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Theoretical investigation on possible operation of a 140 GHz 1 MW gyrotron at 175 GHz for CTS plasma diagnostics at W7-X

W7-X Team; Krier, Laurent; Pagonakis, Ioannis Gr.; Avramidis, Konstantinos A.; Gantenbein, Gerd; Illy, Stefan; Jelonnek, John; Jin, Jianbo; Laqua, Heinrich Peter; Marek, Alexander; Moseev, Dmitry; Thumm, Manfred

Abstract (englisch):
Collective Thomson scattering is a common diagnostic technique for ion temperature measurements in experimental fusion plasma reactors.
Such a system was successfully installed and commissioned at the Wendelstein 7-X stellarator. For this purpose, a 140 GHz gyrotron of the
Electron Cyclotron Resonance Heating system was used as a source of the required probing millimeter (mm)-wave beam. However, accurate
measurements in the plasma core were not possible at this heating frequency due to the absorption of the mm-waves and the high electron
cyclotron emission background. To suppress these effects and to enhance the accuracy of the measurements, it is required to increase the frequency
of the probing beam. In this work, the possibility to operate the same gyrotron, which has its nominal operation at 140 GHz, at a
higher frequency is comprehensively investigated.

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DOI: 10.1063/5.0022151
Zugehörige Institution(en) am KIT Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 11.2020
Sprache Englisch
Identifikator ISSN: 1070-664X, 1089-7674
KITopen-ID: 1000126775
HGF-Programm 31.03.02 (POF III, LK 01) Plasma Heizsysteme
Erschienen in Physics of plasmas
Band 27
Heft 11
Seiten Art.-Nr.: 113107
Projektinformation EUROfusion (EU, H2020, 633053)
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
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