Direct measurement of refracted trajectory of transmitting electron cyclotron beam through plasma on the Large Helical Device

Hiromi Takahashi; Shin Kubo; Takashi Shimozuma; Hiroe Igami; Yasuo Yoshimura; Satoshi Ito; Sakuji Kobayasi; Yoshinori Mizuno; Kohta Okada; Shuji Kamio; Takashi Mutoh; Masaki Osakabe; Kazunobu Nagasaki; Nikolai B. Marushchenko; Yuriy Turkin

doi:10.1051/epjconf/20158702019

All issues

Volume 87 (2015)

EPJ Web of Conferences, 87 (2015) 02019

Abstract

Open Access

Issue		EPJ Web of Conferences Volume 87, 2015 EC18 - 18^th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating


Article Number		02019
Number of page(s)		6
Section		ECRH and ECCD
DOI		https://doi.org/10.1051/epjconf/20158702019
Published online		12 March 2015

EPJ Web of Conferences 87, 02019 (2015)
https://doi.org/10.1051/epjconf/20158702019

Direct measurement of refracted trajectory of transmitting electron cyclotron beam through plasma on the Large Helical Device

Hiromi Takahashi¹^a, Shin Kubo¹, Takashi Shimozuma¹, Hiroe Igami¹, Yasuo Yoshimura¹, Satoshi Ito¹, Sakuji Kobayasi¹, Yoshinori Mizuno¹, Kohta Okada¹, Shuji Kamio¹, Takashi Mutoh¹, Masaki Osakabe¹, Kazunobu Nagasaki², Nikolai B. Marushchenko³ and Yuriy Turkin³ the LHD Experiment Group¹

¹ National Institute for Fusion Science, Toki 509-5292, Japan
² Institute of Advanced Energy, Kyoto Univ., Uji 611-0011, Japan
³ Max-Planck-Institut für Plasmaphysik, EURATOM Association, D-17491 Greifswald, Germany

^a Corresponding author: takahashi.hiromi@LHD.nifs.ac.jp

Published online: 12 March 2015

Abstract

The electron-cyclotron (EC) -beam refraction due to the presence of plasma was investigated in the Large Helical Device. The transmitted-EC-beam measurement system was constructed and the beam pattern on the opposite side of the irradiated surface was measured using an IR camera. Clear dependence of the EC-beam refraction on the electron density was observed and the beam shift in the toroidal direction showed good agreement with the ray-trace calculation of TRAVIS. The influence of the peripheral density profile and the thermal effect on the beam refraction were discussed.

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