ECRH-Technology Development at Forschungszentrum Karlsruhe

 

G. Dammertz1a, R. Heidinger1b, B. Piosczyk1a, M. Thumm1a,2

 

1Forschungszentrum Karlsruhe, Association EURATOM-FZK,
aInstitut für Hochleistungsimpuls- und Mikrowellentechnik, bInstitut für Materialforschung I,
Postfach 3640, D-76021 Karlsruhe, Germany,

2Universität Karlsruhe, Institut für Höchstfrequenztechnik und Elektronik,

Kaiserstr. 12, D-76128 Karlsruhe, Germany

 

e-mail: guenter.dammertz@ihm.fzk.de; phone: (+49) 7247-82 41 60; fax: (+49) 7247 / 82 4874

 

 

The key areas of work in ECRH technology development at the Forschungszentrum Karlsruhe (FZK ) in close collaboration with other European Fusion Associations are :

a) RD in the field of high frequency (105-170 GHz), high power (1-2 MW), high efficiency ( about 50%), CW gyrotron oscillators for ITER

b) R&D in the field of high power (1-2 MW); CW, CVD-diamond vacuum windows for gyrotrons and ITER plasma torus

c) Development of the ECRH upper port plug for ITER

d) Development, installation, commissioning and test of the complete 10 MW, CW, ECH system for the stellarator W7-X at IPP Greifswald.

 

This paper summarizes the achievements in these fields and discusses future activities:

a) Coaxial cavity gyrotron: 2.2 MW output power, 28% efficiency, 1 ms pulse duration

                                               1.5 MW, 48%, 1 ms ( single stage depressed collector )           
                                           1.2 MW power level for 17 ms pulse duration

     Establishment of ITER Coax-Gyrotron Task Force with CRPP,

     Frequency step tunable gyrotron: 1-1.5 MW; 50% (SDC), 1ms

                                                                  105-170 GHz; slow tuning (minutes)

                                                                  132-147 GHz; fast tuning (seconds)

b) CVD-diamond window tests at 118-170 GHz at power levels from 0.3-1 MW with pulse duration up to 1300 s; Irradiation and overpressure tests

c) Establishment of ITER ECRH Upper Port Plug Task Force with FOM

d) Parameters of the W7-X prototype-gyrotron ( in collaboration with CRPP, Lausanne) :

                                             1 MW,      12 s, 50%

                                             0.92 MW, 55 s

                                             0.89 MW, 180 s ( limited by HV power supply)

                                             0.54 MW, 938 s

                                             0.26 MW, 1300s

    Transmission of quasi-optical multi-beam waveguide: > 90 % (collaboration with IPF, Stuttgart)