alcator C- Mod tokamak The MIT Faculty has made this article openly available. Please share how this access

More information

Lower Hybrid. Ron Parker Alcator C-Mod PAC Meeting January January 2006 Alcator C-Mod PAC Meeting 1

Lower Hybrid. Ron Parker Alcator C-Mod PAC Meeting January January 2006 Alcator C-Mod PAC Meeting 1 Lower Hybrid Ron Parker Alcator C-Mod PAC Meeting 25-27 January 2006 25-27 January 2006 Alcator C-Mod PAC Meeting 1 Goal of Lower Hybrid Current Drive Experiments Use Lower Hybrid Current Drive to supplement

More information

Variation of N and its Effect on Fast Wave Electron Heating on LHD

Variation of N and its Effect on Fast Wave Electron Heating on LHD J. Plasma Fusion Res. SERIES, Vol. 6 (004) 6 (004) 64 646 000 000 Variation of N and its Effect on Fast Wave Electron Heating on LHD TAKEUCHI Norio, SEKI Tetsuo 1, TORII Yuki, SAITO Kenji 1, WATARI Tetsuo

More information

Observation of Electron Bernstein Wave Heating in the RFP

Observation of Electron Bernstein Wave Heating in the RFP Observation of Electron Bernstein Wave Heating in the RFP Andrew Seltzman, Jay Anderson, John Goetz, Cary Forest Madison Symmetric Torus - University of Wisconsin Madison Department of Physics Aug 1, 2017

More information

Microwave Experiments on Prairie View Rotamak

Microwave Experiments on Prairie View Rotamak Microwave Experiments on Prairie View Rotamak R. J. Zhou,, M. Xu, and Tian-Sen Huang ) Prairie View A&M University, Prairie View, Texas 776, USA ) Institute of Plasma Physics, Chinese Academy of Sciences,

More information

Excitation and Propagation of Low Frequency Waves in a FRC plasma

Excitation and Propagation of Low Frequency Waves in a FRC plasma 1 Excitation and Propagation of Low Frequency Waves in a FRC plasma S. Okada, K. Yamanaka, S. Yamamoto, T. Masumoto, K. Kitano, T. Asai, F. Kodera, M. Inomoto, S. Yoshimura, M. Okubo, S. Sugimoto, S. Ohi

More information

External Stimulation of Edge Modes

External Stimulation of Edge Modes External Stimulation of Edge Modes Alan Binus, Willy Burke, Ambrogio Fasoli, Theodore Golfinopoulos, Robert Granetz, Martin Greenwald, Jerry Hughes, Yijun Lin, Brian LaBombard, Rick Leccacorvi, Ronald

More information

RF Physics: Status and Plans

RF Physics: Status and Plans RF Physics: Status and Plans Program Advisory Committee meeting February 6-7, 2002 S. J. Wukitch Outline: 1. Overview of RF Physics issues 2. Review of antenna performance and near term modifications.

More information

GA A24030 ECE RADIOMETER UPGRADE ON THE DIII D TOKAMAK

GA A24030 ECE RADIOMETER UPGRADE ON THE DIII D TOKAMAK GA A24030 ECE RADIOMETER UPGRADE ON THE DIII D TOKAMAK by M.E. AUSTIN, and J. LOHR AUGUST 2002 DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government.

More information

SOL Reflectometer for Alcator C-Mod

SOL Reflectometer for Alcator C-Mod Alcator C-Mod SOL Reflectometer for Alcator C-Mod C. Lau 1 G. Hanson 2, J. B. Wilgen 2, Y. Lin 1, G. Wallace 1, and S. J. Wukitch 1 1 MIT Plasma Science and Fusion Center, Cambridge, MA 02139 2 Oak Ridge

More information

Spectral broadening of lower hybrid waves produced by parametric instability in current drive experiments of tokamak plasmas

Spectral broadening of lower hybrid waves produced by parametric instability in current drive experiments of tokamak plasmas INSTITUTE OF PHYSICS PUBLISHING and INTERNATIONAL ATOMIC ENERGY AGENCY NUCLEAR FUSION Nucl. Fusion 46 (2006) 462 476 doi:10.1088/0029-5515/46/4/007 Spectral broadening of lower hybrid waves produced by

More information

Particle Simulation of Radio Frequency Waves in Fusion Plasmas

Particle Simulation of Radio Frequency Waves in Fusion Plasmas 1 TH/P2-10 Particle Simulation of Radio Frequency Waves in Fusion Plasmas Animesh Kuley, 1 Jian Bao, 2,1 Zhixuan Wang, 1 Zhihong Lin, 1 Zhixin Lu, 3 and Frank Wessel 4 1 Department of Physics and Astronomy,

More information

Relative Frequency Calibration for Fast Frequency Sweep Microwave Reflectometry

Relative Frequency Calibration for Fast Frequency Sweep Microwave Reflectometry Relative Frequency Calibration for Fast Frequency Sweep Microwave Reflectometry Akira EJIRI, Yoshiyuki SHIMADA, Takuma YAMADA 1), Takuya OOSAKO, Yuichi TAKASE and Hiroshi KASAHARA 2) Graduate School of

More information

Fast Electron Temperature Diagnostic Based on Langmuir Probe Current Harmonic Detection on D-IIID

Fast Electron Temperature Diagnostic Based on Langmuir Probe Current Harmonic Detection on D-IIID Fast Electron Temperature Diagnostic Based on Langmuir Probe Current Harmonic Detection on D-IIID D.L. Rudakov, J. A. Boedo, R. D. Lehmer*, R. A. Moyer, G. Gunner - University of California, San Diego

More information

3.10 Lower Hybrid Current Drive (LHCD) System

3.10 Lower Hybrid Current Drive (LHCD) System 3.10 Lower Hybrid Current Drive (LHCD) System KUANG Guangli SHAN Jiafang 3.10.1 Purpose of LHCD program 3.10.1.1 Introduction Lower hybrid waves are quasi-static electric waves propagated in magnetically

More information

4. REFLECTOMETRY DIAGNOSTICS FOR FUSION PLASMAS

4. REFLECTOMETRY DIAGNOSTICS FOR FUSION PLASMAS . REFLECTOMETRY DIAGNOSTICS FOR FUSION PLASMAS M.E. Manso and F. Serra (Heads), L. Cupido, A. Silva, F. Nunes, I. Nunes, F. Silva, J. Santos, L. Meneses, P. Varela, S. Vergamota, V. Grossmann, T. Ribeiro.1.

More information

Helicon Wave Current Drive in KSTAR Plasmas

Helicon Wave Current Drive in KSTAR Plasmas Daejeon Helicon Wave Current Drive in KSTAR Plasmas S. J. Wanga, H. J. Kima, Jeehyun Kima, V. Vdovinb, B. H. Parka, H. H. Wic, S. H. Kimd, and J. G. Kwaka anational Fusion Research Institute, Daejeon,

More information

EXPERIMENTAL SETUP AIMED TO STUDY THE ELECTRICAL IMPEDANCE VARIATIONS OF A PLASMA COLUMN IN A WIDE FREQUENCY RANGE

EXPERIMENTAL SETUP AIMED TO STUDY THE ELECTRICAL IMPEDANCE VARIATIONS OF A PLASMA COLUMN IN A WIDE FREQUENCY RANGE (c) Romanian RRP 66(No. Reports in 3) Physics, 746 753 Vol. 2014 66, No. 3, P. 746 753, 2014 EXPERIMENTAL SETUP AIMED TO STUDY THE ELECTRICAL IMPEDANCE VARIATIONS OF A PLASMA COLUMN IN A WIDE FREQUENCY

More information

Full-wave feasibility study of magnetic diagnostic based on O-X mode conversion and oblique reflectometry imaging

Full-wave feasibility study of magnetic diagnostic based on O-X mode conversion and oblique reflectometry imaging Full-wave feasibility study of magnetic diagnostic based on O-X mode conversion and oblique reflectometry imaging 20 th topical conference on radio frequency power in plasmas Orso Meneghini, M. Choi #,

More information

Study and optimisation of the antennas for the ITER plasma-position reflectometry diagnostics system

Study and optimisation of the antennas for the ITER plasma-position reflectometry diagnostics system 1 Study and optimisation of the antennas for the ITER plasma-position reflectometry diagnostics system H. Hugon IPFN, Instituto Superior Técnico, Avenida Rovisco Pais 1, 1049-001 Lisboa, Portugal Abstract

More information

Development of local oscillator integrated antenna array for microwave imaging diagnostics

Development of local oscillator integrated antenna array for microwave imaging diagnostics Home Search Collections Journals About Contact us My IOPscience Development of local oscillator integrated antenna array for microwave imaging diagnostics This content has been downloaded from IOPscience.

More information

Electromagnetic Field Simulation for ICRF Antenna and Comparison with Experimental Results in LHD

Electromagnetic Field Simulation for ICRF Antenna and Comparison with Experimental Results in LHD Electromagnetic Field Simulation for ICRF Antenna and Comparison with Experimental Results in LHD Takashi MUTOH, Hiroshi KASAHARA, Tetsuo SEKI, Kenji SAITO, Ryuhei KUMAZAWA, Fujio SHIMPO and Goro NOMURA

More information

325 to 500 GHz Vector Network Analyzer System

325 to 500 GHz Vector Network Analyzer System 325 to 500 GHz Vector Network Analyzer System By Chuck Oleson, Tony Denning and Yuenie Lau OML, Inc. Abstract - This paper describes a novel and compact WR-02.2 millimeter wave frequency extension transmission/reflection

More information

Study of Elliptical Polarization Requirement of KSTAR 84-GHz ECH System

Study of Elliptical Polarization Requirement of KSTAR 84-GHz ECH System Journal of the Korean Physical Society, Vol. 49, December 2006, pp. S201 S205 Study of Elliptical Polarization Requirement of KSTAR 84-GHz ECH System Jinhyun Jeong, Youngsoon Bae, Moohyun Cho and Won Namkung

More information

Reflectometry for density and fluctuation measurement on EAST

Reflectometry for density and fluctuation measurement on EAST Reflectometry for density and fluctuation measurement on EAST *, Shoubiao Zhang, Fei Wen, Hao Qu, Yumin Wang, Xiang Han, Defeng Kong, Xiang Gao and EAST contributor Institute of Plasma Physics, Chinese

More information

Initial Data of Digital Correlation ECE with a Giga Hertz Sampling Digitizer

Initial Data of Digital Correlation ECE with a Giga Hertz Sampling Digitizer EPJ Web of Conferences 87, 3 (25) DOI:.5/ epjconf/ 25873 C Owned by the authors, published by EDP Sciences, 25 Initial Data of Digital Correlation ECE with a Giga Hertz Sampling Digitizer Hayato Tsuchiya,a,

More information

UNIT-3. Electronic Measurements & Instrumentation

UNIT-3.   Electronic Measurements & Instrumentation UNIT-3 1. Draw the Block Schematic of AF Wave analyzer and explain its principle and Working? ANS: The wave analyzer consists of a very narrow pass-band filter section which can Be tuned to a particular

More information

Effect of ICRF Mode Conversion at the Ion-Ion Hybrid Resonance on Plasma Confinement in JET

Effect of ICRF Mode Conversion at the Ion-Ion Hybrid Resonance on Plasma Confinement in JET EFDA JET CP()- A.Lyssoivan, M.J.Mantsinen, D.Van Eester, R.Koch, A.Salmi, J.-M.Noterdaeme, I.Monakhov and JET EFDA Contributors Effect of ICRF Mode Conversion at the Ion-Ion Hybrid Resonance on Plasma

More information

Feedback control of ECRH for MHD mode stabilization on TEXTOR

Feedback control of ECRH for MHD mode stabilization on TEXTOR -Institute for Plasma Physics Rijnhuizen Association Euratom- Feedback control of ECRH for MHD mode stabilization on TEXTOR Bart Hennen Tuesday, 25 November, 28 With contributions from: E. Westerhof, M.

More information

QPR No SPONTANEOUS RADIOFREQUENCY EMISSION FROM HOT-ELECTRON PLASMAS XIII. Academic and Research Staff. Prof. A. Bers.

QPR No SPONTANEOUS RADIOFREQUENCY EMISSION FROM HOT-ELECTRON PLASMAS XIII. Academic and Research Staff. Prof. A. Bers. XIII. SPONTANEOUS RADIOFREQUENCY EMISSION FROM HOT-ELECTRON PLASMAS Academic and Research Staff Prof. A. Bers Graduate Students C. E. Speck A. EXPERIMENTAL STUDY OF ENHANCED CYCLOTRON RADIATION FROM AN

More information

Dartmouth College LF-HF Receiver May 10, 1996

Dartmouth College LF-HF Receiver May 10, 1996 AGO Field Manual Dartmouth College LF-HF Receiver May 10, 1996 1 Introduction Many studies of radiowave propagation have been performed in the LF/MF/HF radio bands, but relatively few systematic surveys

More information

H. Y. Lee, J. W. Lee, J. G. Jo, J. Y. Park, S. C. Kim, J. I. Wang, J. Y. Jang, S. H. Kim, Y. S. Na, Y. S. Hwang

H. Y. Lee, J. W. Lee, J. G. Jo, J. Y. Park, S. C. Kim, J. I. Wang, J. Y. Jang, S. H. Kim, Y. S. Na, Y. S. Hwang Study on EBW assisted start-up and heating experiments via direct XB mode conversion from low field side injection in VEST H. Y. Lee, J. W. Lee, J. G. Jo, J. Y. Park, S. C. Kim, J. I. Wang, J. Y. Jang,

More information

Realization, Installation and Testing of the Multichannel Reflectometer s Transmission Lines at ICRF Antenna in Asdex Upgrade

Realization, Installation and Testing of the Multichannel Reflectometer s Transmission Lines at ICRF Antenna in Asdex Upgrade EUROFUSION CP(15)02/14 Realization, Installation and Testing of the Multichannel Reflectometer s Transmission Lines at ICRF Antenna in Asdex Upgrade (14th April 17th April 2015) Frascati, Italy This work

More information

Simulation Studies of Field-Reversed Configurations with Rotating Magnetic Field Current Drive

Simulation Studies of Field-Reversed Configurations with Rotating Magnetic Field Current Drive Simulation Studies of Field-Reversed Configurations with Rotating Magnetic Field Current Drive E. V. Belova 1), R. C. Davidson 1), 1) Princeton University Plasma Physics Laboratory, Princeton NJ, USA E-mail:ebelova@pppl.gov

More information

Microwave Imaging in the Large Helical Device

Microwave Imaging in the Large Helical Device Microwave Imaging in the Large Helical Device T. Yoshinaga 1), D. Kuwahara 2), K. Akaki 3), Z.B. Shi 4), H. Tsuchiya 1), S. Yamaguchi 5), Y. Kogi 6), S. Tsuji-Iio 2), Y. Nagayama 1), A. Mase 3), H. Hojo

More information

Heterodyne Sweeping Radiometer

Heterodyne Sweeping Radiometer 46 Robezu str. LV-1004 Riga, Latvia Fax: +371-7-065102 Mm-wave Division in St. Petersburg, Russia Fax: +7-812- 326-10-60 Tel: +7-812-326-59-24 E-mail: ivanovph@nnz.ru Heterodyne Sweeping Radiometer Operation

More information

Magnetic Reconnection and Ion Flows During Point Source Helicity Injection on the Pegasus Toroidal Experiment

Magnetic Reconnection and Ion Flows During Point Source Helicity Injection on the Pegasus Toroidal Experiment Magnetic Reconnection and Ion Flows During Point Source Helicity Injection on the Pegasus Toroidal Experiment M.G. Burke, R.J. Fonck, J.L. Barr, K.E. Thome, E.T. Hinson, M.W. Bongard, A.J. Redd, D.J. Schlossberg

More information

VARIABLE REPETITION RATE THOMSON SCATTERING SYSTEM FOR THE GLOBUS-M TOKAMAK

VARIABLE REPETITION RATE THOMSON SCATTERING SYSTEM FOR THE GLOBUS-M TOKAMAK VARIABLE REPETITION RATE THOMSON SCATTERING SYSTEM FOR THE GLOBUS-M TOKAMAK S.Yu.Tolstyakov, V.K.Gusev, M.M.Kochergin, G.S.Kurskiev, E.E.Mukhin, Yu.V.Petrov, G.T.Razdobarin A.F. Ioffe Physico-Technical

More information

SUPPLEMENTARY INFORMATION

SUPPLEMENTARY INFORMATION Induction of coherent magnetization switching in a few atomic layers of FeCo using voltage pulses Yoichi Shiota 1, Takayuki Nozaki 1, 2,, Frédéric Bonell 1, Shinichi Murakami 1,2, Teruya Shinjo 1, and

More information

Measurement of Mode Converted ICRF Waves with Phase Contrast Imaging and Comparison with Full-wave Simulations on Alcator C-Mod

Measurement of Mode Converted ICRF Waves with Phase Contrast Imaging and Comparison with Full-wave Simulations on Alcator C-Mod Measurement of Mode Converted ICRF Waves with Phase Contrast Imaging and Comparison with Full-wave Simulations on Alcator C-Mod N. Tsujii 1, M. Porkolab 1, P.T. Bonoli 1, Y. Lin 1, J.C. Wright 1, S.J.

More information

TOROIDAL ALFVÉN EIGENMODES

TOROIDAL ALFVÉN EIGENMODES TOROIDAL ALFVÉN EIGENMODES S.E. Sharapov Euratom/CCFE Fusion Association, Culham Science Centre, Abingdon, Oxfordshire OX14 3DB, UK OUTLINE OF LECTURE 4 Toroidicity induced frequency gaps and Toroidal

More information

Resonant and Non-resonant type Pre-ionization and Current Ramp-up Experiments on Tokamak Aditya in the Ion Cyclotron Frequency Range

Resonant and Non-resonant type Pre-ionization and Current Ramp-up Experiments on Tokamak Aditya in the Ion Cyclotron Frequency Range Resonant and Non-resonant type Pre-ionization and Current Ramp-up Experiments on Tokamak Aditya in the Ion Cyclotron Frequency Range S.V. Kulkarni, Kishore Mishra, Sunil Kumar, Y.S.S. Srinivas, H.M. Jadav,

More information

Non-reciprocal phase shift induced by an effective magnetic flux for light

Non-reciprocal phase shift induced by an effective magnetic flux for light Non-reciprocal phase shift induced by an effective magnetic flux for light Lawrence D. Tzuang, 1 Kejie Fang, 2,3 Paulo Nussenzveig, 1,4 Shanhui Fan, 2 and Michal Lipson 1,5 1 School of Electrical and Computer

More information

Co-current toroidal rotation driven and turbulent stresses with. resonant magnetic perturbations in the edge plasmas of the J-TEXT.

Co-current toroidal rotation driven and turbulent stresses with. resonant magnetic perturbations in the edge plasmas of the J-TEXT. Co-current toroidal rotation driven and turbulent stresses with resonant magnetic perturbations in the edge plasmas of the J-TEXT tokamak K. J. Zhao, 1 Y. J. Shi, H. Liu, P. H. Diamond, 3 F. M. Li, J.

More information

Advanced Tokamak Program and Lower Hybrid Experiment. Ron Parker MIT Plasma Science and Fusion Center

Advanced Tokamak Program and Lower Hybrid Experiment. Ron Parker MIT Plasma Science and Fusion Center Advanced Tokamak Program and Lower Hybrid Experiment Ron Parker MIT Plasma Science and Fusion Center Alcator C-Mod Program Advisory Meeting 23-24 February 2004 Main Goals of the Alcator C-Mod AT Program

More information

Artificial Ionospheric Perturbations Studied During НААRP May-June 2014 campaign

Artificial Ionospheric Perturbations Studied During НААRP May-June 2014 campaign Artificial Ionospheric Perturbations Studied During НААRP May-June 2014 campaign E.N. Sergeev 1,2, A.V. Shindin 1, S.M. Grach 1, G.M. Milikh 3 1 Lobachevsky State University of Nizhni Novgorod, Gagarin

More information

High-Resolution Detection and 3D Magnetic Control of the Helical Boundary of a Wall-Stabilized Tokamak Plasma

High-Resolution Detection and 3D Magnetic Control of the Helical Boundary of a Wall-Stabilized Tokamak Plasma 1 EX/P4-19 High-Resolution Detection and 3D Magnetic Control of the Helical Boundary of a Wall-Stabilized Tokamak Plasma J. P. Levesque, N. Rath, D. Shiraki, S. Angelini, J. Bialek, P. Byrne, B. DeBono,

More information

Levitated Dipole Experiment

Levitated Dipole Experiment Microwave Interferometer Density Diagnostic for the Levitated Dipole Experiment Columbia University A. Boxer, J. Kesner MIT PSFC M.E. Mauel, D.T. Garnier, A.K. Hansen, Columbia University Presented at

More information

Helicon mode formation and rf power deposition in a helicon source

Helicon mode formation and rf power deposition in a helicon source Helicon mode formation and rf power deposition in a helicon source Michael Krämer & Kari Niemi Institut für Experimentalphysik II, Ruhr-Universität D-4478 Bochum, Germany Helicon Mini-Conference APS-DPP,

More information

Nd:YSO resonator array Transmission spectrum (a. u.) Supplementary Figure 1. An array of nano-beam resonators fabricated in Nd:YSO.

Nd:YSO resonator array Transmission spectrum (a. u.) Supplementary Figure 1. An array of nano-beam resonators fabricated in Nd:YSO. a Nd:YSO resonator array µm Transmission spectrum (a. u.) b 4 F3/2-4I9/2 25 2 5 5 875 88 λ(nm) 885 Supplementary Figure. An array of nano-beam resonators fabricated in Nd:YSO. (a) Scanning electron microscope

More information

Localization of MHD and fast particle modes using reflectometry in ASDEX Upgrade

Localization of MHD and fast particle modes using reflectometry in ASDEX Upgrade Localization of MHD and fast particle modes using reflectometry in ASDEX Upgrade S da Graça 1, G D Conway 2, P Lauber 2, M Maraschek 2, D Borba 1, S Günter 2, L Cupido 1, K Sassenberg 3, F Serra 1, ME

More information

Resonance Cones in Magnetized Plasma

Resonance Cones in Magnetized Plasma Resonance Cones in Magnetized Plasma C. Riccardi, M. Salierno, P. Cantu, M. Fontanesi, Th. Pierre To cite this version: C. Riccardi, M. Salierno, P. Cantu, M. Fontanesi, Th. Pierre. Resonance Cones in

More information

Artificial Ionospheric Perturbations Studied During НААRP May-June 2014 campaign

Artificial Ionospheric Perturbations Studied During НААRP May-June 2014 campaign Artificial Ionospheric Perturbations Studied During НААRP May-June 2014 campaign E.N. Sergeev 1,2, A.V. Shindin 1, S.M. Grach 1, G.M. Milikh 3 1 Lobachevsky State University of Nizhni Novgorod, Gagarin

More information

Speech, music, images, and video are examples of analog signals. Each of these signals is characterized by its bandwidth, dynamic range, and the

Speech, music, images, and video are examples of analog signals. Each of these signals is characterized by its bandwidth, dynamic range, and the Speech, music, images, and video are examples of analog signals. Each of these signals is characterized by its bandwidth, dynamic range, and the nature of the signal. For instance, in the case of audio

More information

Real-time Systems in Tokamak Devices. A case study: the JET Tokamak May 25, 2010

Real-time Systems in Tokamak Devices. A case study: the JET Tokamak May 25, 2010 Real-time Systems in Tokamak Devices. A case study: the JET Tokamak May 25, 2010 May 25, 2010-17 th Real-Time Conference, Lisbon 1 D. Alves 2 T. Bellizio 1 R. Felton 3 A. C. Neto 2 F. Sartori 4 R. Vitelli

More information

Study of Plasma Equilibrium during the AC Current Reversal Phase on the STOR-M Tokamak

Study of Plasma Equilibrium during the AC Current Reversal Phase on the STOR-M Tokamak 1 Study of Plasma Equilibrium during the AC Current Reversal Phase on the STOR-M Tokamak C. Xiao 1), J. Morelli 1), A.K. Singh 1, 2), O. Mitarai 3), T. Asai 1), A. Hirose 1) 1) Department of Physics and

More information

Single-photon excitation of morphology dependent resonance

Single-photon excitation of morphology dependent resonance Single-photon excitation of morphology dependent resonance 3.1 Introduction The examination of morphology dependent resonance (MDR) has been of considerable importance to many fields in optical science.

More information

Timing Noise Measurement of High-Repetition-Rate Optical Pulses

Timing Noise Measurement of High-Repetition-Rate Optical Pulses 564 Timing Noise Measurement of High-Repetition-Rate Optical Pulses Hidemi Tsuchida National Institute of Advanced Industrial Science and Technology 1-1-1 Umezono, Tsukuba, 305-8568 JAPAN Tel: 81-29-861-5342;

More information

Slow and Fast Light Propagation in Erbium-Doped Optical Fibers

Slow and Fast Light Propagation in Erbium-Doped Optical Fibers Slow and Fast Light Propagation in Erbium-Doped Optical Fibers Nick N. Lepeshkin, Aaron Schweinsberg, Matthew S. Bigelow,* George M. Gehring, and Robert W. Boyd The Institute of Optics, University of Rochester,

More information

Lecture Topics. Doppler CW Radar System, FM-CW Radar System, Moving Target Indication Radar System, and Pulsed Doppler Radar System

Lecture Topics. Doppler CW Radar System, FM-CW Radar System, Moving Target Indication Radar System, and Pulsed Doppler Radar System Lecture Topics Doppler CW Radar System, FM-CW Radar System, Moving Target Indication Radar System, and Pulsed Doppler Radar System 1 Remember that: An EM wave is a function of both space and time e.g.

More information

EENG473 Mobile Communications Module 3 : Week # (12) Mobile Radio Propagation: Small-Scale Path Loss

EENG473 Mobile Communications Module 3 : Week # (12) Mobile Radio Propagation: Small-Scale Path Loss EENG473 Mobile Communications Module 3 : Week # (12) Mobile Radio Propagation: Small-Scale Path Loss Introduction Small-scale fading is used to describe the rapid fluctuation of the amplitude of a radio

More information

Overview of ICRF Experiments on Alcator C-Mod*

Overview of ICRF Experiments on Alcator C-Mod* 49 th annual APS-DPP meeting, Orlando, FL, Nov. 2007 Overview of ICRF Experiments on Alcator C-Mod* Y. Lin, S. J. Wukitch, W. Beck, A. Binus, P. Koert, A. Parisot, M. Reinke and the Alcator C-Mod team

More information

PHASE DETECTION USING AD8302 EVALUATION BOARD IN THE SUPERHETERODYNE MICROWAVE INTERFEROMETER FOR LINE AVERAGE PLASMA ELECTRON DENSITY MEASUREMENTS

PHASE DETECTION USING AD8302 EVALUATION BOARD IN THE SUPERHETERODYNE MICROWAVE INTERFEROMETER FOR LINE AVERAGE PLASMA ELECTRON DENSITY MEASUREMENTS PHASE DETECTION USING AD8302 EVALUATION BOARD IN THE SUPERHETERODYNE MICROWAVE INTERFEROMETER FOR LINE AVERAGE PLASMA ELECTRON DENSITY MEASUREMENTS Y. F. Yee, Dr. C.K. Chakrabarty College of Engineering,

More information

EXW/10-2Ra. Avoidance of Disruptions at High β N in ASDEX Upgrade with Off-Axis ECRH

EXW/10-2Ra. Avoidance of Disruptions at High β N in ASDEX Upgrade with Off-Axis ECRH 1 EXW/1-2Ra Avoidance of Disruptions at High β N in ASDEX Upgrade with Off-Axis ECRH B. Esposito 1), G. Granucci 2), M. Maraschek 3), S. Nowak 2), A. Gude 3), V. Igochine 3), R. McDermott 3), E. oli 3),

More information

Compact Torus Injection for Fuelling* C. Xiao, A. Hirose, STOR-M team Plasma Physics Laboratory University of Saskatchewan

Compact Torus Injection for Fuelling* C. Xiao, A. Hirose, STOR-M team Plasma Physics Laboratory University of Saskatchewan Compact Torus Injection for Fuelling* C. Xiao, A. Hirose, STOR-M team (chijin.xiao@usask.ca) Plasma Physics Laboratory University of Saskatchewan 1 \ STOR-M Experiments Improved confinement induced by

More information

Initial Active MHD Spectroscopy Experiments Exciting Stable Alfvén Eigenmodes in Alcator C-Mod

Initial Active MHD Spectroscopy Experiments Exciting Stable Alfvén Eigenmodes in Alcator C-Mod PSFC/JA-03-26 Initial Active MHD Spectroscopy Experiments Exciting Stable Alfvén Eigenmodes in Alcator C-Mod J.A. Snipes, D. Schmittdiel, A. Fasoli*, R.S. Granetz, R.R. Parker 16 December 2003 Plasma Science

More information

Upper limit on turbulent electron temperature fluctuations on Alcator C-Mod APS DPP Meeting Albuquerque 2003

Upper limit on turbulent electron temperature fluctuations on Alcator C-Mod APS DPP Meeting Albuquerque 2003 Upper limit on turbulent electron temperature fluctuations on Alcator C-Mod APS DPP Meeting Albuquerque 2003 Christopher Watts, Y. In (U. Idaho), A.E. Hubbard (MIT PSFC) R. Gandy (U. Southern Mississippi),

More information

Toroidal Geometry Effects in the Low Aspect Ratio RFP

Toroidal Geometry Effects in the Low Aspect Ratio RFP Toroidal Geometry Effects in the Low Aspect Ratio RFP Carl Sovinec Los Alamos National Laboratory Chris Hegna University of Wisconsin-Madison 2001 International Sherwood Fusion Theory Conference April

More information

Enhanced neutron diagnostics data acquisition system based on a time digitizer and transient recorder hybrid module

Enhanced neutron diagnostics data acquisition system based on a time digitizer and transient recorder hybrid module Fusion Engineering and Design 81 (2006) 1873 1877 Enhanced neutron diagnostics data acquisition system based on a time digitizer and transient recorder hybrid module R.C. Pereira a,, A. Combo a, N. Cruz

More information

Poloidal Transport Asymmetries, Edge Plasma Flows and Toroidal Rotation in Alcator C-Mod

Poloidal Transport Asymmetries, Edge Plasma Flows and Toroidal Rotation in Alcator C-Mod Poloidal Transport Asymmetries, Edge Plasma Flows and Toroidal Rotation in B. LaBombard, J.E. Rice, A.E. Hubbard, J.W. Hughes, M. Greenwald, J. Irby, Y. Lin, B. Lipschultz, E.S. Marmar, K. Marr, C.S. Pitcher,

More information

3D full wave code modelling of ECRF plasma heating in tokamaks and ITER at fundamental and second harmonics

3D full wave code modelling of ECRF plasma heating in tokamaks and ITER at fundamental and second harmonics 3D full wave code modelling of ECRF plasma heating in tokamaks and ITER at fundamental and second harmonics Vdovin V.L. RRC Kurchatov Institute Tokamak Physics Institute vdov@nfi.kiae.ru Abstract We present

More information

Development of microwave imaging reflectometry at NIFS

Development of microwave imaging reflectometry at NIFS Vol. 3 (2008) 01-01 Development of microwave imaging reflectometry at NIFS Y. Nagayama 1), D. Kuwahara 2), Z. B. Shi 3), S. Yamaguchi 4), T. Yoshinaga 1), S. Iio 2), S. Sugito 1), Y. Kogi 5), and A. Mase

More information

Workshop on Active control of MHD Stability, Princeton, NJ, 6-8 Nov., RWM control in T2R. Per Brunsell

Workshop on Active control of MHD Stability, Princeton, NJ, 6-8 Nov., RWM control in T2R. Per Brunsell Workshop on Active control of MHD Stability, Princeton, NJ, 6-8 Nov., 2006 RWM control in T2R Per Brunsell P. R. Brunsell 1, J. R. Drake 1, D. Yadikin 1, D. Gregoratto 2, R. Paccagnella 2, Y. Q. Liu 3,

More information

3. (a) Derive an expression for the Hull cut off condition for cylindrical magnetron oscillator. (b) Write short notes on 8 cavity magnetron [8+8]

3. (a) Derive an expression for the Hull cut off condition for cylindrical magnetron oscillator. (b) Write short notes on 8 cavity magnetron [8+8] Code No: RR320404 Set No. 1 1. (a) Compare Drift space bunching and Reflector bunching with the help of Applegate diagrams. (b) A reflex Klystron operates at the peak of n=1 or 3 / 4 mode. The dc power

More information

Data Acquisition and Digital Processing in Nuclear Fusion

Data Acquisition and Digital Processing in Nuclear Fusion Data Acquisition and Digital Processing in Nuclear Fusion Tiago Ferreira de Castro te Lintel Hekkert tiago.hekkert@ist.utl.pt Instituto de Plasmas e Fusão Nuclear (IPFN) Instituto Superior Técnico - IST,

More information

Interdependence of Magnetic Islands, Halo Current and Runaway Electrons in T-10 Tokamak

Interdependence of Magnetic Islands, Halo Current and Runaway Electrons in T-10 Tokamak IAEA-CN-77/EXP2/02 Interdependence of Magnetic Islands, Halo Current and Runaway Electrons in T-10 Tokamak N.V. Ivanov, A.M. Kakurin, V.A. Kochin, P.E. Kovrov, I.I. Orlovski, Yu.D.Pavlov, V.V. Volkov Nuclear

More information

ICRF Physics in KSTAR Steady State

ICRF Physics in KSTAR Steady State ICRF Physics in KSTAR Steady State Operation (focused on the base line operation) Oct. 24, 2005 Jong-gu Kwak on the behalf of KSTAR ICRF TEAM Korea Atomic Energy Research Institute Contents Roles of ICRF

More information

ECRH on the Levitated Dipole Experiment

ECRH on the Levitated Dipole Experiment ECRH on the Levitated Dipole Experiment S. Mahar, J. Kesner, A.C. Boxer, J.E. Ellsworth, I. Karim, A. Roach MIT PSFC A.K. Hansen, D.T. Garnier, M.E. Mauel, E.E.Ortiz Columbia University Presented at the

More information

Magnetometer Based on a Pair of Symmetric Transitions in the 87 Rb Hyperfine Structure

Magnetometer Based on a Pair of Symmetric Transitions in the 87 Rb Hyperfine Structure ISSN 1063-7842, Technical Physics, 2006, Vol. 51, No. 7, pp. 919923. Pleiades Publishing, Inc., 2006. Original Russian Text E.B. Aleksandrov, A.K. Vershovskiœ, A.S. Pazgalev, 2006, published in Zhurnal

More information

Recent Results on RFX-mod control experiments in RFP and tokamak configuration

Recent Results on RFX-mod control experiments in RFP and tokamak configuration Recent Results on RFX-mod control experiments in RFP and tokamak configuration L.Marrelli Summarizing contributions by M.Baruzzo, T.Bolzonella, R.Cavazzana, Y. In, G.Marchiori, P.Martin, E.Martines, M.Okabayashi,

More information

Plasma Confinement by Pressure of Rotating Magnetic Field in Toroidal Device

Plasma Confinement by Pressure of Rotating Magnetic Field in Toroidal Device 1 ICC/P5-41 Plasma Confinement by Pressure of Rotating Magnetic Field in Toroidal Device V. Svidzinski 1 1 FAR-TECH, Inc., San Diego, USA Corresponding Author: svidzinski@far-tech.com Abstract: Plasma

More information