Design and initial result of time-resolved vertical soft x-ray imaging system in low-A RFP

Akio Sanpei, Kensuke Oki, Daisuke Fukahori, Kazuaki Deguchi, Seiya Nakaki, Kanae Nishimura, Haruhiko Himura, Sadao Masamune, Satoshi Ohdachi, Nobuhiro Nishino, Takumi Onchi

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Abstract

A time-resolved vertical soft X-ray (SXR) imaging system was constructed. To identify the structure of the magnetic island using the obtained SXR images, we calculated the two-dimensional (2-D) image expected from low-aspect-ratio (low-A) reversed field pinch (RFP) plasmas. The 2-D image was found to reflect the change in the radiation power caused by the magnetic island. A preliminary experimental result in which we observed vertical SXR images fromthe quasi-periodic quasi-single helicity (QSH) state in low-A RFP plasmas is presented. We successfully obtained the time evolution of SXR images from the vertical port. By comparing the observed images with simulated images, we found that the evolution of the experimental SXR image suggests a rotating helical configuration.

Original languageEnglish
Article number2402052
JournalPlasma and Fusion Research
Volume7
Issue numberSPL.ISS.1
DOIs
Publication statusPublished - Dec 1 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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    Sanpei, A., Oki, K., Fukahori, D., Deguchi, K., Nakaki, S., Nishimura, K., Himura, H., Masamune, S., Ohdachi, S., Nishino, N., & Onchi, T. (2012). Design and initial result of time-resolved vertical soft x-ray imaging system in low-A RFP. Plasma and Fusion Research, 7(SPL.ISS.1), [2402052]. https://doi.org/10.1585/pfr.7.2402052