15-19 April 2018
Paradise Point Resort & Spa
America/Los_Angeles timezone

14.33 Loss Electron Diagnostic Systems for Measurements of High Intermittent Heat Flux in GAMMA 10 Tandem Mirror

19 Apr 2018, 10:30
2h 1m
Paradise Point Resort & Spa

Paradise Point Resort & Spa

1404 Vacation Rd, San Diego, CA 92109

Speakers

Ryutaro Minami (Plasma Research Center, University of Tsukuba) Tsuyoshi Kariya (Plasma Research Center, University of Tsukuba) Tsuyoshi Imai (Plasma Research Center, University of Tsukuba) Tomoharu Numakura (Plasma Research Center, University of Tsukuba) Satoshi Kajino (Plasma Research Center, University of Tsukuba) Maki Okada (Plasma Research Center, University of Tsukuba) Toshitaka Hojo (Plasma Research Center, University of Tsukuba) Fumiya Motoyoshi (Plasma Research Center, University of Tsukuba) Yoichi Endo (Plasma Research Center, University of Tsukuba) Yousuke Nakashima (Plasma Research Center, University of Tsukuba) Maki Okada (Plasma Research Center, University of Tsukuba)

Description

Electron cyclotron heating (ECH) power modulation experiments in GAMMA 10 tandem mirror have been started in order to generate and control the high heat flux and to make the ELM (edge localized mode) like intermittent heat load pattern for divertor simulation studies. Temporally and spatially resolved soft X-ray and end-loss-electron analyses of electron cyclotron heated plasmas are carried out by using a semiconductor detector array and an electrostatic energy analyzer in the GAMMA 10 tandem mirror. The flux and the energy spectrum of end loss electrons are measured by a multi-grid energy analyzer (loss electron diagnostics, LED). End loss electrons enter the analyzer through a small hole on an electrically floating end plate that is located in front of the end wall. The collector current of the analyzer corresponds to the electron current flowing into the end plate. In this paper, experimental results in ECH power modulation for control of high intermittent heat flux in GAMMA 10 tandem mirror by the use of these detectors for electron properties are reported.

Primary author

Ryutaro Minami (Plasma Research Center, University of Tsukuba)

Co-authors

Tsuyoshi Kariya (Plasma Research Center, University of Tsukuba) Tsuyoshi Imai (Plasma Research Center, University of Tsukuba) Tomoharu Numakura (Plasma Research Center, University of Tsukuba) Satoshi Kajino (Plasma Research Center, University of Tsukuba) Maki Okada (Plasma Research Center, University of Tsukuba) Toshitaka Hojo (Plasma Research Center, University of Tsukuba) Fumiya Motoyoshi (Plasma Research Center, University of Tsukuba) Yoichi Endo (Plasma Research Center, University of Tsukuba) Yousuke Nakashima (Plasma Research Center, University of Tsukuba) Maki Okada (Plasma Research Center, University of Tsukuba)

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