Coupling and Heating Experiments Using Fast Wave Antenna with Back Faraday Shield on JFT-2M

Toshihide Ogawa; Mikio Saigusa; Hisato Kawashima; Sadayoshi Kanazawa

doi:dx.doi.org/10.13182/FST01-A11963467

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Coupling and Heating Experiments Using Fast Wave Antenna with Back Faraday Shield on JFT-2M

Toshihide Ogawa, Mikio Saigusa, Hisato Kawashima, Sadayoshi Kanazawa

Fusion Science and Technology / Volume 39 / Number 1T / January 2001 / Pages 305-308

Poster Presentations / dx.doi.org/10.13182/FST01-A11963467

Published:February 8, 2018

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A back Faraday shield is proposed for improving a cooling design of Faraday shield and better antenna-plasma coupling of a fast wave antenna. The radiofrequency properties of an antenna with the back Faraday shield have been investigated in the JFT-2M tokamak. The loading resistance of the antenna was significantly higher than that of an antenna using a conventional Faraday shield. The back Faraday shield antenna did not show adverse results for launching fast waves up to 550 kW of coupled power. The electron heating was observed by a soft X ray spectrum measurement increased by 0.35 keV during 250 kW of fast wave application.