EPJ Web of Conferences
Volume 87, 2015EC18 - 18th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating
|Number of page(s)||6|
|Section||ECRH and ECCD|
|Published online||12 March 2015|
Direct measurement of refracted trajectory of transmitting electron cyclotron beam through plasma on the Large Helical Device
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
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.
© Owned by the authors, published by EDP Sciences, 2015
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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