Observation of Plasma Behavior during the ECRH Injection by Using a High-Speed Camera in GAMMA 10

S. KigurePlasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan

Y. NakashimaPlasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan

N. NishinoGraduate school of Engineering, Hiroshima University Hiroshima, 739-8527, Japan

K. HosoiPlasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan

K. IchimuraPlasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan

H. TakedaPlasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan

S. KobayashiInstitute of Advanced Energy, Kyoto University, Gokasyo, Uji, 611 -0011, Japan

T. MizuuchiInstitute of Advanced Energy, Kyoto University, Gokasyo, Uji, 611 -0011, Japan

H. UedaPlasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan

S. TakahashiPlasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan

M. YoshikawaPlasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan

J. KohaguraPlasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan

R. MinamiPlasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan

T. KariyaPlasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan

M. SakamotoPlasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan

M. IchimuraPlasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan

T. ImaiPlasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan

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Abstract

A new high-speed camera (MEMRECAM GX-1, NAC Inc.) has been installed at the GAMMA 10 central-cell. This camera observes two directions through vertical and horizontal ports by using dual optical fiber bundles. This paper describes the results of 2-D image of visible emission observed from the central-cell plasma during Supersonic Molecular Beam injection (SMBI) in the C-ECRH experiments. Observational results showed that the instability of plasma light-emission on the central-limiter was suppressed during SMBI and the plasma sustainability increased along the SMBI plenum pressure. Relationship between plasma sustainability and power of C-ECRH and/or the quantity of SMBI is also investigated.

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Observation of Plasma Behavior during the ECRH Injection by Using a High-Speed Camera in GAMMA 10

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Observation of Plasma Behavior during the ECRH Injection by Using a High-Speed Camera in GAMMA 10

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