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Initial Result of Successive SXR Imaging Measurement in Low-A RFP

Akio SANPEI, Kensuke OKI, Mitsuru NAKAMURA, Akio HIGASHI, Hidehiko MOTOI, Daisuke FUKAHORI, Haruhiko HIMURA, Sadao MASAMUNE, Satoshi OHDACHI¹⁾, Nobuhiro NISHINO²⁾, Takumi ONCHI³⁾ and Ryuya IKEZOE⁴⁾

Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan

1)

National Institute for Fusion Science, Oroshi-cho, Toki 509-5292, Japan

2)

Hiroshima University, Hiroshima 739-8527, Japan

3)

University of Saskatchewan, Saskatchewan S7N 5E2, Canada

4)

University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan

(Received 7 December 2010 / Accepted 7 April 2011 / Published 27 July 2011)

Abstract

A fast successive soft-X ray (SXR) imaging system where SXR camera and high-speed camera for the study of time evolution of magnetic islands has been constructed. A preliminary experimental result in which we observed tangential SXR images from quasi-periodic quasi-single helicity (QSH) state in low-aspect-ratio (low-A) reversed field pinch (RFP) is presented. We successfully obtained time evolution of SXR images from tangential port. By comparison obtained images with simulated images, we may conclude that the evolution of experimental SXR image suggests the rotating QSH RFP configuration. The filamentous configuration tends to be observed in QSH state rather than in multi-helicity (MH) state.

Copyright (c) 2011 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

RFP, soft-X ray (SXR), imaging, magnetic island, high-speed camera

DOI: 10.1585/pfr.6.2406096

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References

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This paper may be cited as follows:

Akio SANPEI, Kensuke OKI, Mitsuru NAKAMURA, Akio HIGASHI, Hidehiko MOTOI, Daisuke FUKAHORI, Haruhiko HIMURA, Sadao MASAMUNE, Satoshi OHDACHI, Nobuhiro NISHINO, Takumi ONCHI and Ryuya IKEZOE, Plasma Fusion Res. 6, 2406096 (2011).