Observation of second harmonic electron cyclotron resonance heating and current-drive transition during non-inductive plasma start-up experiment in QUEST

2021 ◽  
Author(s):  
Shinichiro Kojima ◽  
Kazuaki Hanada ◽  
Hiroshi Idei ◽  
Takumi Onchi ◽  
Ryuya Ikezoe ◽  
...  
Keyword(s):  
Cyclotron Resonance ◽  
Electron Cyclotron Resonance ◽  
Second Harmonic ◽  
Electron Cyclotron ◽  
Current Drive ◽  
Electron Cyclotron Resonance Heating ◽  
Start Up

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

2018 ◽  
Vol 187 ◽  
pp. 01003 ◽  
Author(s):  
H. Braune ◽  
K.J. Brunner ◽  
H.P. Laqua ◽  
S. Marsen ◽  
D. Moseev ◽  
...  
Keyword(s):  
Steady State ◽  
Cyclotron Resonance ◽  
Electron Cyclotron Resonance ◽  
Heating System ◽  
Current Drive ◽  
Electron Cyclotron Resonance Heating ◽  
Neutral Gas ◽  
Steady State Operation ◽  
Start Up ◽  
Operation Phase

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.

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