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

doi:10.1063/1.4739080

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

Division of Nuclear Fusion Dynamics

Research output: Contribution to journal › Article › peer-review

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 language	English
Article number	10E524
Journal	Review of Scientific Instruments
Volume	83
Issue number	10
DOIs	https://doi.org/10.1063/1.4739080
Publication status	Published - Oct 2012

All Science Journal Classification (ASJC) codes

Instrumentation

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10.1063/1.4739080

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title = "Fast visible imaging and edge turbulence analysis in QUEST",

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.",

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

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T1 - Fast visible imaging and edge turbulence analysis in QUEST

AU - Banerjee, Santanu

AU - Zushi, H.

AU - Nishino, N.

AU - Nagashima, Y.

AU - Hanada, K.

AU - Ishiguro, M.

AU - Ryoukai, T.

AU - Tashima, S.

AU - Inoue, T.

AU - Nakamura, K.

AU - Idei, H.

AU - Hasegawa, M.

AU - Fujisawa, A.

AU - Matsuoka, K.

PY - 2012/10

Y1 - 2012/10

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AB - 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.

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Fast visible imaging and edge turbulence analysis in QUEST

Abstract

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