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

doi:10.1051/epjconf/201714703002

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

Science and Technology of Nuclear Fusion

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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 language	English
Article number	03002
Number of pages	4
Journal	EPJ Web of Conferences
Volume	147
DOIs	https://doi.org/10.1051/epjconf/201714703002
Publication status	Published - 24 Jul 2017
Event	19th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, EC 2016 - Gandhinagar, Gujarat, India Duration: 4 Apr 2016 → 7 Apr 2016

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

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.",

author = "Dmitry Moseev and Heinrich Laqua and Stefan Marsen and Torsten Stange and Harald Braune and Volker Erckmann and Florian Gellert and Oosterbeek, {Johann Wilhelm} and Uwe Wenzel",

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doi = "10.1051/epjconf/201714703002",

language = "English",

volume = "147",

journal = "EPJ Web of Conferences",

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T1 - Experimental investigation of the ECRH stray radiation during the start-up phase in Wendelstein 7-X

AU - Moseev, Dmitry

AU - Laqua, Heinrich

AU - Marsen, Stefan

AU - Stange, Torsten

AU - Braune, Harald

AU - Erckmann, Volker

AU - Gellert, Florian

AU - Oosterbeek, Johann Wilhelm

AU - Wenzel, Uwe

PY - 2017/7/24

Y1 - 2017/7/24

N2 - 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.

AB - 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.

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U2 - 10.1051/epjconf/201714703002

DO - 10.1051/epjconf/201714703002

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SN - 2101-6275

VL - 147

JO - EPJ Web of Conferences

JF - EPJ Web of Conferences

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T2 - 19th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, EC 2016

Y2 - 4 April 2016 through 7 April 2016

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

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