Observation of Edge Plasma Fluctuations with a Fast Camera in Heliotron J

ZANG Linge (臧临阁); M. TAKEUCHI; N. NISHINO; T. MIZUUCHI; S. OHSHIMA; K. KASAJIMA; M. SHA; K. MUKAI; et al

doi:10.1088/1009-0630/15/3/04

Plasma Science and Technology > 2013 > 15(3): 213-216. > DOI: 10.1088/1009-0630/15/3/04

ZANG Linge (臧临阁), M. TAKEUCHI, N. NISHINO, T. MIZUUCHI, S. OHSHIMA, K. KASAJIMA, M. SHA, K. MUKAI, et al. Observation of Edge Plasma Fluctuations with a Fast Camera in Heliotron J[J]. Plasma Science and Technology, 2013, 15(3): 213-216. DOI: 10.1088/1009-0630/15/3/04

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Observation of Edge Plasma Fluctuations with a Fast Camera in Heliotron J

1 Graduate School of Energy Science, Kyoto University, Gokasho, Uji, 611-0011, Japan 2 Naka Fusion Institute, Japanese Atomic Energy Agency, Naka, 311-0193, Japan 3 Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima, 739-8527, Japan 4 Institute of Advanced Energy, Kyoto University, Gokasho, Uji, 611-0011, Japan

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Received Date: January 10, 2012

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Abstract

Abstract

fast video camera is verifi to be a powerful tool for observation of fiments/blobs near the last closed °ux surface (LCFS). In order to extract the fltuation component from the raw data of the fast camera, a pre-processing technique, sliding time window averaging subtraction (STWAS) has been developed to remove the background of slowly varying emission from the bulk plasma. By using this pre-processing technique, the fast camera data are analyzed. A method to identify the fiments in the pre-processed image is also discussed.
- edge plasma,
- fluctuation,
- fast camera,
- Heliotron J

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