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

Autor:	V. Erckmann, U. Wenzel, H. Braune, F. Gellert, Torsten Stange, S. Marsen, Johann Wilhelm Oosterbeek, Dmitry Moseev, Heinrich P. Laqua
Přispěvatelé:	W7-X Team, Max Planck Institute for Plasma Physics, Max Planck Society
Jazyk:	angličtina
Rok vydání:	2017
Předmět:	Physics business.industry QC1-999 Electrical engineering Phase (waves) Energy flux Plasma Radiation 01 natural sciences Electron cyclotron resonance 010305 fluids & plasmas law.invention Optics law Gyrotron 0103 physical sciences Wendelstein 7-X 010306 general physics business Stellarator
Zdroj:	EPJ Web of Conferences, Vol 147, p 03002 (2017) EPJ Web of Conferences
Popis:	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.
Databáze:	OpenAIRE
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