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

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...

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Bibliographic Details
Main Authors: 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.
Format: Conference Proceeding
Language:English
Subjects:
Cyclotron resonance
Cyclotron resonance devices
Electron cyclotron resonance
Heating
Neutral gases
Plasma control
Steady state
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Summary: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.
ISSN:2100-014X
2101-6275
2100-014X
DOI:10.1051/epjconf/201818701003