Experimental investigation of the ECRH stray radiation during the start-up phase in Wendelstein 7-X

Dmitry Moseev, Heinrich Laqua, Stefan Marsen, Torsten Stange, Harald Braune, Volker Erckmann, Florian Gellert, Johann Wilhelm Oosterbeek, Uwe Wenzel

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Abstract

Electron cyclotron resonance heating (ECRH) is the main heating mechanism in the Wendelstein 7-X stellarator (W7-X). W7-X is equipped with five absolutely calibrated sniffer probes that are installed in each of the five modules of the device. The sniffer probes monitor energy flux of unabsorbed ECRH radiation in the device and interlocks are fed with the sniffer probe signals. The stray radiation level in the device changes significantly during the start-up phase: Plasma is a strong microwave absorber and during its formation the stray radiation level in sniffer probes reduces by more than 95%. In this paper, we discuss the influence of neutral gas pressure and gyrotron power on plasma breakdown processes.

Original languageEnglish
Article number03002
Number of pages4
JournalEPJ Web of Conferences
Volume147
DOIs
Publication statusPublished - 24 Jul 2017
Event19th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, EC 2016 - Gandhinagar, Gujarat, India
Duration: 4 Apr 20167 Apr 2016

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