Fast visible imaging and edge turbulence analysis in QUEST

Santanu Banerjee, H. Zushi, N. Nishino, Y. Nagashima, K. Hanada, M. Ishiguro, T. Ryoukai, S. Tashima, T. Inoue, K. Nakamura, H. Idei, M. Hasegawa, A. Fujisawa, K. Matsuoka

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

A fast visible imaging system is installed on the spherical tokamak QUEST to study edge turbulence. The camera uses a complementary metal-oxide semiconductor detector with a maximum resolution of 1024 × 1024 at 7000 framess (fps) and can achieve 775 kfps at a resolution of 128 × 24. In this paper, we present the salient features of the system and its application to study edge turbulence in 8.2 GHz ECRH driven slab plasma, without plasma current. Vertical magnetic field (B z) topology is varied with three sets of poloidal field (PF) coils and the variation in the edge turbulence is investigated as a function of the B z strength and curvature. Fluctuation amplitude was highest for the shallow PF well. Cross-correlation coefficient shows distinct coherent mode along z direction at the steep density gradient region and it grows with the PF mirror ratio.

Original languageEnglish
Article number10E524
JournalReview of Scientific Instruments
Volume83
Issue number10
DOIs
Publication statusPublished - Oct 1 2012

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Turbulence
turbulence
Imaging techniques
plasma slabs
Plasmas
Semiconductor detectors
field coils
plasma currents
correlation coefficients
Imaging systems
cross correlation
CMOS
Mirrors
topology
Cameras
cameras
curvature
Topology
Magnetic fields
mirrors

All Science Journal Classification (ASJC) codes

  • Instrumentation

Cite this

Fast visible imaging and edge turbulence analysis in QUEST. / Banerjee, Santanu; Zushi, H.; Nishino, N.; Nagashima, Y.; Hanada, K.; Ishiguro, M.; Ryoukai, T.; Tashima, S.; Inoue, T.; Nakamura, K.; Idei, H.; Hasegawa, M.; Fujisawa, A.; Matsuoka, K.

In: Review of Scientific Instruments, Vol. 83, No. 10, 10E524, 01.10.2012.

Research output: Contribution to journalArticle

Banerjee, S, Zushi, H, Nishino, N, Nagashima, Y, Hanada, K, Ishiguro, M, Ryoukai, T, Tashima, S, Inoue, T, Nakamura, K, Idei, H, Hasegawa, M, Fujisawa, A & Matsuoka, K 2012, 'Fast visible imaging and edge turbulence analysis in QUEST', Review of Scientific Instruments, vol. 83, no. 10, 10E524. https://doi.org/10.1063/1.4739080
Banerjee, Santanu ; Zushi, H. ; Nishino, N. ; Nagashima, Y. ; Hanada, K. ; Ishiguro, M. ; Ryoukai, T. ; Tashima, S. ; Inoue, T. ; Nakamura, K. ; Idei, H. ; Hasegawa, M. ; Fujisawa, A. ; Matsuoka, K. / Fast visible imaging and edge turbulence analysis in QUEST. In: Review of Scientific Instruments. 2012 ; Vol. 83, No. 10.
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