EPJ Web of Conferences (Jan 2018)

Concurrent operation of 10 gyrotrons at W7-X experience and improvement opportunities

  • Braune H.,
  • Brunner K.J.,
  • Laqua H.P.,
  • Marsen S.,
  • Moseev D.,
  • Noke F.,
  • Purps F.,
  • Schneider N.,
  • Schulz T.,
  • Stange T.,
  • Uhren P.,
  • Wilde F.,

DOI
https://doi.org/10.1051/epjconf/201818701003
Journal volume & issue
Vol. 187
p. 01003

Abstract

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At the stellarator Wendelstein 7-X (W7-X) Electron Cyclotron Resonance Heating (ECRH) is the main heating system for steady-state operation and was the only available heating system during the operation phase OP1.2a in 2017. The ECRH, equipped with 10 operational 140 GHz gyrotrons [1], was used for different tasks at W7-X such as wall conditioning, controlled plasma start-up from the neutral gas up to steady state plasma control and different heating scenarios such as X2-mode and O2-mode heating as well as current drive (ECCD). The operational experiences and improvement opportunities of the ECRH plant will be discussed.