Evaluation of HOM Coupler Probe Heating by HFSS Simulation
|
|
- Shauna McKinney
- 5 years ago
- Views:
Transcription
1 G. Wu, H. Wang, R. A. Rimmer, C. E. Reece Abstract: Three different tip geometries in a HOM coupler on a CEBAF Upgrade Low Loss cavity have been evaluated by HFSS simulation to understand the tip surface heating problem under various situations. The surface heat loss was calculated for modified tip designs and for the standard tip design under different notch tuning conditions. The result shows that detuning the notch frequency reduces surface heating insignificantly. Different tips differ not so much in surface losses. The nail shaped tip with wider tip-to-coupler distance is the best option among three tip geometries if one wants to reduce surface heating while not compromising HOM damping. 09/11/2004
2 Evaluation of HOM Coupler Probe Heating by HFSS Simulation 1. Introduction The probe tip of DESY type High Order Mode (HOM) coupler is located right in the electric field minimum for the cavity fundamental mode to reduce the power transmission through the HOM coupler. This electric filed minimum is also a magnetic field maximum in this transmission line type HOM coupler. The current on the coupler tip surface causes the heating problem. To maximize the HOM damping of CEBAF Upgrade cavities both on Low Loss and High Gradient shapes, the HOM coupler position was moved closer to the end cell. This increased the magnetic field ratio between the coupler tip to the cavity equator and produced extra heat on the coupler tip. If the heat is not sufficiently conducted away through the probe feedthrough, it can lower the cavity quality factor (Q) or cause the tip to become normal conductor. This note describes the simulation results on the local magnetic field around the tip calculated by HFSS code. 2. Computer Model A 3D computer model was constructed as shown in Figure 1. A Low Loss shape, single cell cavity is used as the resonator. A coaxial line was inserted in the left side beam pipe to act as an input probe to transmit RF power. The output is a 50Ω coaxial line connected to the HOM probe tip. The fillet geometries on the notch rod and the two inductive stubs inside of the HOM coupler are eliminated to avoid dense meshes on those corners in the 3D meshing. Fig. 1 3D RF model used in the HFSS simulation. The HOM coupler and the right side beam pipe was cut away by 135-degree to show the inside geometry. The model accuracy was checked through different mesh densities. Three mesh regions were chosen. These are the cavity beam pipe, HOM can and notch cap. To ensure the 1
3 consistency of mesh densities, the HOM can and the notch cap regions were manually seeded as shown in Figure 2. Fig. 2 Manual seeding of the 3D RF model. Meshes for HOM can and notch cap are shown. When the mesh densities of the HOM can and the notch cap were increased, the S 21 transmission curve remained the same for the notch frequency region as shown in Figure 3. This implies that this model is accurate at least for the frequencies between the cavity frequency and the notch frequency. Fig. 3 The transmission coefficient vs. frequency. To calculate the local magnetic field around the tip, the notch frequency has to be tuned into the cavity resonance. This is the most time consuming part of the simulation. Figure 4 shows the tuning process. 2
4 Fig. 4 The frequency tuning of the notch filter. The current HOM coupler tuning procedure to tune the notch gap is to set the notch minimum very close to the cavity resonance. The external Q is around or higher. 3. Local field (a) (b) Fig. 5 The electric field magnitude (a) and magnetic field vector (b) in the HOM can. Figure 5 shows the tip locates in the electric field minimum in the HOM can and corresponding maximum magnetic field wrapped around the center conductor of the HOM coupler. 3
5 For different geometries, the code gives slightly different cavity stored energies. Typically, the cavity equator field and the tip magnetic field are identified as shown in Figure 6. Then the ratio of to the two is calculated. (a) (b) Fig. 6 The magnetic fields at the cavity equator (a) and the tip (b). (a) (b) (c) Fig 7. Three tip geometries: (a) Tip1, standard shape, (b) Tip 2, rod shape, (c) Tip 3, nail shape. Three tip geometries have been modeled as shown in Figure 7. The dimension of Tip 1 is the standard design. Tip 2 is a simple rod with a in round fillet. Tip 3 dimensions are shown in Appendix A. Their local magnetic field is shown in Figure 8. All the tips have a 30-mil gap between the tip and the coupler center conductor (hook). All Q ext s were tuned to around
6 (a) (b) (c) Fig. 8 The local magnetic field around probe Tip 1 (a), Tip 2(b) and Tip 3 (c) 5
7 Table 1. The Tip magnetic field and their associated surface heat loss. (see following notes for details) Tip1 Detuning effect Notch Gap(mm) Freq(Hz) Stored Energy (J) S12 S12 (db) Tip field Qext_HOM Qext_FPC Cap Ring or Back Taper or Rod coax Total loss E E E % 1.31E E E E E E E E E E % 1.17E E E E E E E E E E % 2.56E E E E E E E E E E % 6.22E E E E E E E E E E % 4.20E E E E E E E E E E % 1.59E E E E E E E E E E % 1.06E E E E E E E-05 Different Tip Configurations Tip 1 30mil sharp E E E % 3.40E E E E E E E-05 Tip 1 50mil E E E % 9.04E E E E E E E-05 Tip 1 30mil E E E % 1.31E E E E E E E-05 Tip 2 30mil E E E % 9.21E E E E E-05 Tip 3 30mil E E E % 1.03E E E E E E-06 Note: The table is an editable spreadsheet object. 3.87E-05 Tip 1 Detuning effect lists the parameters for different notch tuning. Tip 1 30 mil sharp is for standard shape Tip 1 with sharper tip corner, tip-coupler gap is 30 mil. Tip 1 50 mil is standard shape tip with tip-to-coupler gap at 50 mil. Tip 2 30 mil is rod shape tip with tip-to-coupler gap at 30 mil. Tip 3 30 mil is nail shape tip with tip-to-coupler gap at 30 mil. Stored energy is for Low Loss shape end-cell between iris to iris. S12 is the transmission S-parameter from input coax to HOM coax output. Tip field is the magnetic field at the middle of the tip surface facing coupler as a percentage of the equator magnetic field. Qext_HOM, Qext_FPC is calculated through single cell stored energy and the corresponding S-parameter for the ports. 2 Cap, Ring/Back, Taper/Rod, coax denotes the value of total H ds for different sections of the probe as shown in the picture below. Total loss is the total probe heat (watt) per (MV/m) 2 assuming 12µΩ surface resistance (R s ) and 3.8mT/(MV/m) equator magnetic field. The total loss in the last column in the spreadsheet is obtained by: 2 3.8mT 2 W loss = ½R s ( H ds)( ), 12.0A/m is the equator magnetic field when total 12.0A/ m H 2 ds is calculated. 6
8 Fig. 9 The transmission coefficient vs. frequency Table 1 lists the actual tip field ratio and the corresponding Q ext. The transmission S 12 is shown in Figure 9. One can see that tip 2 has lower transmission coefficient, which is due to the small tip area. The 10dB loss implies the potential 10 times higher Q ext for HOM damping. When the tip 1 is pulled out 20mil more, the surface magnetic field drops a little, while the transmission coefficient becomes 5dB lower. From Figure 9, the HOM s 1.82GHz peak shows higher Q ext. Fig. 10 The TM010 mode Q ext decreases when notch gap increases for Tip 1. 7
9 Fig. 11 The HOM Q ext vs. the tip magnetic field for Tip 1. For standard tip 1, when the notch gap was increased to detune the notch frequency as shown in Figure 10, the tip surface magnetic field did drop, but not low enough (Figure 11). The HOM external Q listed in Figure 10 and 11 is for a single cell cavity. For a 7- cell cavity, a factor of 7 should be applied to the TM010 mode Q ext. (a) (b) Fig. 12 The heat loss versus temperature: Tip 1 under different HOM tuning condition (a), Tip 1,2,3 with 30 mil probe gap and Tip 1 with 50 mil probe gap (b). 8
10 From the numbers listed in table 1, the overall heat losses on the tip for a 20 MV/m cavity field under different temperatures were plotted in Figure 12. Here the surface resistance for niobium is calculated as the function of the surface temperature by the BCS theory. It shows that the proper thermal optimization may be more efficient compared to the geometric optimization. 4. Conclusion The simulations results show that the notch detuning has only weak effect. The Tip 2 and the Tip 1 in a larger gap sacrifice the HOM damping, but the decrease of the surface magnetic field was not significant. The Tip 3 that maintains the same HOM damping by the same tip head size did not show an elevated tip magnetic field. The relative small surface area on the probe tip makes it the best option, yet not with dramatic improvement. Because the tip heat loss increases exponentially when tip temperature increases, the thermal properties of the probe and feedthrough are most important. 5. Acknowledgment The three tip geometries were proposed by C. Reece and Co. during the HOM meeting in August 12, We would like to thank the team of G. Ciovati, E. Daly, T. Elliott, W. Funk, P. Kneisel J. Mammosse, B. Manus, J. Ozelis, L. Phillips, J. Preble and T. Rothgeb for their assistance. 9
11 6. Appendix A The dimensions of Tip 3 used in HFSS computation. 10
SUPERCONDUCTING PROTOTYPE CAVITIES FOR THE SPALLATION NEUTRON SOURCE (SNS) PROJECT *
SUPERCONDUCTING PROTOTYPE CAVITIES FOR THE SPALLATION NEUTRON SOURCE (SNS) PROJECT * G. Ciovati, P. Kneisel, J. Brawley, R. Bundy, I. Campisi, K. Davis, K. Macha, D. Machie, J. Mammosser, S. Morgan, R.
More informationHOM/LOM Coupler Study for the ILC Crab Cavity*
SLAC-PUB-1249 April 27 HOM/LOM Coupler Study for the ILC Crab Cavity* L. Xiao, Z. Li, K. Ko, SLAC, Menlo Park, CA9425, U.S.A Abstract The FNAL 9-cell 3.9GHz deflecting mode cavity designed for the CKM
More informationExperience with 3.9 GHz cavity HOM couplers
Cornell University, October 11-13, 2010 Experience with 3.9 GHz cavity HOM couplers T. Khabiboulline, N. Solyak, FNAL. 3.9 GHz cavity general parameters Third harmonic cavity (3.9GHz) was proposed to compensate
More informationFundamental mode rejection in SOLEIL dipole HOM couplers
Fundamental mode rejection in SOLEIL dipole HOM couplers G. Devanz, DSM/DAPNIA/SACM, CEA/Saclay, 91191 Gif-sur-Yvette 14th June 2004 1 Introduction The SOLEIL superconducting accelerating cavity is a heavily
More informationA 3 GHz SRF reduced-β Cavity for the S-DALINAC
A 3 GHz SRF reduced-β Cavity for the S-DALINAC D. Bazyl*, W.F.O. Müller, H. De Gersem Gefördert durch die DFG im Rahmen des GRK 2128 20.11.2018 M.Sc. Dmitry Bazyl TU Darmstadt TEMF Upgrade of the Capture
More informationReview of New Shapes for Higher Gradients
Review of New Shapes for Higher Gradients Rong-Li Geng LEPP, Cornell University Rong-Li Geng SRF2005, July 10-15, 2005 1 1 TeV 800GeV 500GeV ILC(TESLA type) energy reach Rapid advances in single-cell cavities
More informationThe HOM measurement of a TESLA cavity (Z84) for HOM-BPM and cavity alignment
The HOM measurement of a TESLA cavity (Z84) for HOM-BPM and cavity alignment Ken.Watanabe:GUAS/AS (KEK) : presenter Hitoshi.Hayano, Shuichi.Noguchi, Eiji.Kako, Toshio.Shishido (KEK) Joint DESY and University
More informationCOUPLER DESIGN CONSIDERATIONS FOR THE ILC CRAB CAVITY
COUPLER DESIGN CONSIDERATIONS FOR THE ILC CRAB CAVITY C. Beard 1), G. Burt 2), A. C. Dexter 2), P. Goudket 1), P. A. McIntosh 1), E. Wooldridge 1) 1) ASTeC, Daresbury laboratory, Warrington, Cheshire,
More informationHigh Power Couplers for TTF - FEL
High Power Couplers for TTF - FEL 1. Requirements for High Power Couplers on superconducting Cavities 2. Characteristics of pulsed couplers 3. Standing wave pattern in the coaxial coupler line 4. Advantages
More informationTHE MULTIPACTING STUDY OF NIOBIUM SPUTTERED HIGH-BETA QUARTER-WAVE RESONATORS FOR HIE-ISOLDE
THE MULTIPACTING STUDY OF NIOBIUM SPUTTERED HIGH-BETA QUARTER-WAVE RESONATORS FOR HIE-ISOLDE P. Zhang and W. Venturini Delsolaro CERN, Geneva, Switzerland Abstract Superconducting Quarter-Wave Resonators
More informationCAGE CAVITY: A LOW COST, HIGH PERFORMANCE SRF ACCELERATING STRUCTURE*
CAGE CAVITY: A LOW COST, HIGH PERFORMANCE SRF ACCELERATING STRUCTURE* J. Noonan, T.L. Smith, M. Virgo, G.J. Waldsmidt, Argonne National Laboratory J.W. Lewellen, Los Alamos National Laboratory Abstract
More informationHOM COUPLER ALTERATIONS FOR THE LHC DQW CRAB CAVITY
HOM COUPLER ALTERATIONS FOR THE LHC DQW CRAB CAVITY J. A. Mitchell 1, 2, G. Burt 2, N. Shipman 1, 2, Lancaster University, Lancaster, UK B. Xiao, S.Verdú-Andrés, Q. Wu, BNL, Upton, NY 11973, USA R. Calaga,
More informationNew SLED 3 system for Multi-mega Watt RF compressor. Chen Xu, Juwen Wang, Sami Tantawi
New SLED 3 system for Multi-mega Watt RF compressor Chen Xu, Juwen Wang, Sami Tantawi SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94309, USA Electronic address: chenxu@slac.stanford.edu
More informationThe transition for the Elettra Input Power Coupler to the standard WR1800
The transition for the Elettra Input Power Coupler to the standard WR1800 Cristina Pasotti, Mauro Bocciai, Luca Bortolossi, Alessandro Fabris, Marco Ottobretti, Mauro Rinaldi Alessio Turchet Sincrotrone
More informationThird Harmonic Cavity Status
Third Harmonic Cavity Status General parameters Cavity design Main coupler calculation HOM analysis and HOM coupler design Lorentz Forces and Stress analysis Summary General parameters Third harmonic cavity
More informationMain Injector Cavity Simulation and Optimization for Project X
Main Injector Cavity Simulation and Optimization for Project X Liling Xiao Advanced Computations Group Beam Physics Department Accelerator Research Division Status Meeting, April 7, 2011 Outline Background
More informationResonant Excitation of High Order Modes in the 3.9 GHz Cavity of LCLS-II Linac
Resonant Excitation of High Order Modes in the 3.9 GHz Cavity of LCLS-II Linac LCLS-II TN-16-05 9/12/2016 A. Lunin, T. Khabiboulline, N. Solyak, A. Sukhanov, V. Yakovlev April 10, 2017 LCLSII-TN-16-06
More informationCONICAL HALF-WAVE RESONATOR INVESTIGATIONS
CONICAL HALF-WAVE RESONATOR INVESTIGATIONS E. Zaplatin, Forschungszentrum Juelich, Germany Abstract In the low energy part of accelerators the magnets usually alternate accelerating cavities. For these
More informationSTATUS OF THE ILC CRAB CAVITY DEVELOPMENT
STATUS OF THE ILC CRAB CAVITY DEVELOPMENT SLAC-PUB-4645 G. Burt, A. Dexter, Cockcroft Institute, Lancaster University, LA 4YR, UK C. Beard, P. Goudket, P. McIntosh, ASTeC, STFC, Daresbury laboratories,
More informationHigh Power, Magnet-free, Waveguide Based Circulator Using Angular-Momentum Biasing of a Resonant Ring
SLAC-R-1080 High Power, Magnet-free, Waveguide Based Circulator Using Angular-Momentum Biasing of a Resonant Ring Jeffrey Neilson and Emilio Nanni August 18, 2017 Prepared for Calabazas Creek Research,
More informationHigh Order Modes Survey and Mitigation of the CEBAF C100 Cryomodules
Available online at www.sciencedirect.com ScienceDirect Physics Procedia (2015) 000 000 www.elsevier.com/locate/procedia ICFA mini Workshop on High Order Modes in Superconducting Cavities, HOMSC14 High
More informationInfluences of a Beam-Pipe Discontinuity on the Signals of a Nearby Beam Position Monitor (BPM)
Internal Report DESY M 1-2 May 21 Influences of a Beam-Pipe Discontinuity on the Signals of a Nearby Beam Position Monitor (BPM) A.K. Bandyopadhyay, A. Joestingmeier, A.S. Omar, R. Wanzenberg Deutsches
More informationFAST RF KICKER DESIGN
FAST RF KICKER DESIGN David Alesini LNF-INFN, Frascati, Rome, Italy ICFA Mini-Workshop on Deflecting/Crabbing Cavity Applications in Accelerators, Shanghai, April 23-25, 2008 FAST STRIPLINE INJECTION KICKERS
More informationAdvanced Meshing Techniques
Advanced Meshing Techniques Ansoft High Frequency Structure Simulator v10 Training Seminar P-1 Overview Initial Mesh True Surface Approximation Surface Approximation Operations Lambda Refinement Seeding
More informationSummary of the cryogenic rf tests of a seamless Nb-Cu 2-cell cavity
Summary of the cryogenic rf tests of a seamless Nb-Cu 2-cell cavity G. Ciovati, P. Kneisel TJNAF, Newort News VA 23606 USA W. Singer, J. Sekutowicz DESY, Hamburg, 22603 Hamburg, Germany 1. Introduction
More informationALMA MEMO #360 Design of Sideband Separation SIS Mixer for 3 mm Band
ALMA MEMO #360 Design of Sideband Separation SIS Mixer for 3 mm Band V. Vassilev and V. Belitsky Onsala Space Observatory, Chalmers University of Technology ABSTRACT As a part of Onsala development of
More informationACHIEVEMENT OF ULTRA-HIGH QUALITY FACTOR IN PROTOTYPE CRYOMODULE FOR LCLS-II
ACHIEVEMENT OF ULTRA-HIGH QUALITY FACTOR IN PROTOTYPE CRYOMODULE FOR LCLS-II G. Wu 1, A. Grassellino, E. Harms, N. Solyak, A. Romanenko, C. Ginsburg, R. Stanek Fermi National Accelerator Laboratory, Batavia,
More informationSTATE OF THE ART IN EM FIELD COMPUTATION*
SLAC-PUB-12020 August 2006 STATE OF THE ART IN EM FIELD COMPUTATION* C. Ng, V. Akcelik, A. Candel, S. Chen, N. Folwell, L. Ge, A. Guetz, H. Jiang, A. Kabel, L.-Q. Lee, Z. Li, E. Prudencio, G. Schussman,
More informationThe shunt capacitor is the critical element
Accurate Feedthrough Capacitor Measurements at High Frequencies Critical for Component Evaluation and High Current Design A shielded measurement chamber allows accurate assessment and modeling of low pass
More informationThird Harmonic Superconducting passive cavities in ELETTRA and SLS
RF superconductivity application to synchrotron radiation light sources Third Harmonic Superconducting passive cavities in ELETTRA and SLS 2 cryomodules (one per machine) with 2 Nb/Cu cavities at 1.5 GHz
More informationSNS CRYOMODULE PERFORMANCE*
SNS CRYOMODULE PERFORMANCE* J. Preble*, I. E. Campisi, E. Daly, G. K. Davis, J. R. Delayen, M. Drury, C. Grenoble, J. Hogan, L. King, P. Kneisel, J. Mammosser, T. Powers, M. Stirbet, H. Wang, T. Whitlatch,
More informationProject X Cavity RF and mechanical design. T. Khabiboulline, FNAL/TD/SRF
Project X Cavity RF and mechanical design T. Khabiboulline, FNAL/TD/SRF TTC meeting on CW-SRF, 2013 Project X Cavity RF and mechanical design T 1 High ß Low ß 0.5 HWR SSR1 SSR2 0 1 10 100 1 10 3 1 10 4
More informationStatus of the HOM Damped Cavity Project
Status of the HOM Damped Cavity Project E. Weihreter / BESSY for the HOM Damped Cavity Collaboration BESSY, Daresbury Lab, DELTA, MaxLab, NTHU Project funded by the EC under contract HPRI-CT-1999-50011
More informationLOW BETA CAVITY DEVELOPMENT FOR AN ATLAS INTENSITY UPGRADE
LOW BETA CAVITY DEVELOPMENT FOR AN ATLAS INTENSITY UPGRADE M. P. Kelly, Z. A. Conway, S. M. Gerbick, M. Kedzie, T. C. Reid, R. C. Murphy, B. Mustapha, S.H. Kim, P. N. Ostroumov, Argonne National Laboratory,
More information3.9 GHz work at Fermilab
3.9 GHz work at Fermilab + CKM 13-cell cavity Engineering and designing W.-D. Moeller Desy, MHF-sl Protocol of the meeting about 3 rd harmonic cavities during the TESLA collaboration meeting at DESY on
More informationCEBAF waveguide absorbers. R. Rimmer for JLab SRF Institute
CEBAF waveguide absorbers R. Rimmer for JLab SRF Institute Outline Original CEBAF HOM absorbers Modified CEBAF loads for FEL New materials for replacement loads High power loads for next generation FELs
More information13.56MHz Antennas APPLICATION-NOTE. OBID i-scan. Construction and tuning of 13.56MHz antennas for Reader power levels up to 1W
OBID i-scan APPLICATION-NOTE 13.56MHz Antennas Construction and tuning of 13.56MHz antennas for Reader power levels up to 1W final public (B) 2003-01-15 N20901-2e-ID-B.doc Note Copyright 2002 by FEIG ELECTRONIC
More informationREVIEW OF HIGH POWER CW COUPLERS FOR SC CAVITIES. S. Belomestnykh
REVIEW OF HIGH POWER CW COUPLERS FOR SC CAVITIES S. Belomestnykh HPC workshop JLAB, 30 October 2002 Introduction Many aspects of the high-power coupler design, fabrication, preparation, conditioning, integration
More informationCHAPTER 2 MICROSTRIP REFLECTARRAY ANTENNA AND PERFORMANCE EVALUATION
43 CHAPTER 2 MICROSTRIP REFLECTARRAY ANTENNA AND PERFORMANCE EVALUATION 2.1 INTRODUCTION This work begins with design of reflectarrays with conventional patches as unit cells for operation at Ku Band in
More informationDesign and RF Measurements of an X-band Accelerating Structure for the Sparc Project
Design and RF Measurements of an X-band Accelerating Structure for the Sparc Project INFN-LNF ; UNIVERSITY OF ROME LA SAPIENZA ; INFN - MI Presented by BRUNO SPATARO Erice, Sicily, October 9-14; 2005 SALAF
More informationCALCULATIONS FOR RF CAVITIES WITH DISSIPATIVE MATERIAL*
CALCULATIONS FOR RF CAVITIES WITH DISSIPATIVE MATERIAL* F. Marhauser # Thomas Jefferson National Accelerator Facility, Newport News, VA 23606, U.S.A. Abstract For the design of RF devices like accelerating
More informationElectromagnetic, Thermal and Structural Analysis of the LUX Photoinjector Cavity using ANSYS. Steve Virostek Lawrence Berkeley National Lab
Electromagnetic, Thermal and Structural Analysis of the LUX Photoinjector Cavity using ANSYS Steve Virostek Lawrence Berkeley National Lab 13 December 2004 Photoinjector Background The proposed LBNL LUX
More informationHOM Couplers at DESY Jacek Sekutowicz** 2000 Hamburg 52, West-Germany
ntroduction HOM Couplers at DESY Jacek Sekutowicz** DESY, MHF, NotkestraBe 85 2000 Hamburg 52, West-Germany UiMEL computation and beadpull measurements showed that a 4-cell, 500 MHz HERA cavity has five
More informationAmateur Extra Manual Chapter 9.4 Transmission Lines
9.4 TRANSMISSION LINES (page 9-31) WAVELENGTH IN A FEED LINE (page 9-31) VELOCITY OF PROPAGATION (page 9-32) Speed of Wave in a Transmission Line VF = Velocity Factor = Speed of Light in a Vacuum Question
More informationSuperstructures; First Cold Test and Future Applications
Superstructures; First Cold Test and Future Applications DESY: C. Albrecht, V. Ayvazyan, R. Bandelmann, T. Büttner, P. Castro, S. Choroba, J. Eschke, B. Faatz, A. Gössel, K. Honkavaara, B. Horst, J. Iversen,
More informationCOMPACT SLOT ANTENNA WITH EBG FEEDING LINE FOR WLAN APPLICATIONS
Progress In Electromagnetics Research C, Vol. 10, 87 99, 2009 COMPACT SLOT ANTENNA WITH EBG FEEDING LINE FOR WLAN APPLICATIONS A. Danideh Department of Electrical Engineering Islamic Azad University (IAU),
More informationCoupler Electromagnetic Design
Coupler Electromagnetic Design HPC Workshop, TJNAF October 30 November 1, 2002 Yoon Kang Spallation Neutron Source Oak Ridge National Laboratory Contents Fundamental Power Coupler Design Consideration
More information3.9 GHz Deflecting Mode Cavity
3.9 GHz Deflecting Mode Cavity Timothy W. Koeth July 12, 2005 History of 3.9 GHz DMC Cavity Simulations The Other Modes concern and modeling R/Q Wake Field Simulations Design: OM couplers Testing: Vertical
More informationCST MWS simulation of the SARAF RFQ 1.5 MeV/nucleon proton/deuteron accelerator
CST MWS simulation of the SARAF RFQ 1.5 MeV/nucleon proton/deuteron accelerator Jacob Rodnizki SARAF Soreq NRC APril 19-21 th, 2010 Outline 1. SARAF accelerator 2. Presentation of the four rods RFQ 3.
More informationPractical Design Considerations for Dense, High-Speed, Differential Stripline PCB Routing Related to Bends, Meanders and Jog-outs
Practical Design Considerations for Dense, High-Speed, Differential Stripline PCB Routing Related to Bends, Meanders and Jog-outs AUTHORS Michael J. Degerstrom, Mayo Clinic degerstrom.michael@mayo.edu
More informationCLIC Power Extraction and Transfer Structure. (2004)
CLIC Power Extraction and Transfer Structure. (24) CLIC linac subunit layout: CLIC accelerating Structure (HDS) Main beam 3 GHz, 2 MW per structure Drive beam (64 A) CLIC Power Extraction and Transfer
More informationA MODIFIED FRACTAL RECTANGULAR CURVE DIELECTRIC RESONATOR ANTENNA FOR WIMAX APPLICATION
Progress In Electromagnetics Research C, Vol. 12, 37 51, 2010 A MODIFIED FRACTAL RECTANGULAR CURVE DIELECTRIC RESONATOR ANTENNA FOR WIMAX APPLICATION R. K. Gangwar and S. P. Singh Department of Electronics
More informationLatest Developments in Superconducting RF Structures for beta=1 Particle Acceleration
Latest Developments in Superconducting RF Structures for beta=1 Particle Acceleration Peter Kneisel Jefferson Lab Newport News, Virginia, USA June 28, 2006 EPAC 2006, Edinburgh 1 Outline Challenges of
More informationLow-Level RF. S. Simrock, DESY. MAC mtg, May 05 Stefan Simrock DESY
Low-Level RF S. Simrock, DESY Outline Scope of LLRF System Work Breakdown for XFEL LLRF Design for the VUV-FEL Cost, Personpower and Schedule RF Systems for XFEL RF Gun Injector 3rd harmonic cavity Main
More informationSchematic-Level Transmission Line Models for the Pyramid Probe
Schematic-Level Transmission Line Models for the Pyramid Probe Abstract Cascade Microtech s Pyramid Probe enables customers to perform production-grade, on-die, full-speed test of RF circuits for Known-Good
More informationT24_vg1.8_disk. 11WNSDVG1.8 CLIC_G GHz measurements versus simulations. A. Grudiev CERN
T24_vg1.8_disk 11WNSDVG1.8 CLIC_G un-damped @ 11.424 GHz measurements versus simulations A. Grudiev CERN 1.7.29 Acknowledgements CERN: M. Gerbaux R. Zennaro A. Olyunin W. Wuensch SLAC: Z. Li First cell
More informationCHAPTER 4. Practical Design
CHAPTER 4 Practical Design The results in Chapter 3 indicate that the 2-D CCS TL can be used to synthesize a wider range of characteristic impedance, flatten propagation characteristics, and place passive
More informationMicrowave Cancer Therapy
Page 1 of 9 RF and Microwave Models : Microwave Cancer Therapy Microwave Cancer Therapy Electromagnetic heating appears in a wide range of engineering problems and is ideally suited for modeling in COMSOL
More informationHigh-Power Directional Couplers with Excellent Performance That You Can Build
High-Power Directional Couplers with Excellent Performance That You Can Build Paul Wade W1GHZ 2010 w1ghz@arrl.net A directional coupler is used to sample the RF energy travelling in a transmission line
More informationEE 3324 Electromagnetics Laboratory
EE 3324 Electromagnetics Laboratory Experiment #10 Microstrip Circuits and Measurements 1. Objective The objective of Experiment #8 is to investigate the application of microstrip technology. A precision
More informationLORENTZ FORCE DETUNING ANALYSIS OF THE SPALLATION NEUTRON SOURCE (SNS) ACCELERATING CAVITIES *
LORENTZ FORCE DETUNING ANALYSIS OF THE SPALLATION NEUTRON SOURCE (SNS) ACCELERATING CAVITIES * R. Mitchell, K. Matsumoto, Los Alamos National Lab, Los Alamos, NM 87545, USA G. Ciovati, K. Davis, K. Macha,
More informationQUARTER WAVE COAXIAL LINE CAVITY FOR NEW DELHI LINAC BOOSTER*
QUARTER WAVE COAXIAL LINE CAVITY FOR NEW DELHI LINAC BOOSTER* P.N. Prakash and A.Roy Nuclear Science Centre, P.O.Box 10502, New Delhi 110 067, INDIA and K.W.Shepard Physics Division, Argonne National Laboratory,
More informationCHAPTER 5 PRINTED FLARED DIPOLE ANTENNA
CHAPTER 5 PRINTED FLARED DIPOLE ANTENNA 5.1 INTRODUCTION This chapter deals with the design of L-band printed dipole antenna (operating frequency of 1060 MHz). A study is carried out to obtain 40 % impedance
More informationReport of working group 5
Report of working group 5 Materials Cavity design Cavity Fabrication Preparatioin & Testing Power coupler HOM coupler Beam line absorber Tuner Fundamental R&D items Most important R&D items 500 GeV parameters
More informationFrank Marhauser Kai Tian. November, Jefferson Laboratory Jefferson Avenue VA, 23606
JLAB-TN-09-61 Optimization of the Cryomodule Cold-to-Warm Transitions and the VTA QA Test Configuration for CEBAF Upgrade Cavities with Regard to Critical HOMs above Cutoff Frank Marhauser Kai Tian November,
More informationWelcome to AntennaSelect Volume 1 August 2013
Welcome to AntennaSelect Volume 1 August 2013 This is the first issue of our new periodic newsletter, AntennaSelect. AntennaSelect will feature informative articles about antennas and antenna technology,
More informationRF Design of Normal Conducting Deflecting Cavity
RF Design of Normal Conducting Deflecting Cavity Valery Dolgashev (SLAC), Geoff Waldschmidt, Ali Nassiri (Argonne National Laboratory, Advanced Photon Source) 48th ICFA Advanced Beam Dynamics Workshop
More informationFREQUENCY RESPONSE OF R, L AND C ELEMENTS
FREQUENCY RESPONSE OF R, L AND C ELEMENTS Marking scheme : Methods & diagrams : 3 Graph plotting : - Tables & analysis : 2 Questions & discussion : 3 Performance : 2 Aim: This experiment will investigate
More informationThe Effects of PCB Fabrication on High-Frequency Electrical Performance
The Effects of PCB Fabrication on High-Frequency Electrical Performance John Coonrod, Rogers Corporation Advanced Circuit Materials Division Achieving optimum high-frequency printed-circuit-board (PCB)
More informationRF design studies of 1300 MHz CW buncher for European X-FEL. Shankar Lal PITZ DESY-Zeuthen
RF design studies of 1300 MHz CW buncher for European X-FEL Shankar Lal PITZ DESY-Zeuthen Outline Introduction Buncher design: Literature survey RF design of two-cell buncher: First design Two- cell buncher:
More informationLowpass Filters. Microwave Filter Design. Chp5. Lowpass Filters. Prof. Tzong-Lin Wu. Department of Electrical Engineering National Taiwan University
Microwave Filter Design Chp5. Lowpass Filters Prof. Tzong-Lin Wu Department of Electrical Engineering National Taiwan University Lowpass Filters Design steps Select an appropriate lowpass filter prototype
More informationMULTIPACTING IN THE CRAB CAVITY
MULTIPACTING IN TH CRAB CAVITY Y. Morita, K. Hara, K. Hosoyama, A. Kabe, Y. Kojima, H. Nakai, KK, 1-1, Oho, Tsukuba, Ibaraki 3-81, JAPAN Md. M. Rahman, K. Nakanishi, Graduate University for Advanced Studies,
More informationSeries CCRT-53S/CRT-53S Internal 50Ω Termination DC-26.5 GHz Failsafe SPDT Coaxial Switch
COAX SWITCHES Series CCRT-53S/CRT-53S PART NUMBER CCRT-53S CRT-53S DESCRIPTION Commercial Failsafe SPDT, DC-26.5GHz, Internal 5Ω Termination Elite Failsafe SPDT, DC-26.5GHz, Internal 5Ω Termination The
More informationToday I would like to present a short introduction to microstrip cross-coupled filter design. I will be using Sonnet em to analyze my planar circuit.
Today I would like to present a short introduction to microstrip cross-coupled filter design. I will be using Sonnet em to analyze my planar circuit. And I will be using our optimizer, EQR_OPT_MWO, in
More informationCavity development for TESLA
Cavity development for TESLA Lutz.Lilje@desy.de DESY -FDET- Cavity basics History: Limitations and solutions»material inclusions»weld defects»field emission»increased surface resistance at high field Performance
More informationABSTRACT 1 CEBAF UPGRADE CAVITY/CRYOMODULE
Energy Content (Normalized) SC Cavity Resonance Control System for the 12 GeV Upgrade Cavity: Requirements and Performance T. Plawski, T. Allison, R. Bachimanchi, D. Hardy, C. Hovater, Thomas Jefferson
More informationPredictions of LER-HER limits
Predictions of LER-HER limits PEP-II High Current Performance T. Mastorides, C. Rivetta, J.D. Fox, D. Van Winkle Accelerator Technology Research Div., SLAC 2e 34 Meeting, May 2, 27 Contents In this presentation
More information5.5 SNS Superconducting Linac
JP0150514 ICANS - XV 15 th Meeting of the International Collaboration on Advanced Neutron Sources November 6-9, 2000 Tsukuba, Japan Ronald M. Sundelin Jefferson Lab* 5.5 SNS Superconducting Linac 12000
More informationSIMULATIONS OF TRANSVERSE HIGHER ORDER DEFLECTING MODES IN THE MAIN LINACS OF ILC
SIMULATIONS OF TRANSVERSE HIGHER ORDER DEFLECTING MODES IN THE MAIN LINACS OF ILC C.J. Glasman, R.M. Jones, I. Shinton, G. Burt, The University of Manchester, Manchester M13 9PL, UK Cockcroft Institute
More informationChristopher Nantista ISG8 SLAC June 25, 2002
Christopher Nantista ISG8 SLAC June 25, 2002 TM 01 Mode Launcher Development Developed for upcoming traveling-wave single- structure tests as part of R&D to solve rf breakdown problem. Launchers to be
More informationSeries CCS-37S/CS-37S Miniature DC 18 GHz Failsafe TRANSFER Coaxial Switch
COAX SWITCHES Series CCS-37S/CS-37S PART NUMBER CCS-37S CS-37S DESCRIPTION Commercial Failsafe TRANSFER, DC-8GHz Elite Failsafe TRANSFER, DC-8GHz The CCS-37S/CS-37S is a long-life high performance transfer
More informationA tunable Si CMOS photonic multiplexer/de-multiplexer
A tunable Si CMOS photonic multiplexer/de-multiplexer OPTICS EXPRESS Published : 25 Feb 2010 MinJae Jung M.I.C.S Content 1. Introduction 2. CMOS photonic 1x4 Si ring multiplexer Principle of add/drop filter
More informationSeries CCRT-33S/CRT-33S Internal 50Ω Termination DC 18 GHz/DC-22 GHz Failsafe SPDT Coaxial Switch
COAX SWITCHES Series CCRT-33S/CRT-33S PART NUMBER CCRT-33S CRT-33S DESCRIPTION Commercial Failsafe SPDT, DC-18GHz, Internal 50Ω Termination Elite Failsafe SPDT, DC-22GHz, Internal 50Ω Termination The CCRT-33S/CRT-33S
More informationHigh Power Antenna Design for Lower Hybrid Current Drive in MST
High Power Antenna Design for Lower Hybrid Current Drive in MST M.A. Thomas, J.A. Goetz, M.C. Kaufman, S.P. Oliva University of WisconsinMadison J.B.O. Caughman, P.M. Ryan Oak Ridge National Laboratory
More informationSeries CCRT-33S/CRT-33S Internal 50Ω Termination DC 18 GHz/DC-22 GHz Latching SPDT Coaxial Switch
COAX SWITCHES Series CCRT-33S/CRT-33S PART NUMBER CCRT-33S CRT-33S DESCRIPTION Commercial Latching SPDT, DC-18GHz, Internal 50Ω Termination Elite Latching SPDT, DC-22GHz, Internal 50Ω Termination The CCRT-33S/CRT-33S
More informationCOMPARISON OF BUFFERED CHEMICAL POLISHED AND ELECTROPOLISHED 3.9 GHz CAVITIES*
COMPARISON OF BUFFERED CHEMICAL POLISHED AND ELECTROPOLISHED 3.9 GHz CAVITIES* H. Edwards #, C.A. Cooper, M. Ge, I.V. Gonin, E.R. Harms, T. N. Khabiboulline, N. Solyak Fermilab, Batavia IL, USA Abstract
More informationDQW HOM Coupler for LHC
DQW HOM Coupler for LHC J. A. Mitchell 1, 2 1 Engineering Department Lancaster University 2 BE-RF-BR Section CERN 03/07/2017 J. A. Mitchell (PhD Student) HL LHC UK Jul 17 03/07/2017 1 / 27 Outline 1 LHC
More informationOverview of ERL Projects: SRF Issues and Challenges. Matthias Liepe Cornell University
Overview of ERL Projects: SRF Issues and Challenges Matthias Liepe Cornell University Overview of ERL projects: SRF issues and challenges Slide 1 Outline Introduction: SRF for ERLs What makes it special
More informationThe Basics of Patch Antennas, Updated
The Basics of Patch Antennas, Updated By D. Orban and G.J.K. Moernaut, Orban Microwave Products www.orbanmicrowave.com Introduction This article introduces the basic concepts of patch antennas. We use
More informationSeries CCS-47/CS-47 High Power DC 12 GHz Failsafe TRANSFER Coaxial Switch
COAX SWITCHES Series CCS-47/CS-47 PART NUMBER CCS-47 CS-47 DESCRIPTION Commercial Failsafe TRANSFER, DC-GHz Elite Failsafe TRANSFER, DC-GHz The CCS-47/CS-47 is a long-life high performance transfer switch
More informationAdvance on High Power Couplers for SC Accelerators
Advance on High Power Couplers for SC Accelerators Eiji Kako (KEK, Japan) IAS conference at Hong Kong for High Energy Physics, 2017, January 23th Eiji KAKO (KEK, Japan) IAS at Hong Kong, 2017 Jan. 23 1
More informationAgilent 8761A/B Microwave Switches
Agilent 8761A/B Microwave Switches Product Overview Product Description The Agilent Technologies 8761A and 8761B are single-pole, double-throw coaxial switches with excellent electrical and mechanical
More informationSnowmass WG5: Superconducting Cavities and Couplers (Draft August 12, 2005 Rong-Li Geng) Topic 1: Cavity Shape
Snowmass WG5: Superconducting Cavities and Couplers (Draft August 12, 2005 Rong-Li Geng) Topic 1: Cavity Shape Overview The cavity shape determines the fundamental mode as well as the higher order modes
More informationSeries CCS-37K/CS-37K Miniature DC 36 GHz Latching TRANSFER Coaxial Switch
PART NUMBER CCS-37K CS-37K DESCRIPTION Commercial Latching TRANSFER, DC-36GHz Elite Latching TRANSFER, DC-36GHz The CCS-37K/CS-37K is a long-life high performance transfer switch designed for use in 50
More informationSeries CCT-58S/CT-58S Multi-Throw DC-26.5 GHz Normally Open Coaxial Switch
COAX SWITCHES Series CCT-58S/CT-58S PART NUMBER CCT-58S CT-58S DESCRIPTION Commercial Normally Open Multi-throw, DC-26.5GHz Elite Normally Open Multi-throw, DC-26.5GHz The CCT-58S/CT-58S is an internally
More informationDesign of the 352MHz, beta 0.50, Double- Spoke Cavity for ESS
Design of the 352MHz, beta 0.50, Double- Spoke Cavity for ESS Patricia DUCHESNE, Guillaume OLRY Sylvain BRAULT, Sébastien BOUSSON, Patxi DUTHIL, Denis REYNET Institut de Physique Nucléaire d Orsay SRF
More informationRENASCENCE * PERFORMANCE AND PROBLEMS ON FIRST TEST Feedthrough leaks sub 70 K. End group quenching
Proceedings of SRF27, Peking Univ., Beijing, China PERFORMANCE OF THE CEBAF PROTOTYPE CRYOMODULE RENASCENCE * C. E. Reece, E. F. Daly, G. K. Davis, M. Drury, W. R. Hicks, J. Preble, H. Wang # Jefferson
More informationO. Napoly LC02, SLAC, Feb. 5, Higher Order Modes Measurements
O. Napoly LC02, SLAC, Feb. 5, 2002 Higher Order Modes Measurements with Beam at the TTF Linac TTF Measurements A collective effort including most of Saclay, Orsay and DESY TTF physicists : S. Fartoukh,
More informationChapter 2. Modified Rectangular Patch Antenna with Truncated Corners. 2.1 Introduction of rectangular microstrip antenna
Chapter 2 Modified Rectangular Patch Antenna with Truncated Corners 2.1 Introduction of rectangular microstrip antenna 2.2 Design and analysis of rectangular microstrip patch antenna 2.3 Design of modified
More informationDesign and testing of a four rod crab cavity for HL-LHC
Design and testing of a four rod crab cavity for HL-LHC B. Hall, G. Burt, R. Apsimon, C. J. Lingwood, and A. Tutte Engineering Department, Lancaster University, LA1 4YW, UK and Cockcroft Institute, Daresbury
More information