Observation of helical structure by imaging diagnostics in a low-aspect-ratio reversed field pinch

Takumi Onchi, Ryuya Ikezoe, Kensuke Oki, Akio Sanpei, Haruhiko Himura, Sadao Masamune, Nobuhiro Nishino, Haruhisa Koguchi

研究成果: Contribution to journalArticle査読

4 被引用数 (Scopus)


Study of helical structure has been in progress in shallow reversal reversed field pinch (RFP) plasmas in a lowaspect- ratio machine RELAX (R=a = 0:5 m/0.25 m, A = 2) by using visible light and soft-X-ray (SXR) imaging diagnostics. Simple helix and its toroidal rotation have been observed in tangential visible light images taken by a highspeed camera. Similar simple filament structures have also been observed in tangential images obtained by a pin-hole SXR camera assembled with Image-intensified charged coupled device (ICCD). The SXR experimental images have been compared with calculated tangential images using model profiles for emissivity to identify the plausible SXR emissivity profile. It has been found that a model profile of helical core having SXR emissivity 2-4 times higher than the background provides 2D SXR images in reasonable agreement with the experimental results. Time evolution of the SXR emissivity profile measured with a photodiode array has shown that the emissivity is the highest in the core region with a quasi-periodic oscillation of the peak position.

ジャーナルjournal of the physical society of japan
出版ステータス出版済み - 11 2011

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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