Max-Planck-Institut für Plasmaphysik STATUS OF THE NEW ECRH SYSTEM FOR ASDEX UPGRADE D. Wagner, G.Grünwald, F.Leuterer, F.Monaco, M.Münich, H.Schütz, F.Ryter, R. Wilhelm, H.Zohm, T.Franke Max-Planck-Institut für Plasmaphysik, D-85748 Garching, Germany 1) G. Dammertz, 2) H. Heidinger, 1) K. Koppenburg, 1,3) M. Thumm Forschungszentrum Karlsruhe, 1) Institut für Hochleistungsimpuls- und Mikrowellentechnik, 2) Institut für Materialforschung I, D-76021 Karlsruhe, Germany 3) Universität Karlsruhe, Institut für Höchstfrequenztechnik und Elektronik, D-76128 Karlsruhe, Germany W. Kasparek, G. Gantenbein, H. Hailer Institut für Plasmaforschung, Universität Stuttgart, D-70569 Stuttgart, Germany G. Denisov, A. Litvak, V. Zapevalov Institute of Applied Physics, RAS, 603600 Nizhny Novgorod, Russia
Planned system parameters: power: 4 MW, provided by 4 gyrotrons pulse length: 10 sec frequency: 105 / 140 GHz as a 2-f-gyrotron 105 to 140 GHz as a step tunable gyrotron launcher: feedback controled deposition physics aims: heating and current drive, in particular for studies of advanced tokamak regime suppression of tearing modes control of transport and pressure profile The project is supported in part by Helmholtz Gemeinschaft HGF via a cooperation between IPP, FZK and FZJ
4 gyrotrons, 105-140 GHz, 1 MW, 10 sec 10 kv HV Power supply 70 kv 80 A HV A Crow bar Series tube Series tube Body modul. Body modul. GYCOM Gyrotron 1MW/10s GYCOM Gyrotron 1MW/10s 10 kv HV Power supply 70 kv 80 A HV B Crow bar Series tube Series tube Body modul. Body modul. GYCOM Gyrotron 1MW/10s GYCOM Gyrotron 1MW/10s
4 gyrotrons, 105-140 GHz, 1 MW, 10 sec cooling series tube cooling gyrotron LN2 LHe cooling gyrotron window cooling loads cooling calorim, load cooling torus window forward power measurement 70 kv steerable RF crow series MOU transm. torus bar modul. gyrotron box line window mirror plasma HV trafo body modulator HV trafo filament power supplies cryomagnet collector magnet gun magnet filament GIP mirrors + windows position control AUG trigger SIMATIC control + protection ECRH timer ECRH data aquisition AUG data aquis.
Gyrotron arrangement with central high power load
Gyrotron hall HE-11 lines MOU box Gyrotron socket basement: high voltage area
Electron beam radii and caustics for operating modes (Zapevalov et al.) Calculated field amplitude patterns at the gyrotron window 80mm a.) f=111.6 GHz, Gaussian mode content η G =95% b.) f=140 GHz, η G =96% We will choose 4 frequencies as our main operating modes
Measured beam at the output window (Zapevalov et al.) For each frequency the beam leaves the gyrotron in a slightly different direction This has to be corrected in the first two mirrors of the matching optics unit
Matching optics unit: - two phase correcting mirrrors, the second one with integrated directional coupler (one pair of mirrors for each frequency) - two broad band polariser mirrors - mirror for coupling into the HE11-line - switchable mirror for coupling into the central 1 MW / 10 sec load - switchable mirror for coupling into a 1 MW / 0.5 sec calorimeter load The mirrors are made of 40 mm thick copper without forced cooling
Polarizer mirrors must provide the desired polarization in the frequency range 105-140 GHz for the required angular range in ASDEX Upgrade experiments ( ± 35 in poloidal and toroidal direction) BROADBAND POLARIZERS
Matching optics unit to HE11 line from gyrotron central load load
HE11 transmission lines 87 mm i.d. broadband corrugated waveguide line at normal air pressure
ASDEX Upgrade torus hall (on top of the torus) ECRH-2 HE11- transm. lines ECRH-1 quasi optical transm. lines ECRH-1 HE11- transm. lines
AUG - sector 5, ECRH launcher plug-in toroidal steering poloidal steering
ECRH launcher drive concept: push rod drive target: mirror positioning 10 in 100 msec
ECRH launching mirrors in sector 5
x A poloidal angle variation of 10 in 100 msec has been achieved x = 23.5 mm => ϕ=32 deceleration phase 50 msec delayed switchoff 12 msec constant velocity motion acceleration phase 50 msec delayed response 12 msec start pulsed drive t
Tunable double disc window
power (%) 100 80 60 40 Reflection, d 1 =d 2 = 1.797 mm distance = 15 mm distance = 10 mm distance = 5 mm minimum Window reflection required Fabry-Perot resonances must be broad enough to include the frequency drift of the gyrotron maximum allowed distance between discs 20 5 Reflection 0 100 110 120 130 140 150 frequency (GHz) power (%) 4 3 2 distance = 15 mm distance = 10 mm distance = 5 mm 1 d 1 d 2 0 120.0 120.5 121.0 121.5 122.0 frequency (GHz)
New concept: direct cooling of one side of the disk Diamonds Effective cooling area is big Distance d between diamond disks could be sufficiently reduced Copper Cooling water d Cooling area
calorim. load switchable mirror length adjustment mitre bend with directional coupler
Time planning 2003 new launchers installed into the torus main parts of the transmission line mounted 2004 first set of two modulators installed and tested 2004 delivery and commissioning of 2 - f - gyrotron + 1 month calibrations delivery and commissioning of step tunable gyrotron + 2 months calibrations