Present Status of the Nd:YAG Thomson Scattering System Development for Time Evolution Measurement of Plasma Profile on Heliotron J

Takashi MINAMI; Shohei ARAI; Naoki KENMOCH; Hiroaki YASHIRO; Chihiro TAKAHASHI; Shinji KOBAYASHI; Tohru MIZUUCHI; Shinsuke OHSHIMA; Satoshi YAMAMOTO; Hiroyuki OKADA; Kazunobu NAGASAKI; et al

doi:10.1088/1009-0630/15/3/10

Plasma Science and Technology > 2013 > 15(3): 240-243. > DOI: 10.1088/1009-0630/15/3/10

Takashi MINAMI, Shohei ARAI, Naoki KENMOCH, Hiroaki YASHIRO, Chihiro TAKAHASHI, Shinji KOBAYASHI, Tohru MIZUUCHI, Shinsuke OHSHIMA, Satoshi YAMAMOTO, Hiroyuki OKADA, Kazunobu NAGASAKI, et al. Present Status of the Nd:YAG Thomson Scattering System Development for Time Evolution Measurement of Plasma Profile on Heliotron J[J]. Plasma Science and Technology, 2013, 15(3): 240-243. DOI: 10.1088/1009-0630/15/3/10

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Present Status of the Nd:YAG Thomson Scattering System Development for Time Evolution Measurement of Plasma Profile on Heliotron J

1 Institute of Advanced Energy, Kyoto University, Gokasho, Uji 611-0011, Japan 2 Graduate School of Energy Science, Kyoto University, Gokasho, Uji 611-0011, Japan 3 Pioneering Research Unit for Next Generation, Kyoto University, Gokasho, Uji 611-0011, Japan

Funds: supported by the Collaboration Program of the Laboratory for Complex Energy Processes, IAE, Kyoto University and the NIFS Collaborative Research Program (NIFS10KUHL030, NIFS09KUHL028, NIFS10KUHL033)

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Received Date: January 18, 2012

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Abstract

Abstract

A new high repetition rate Nd:YAG Thomson scattering system is developed for the Heliotron J helical device. A main purpose of installing the new system is the temporal evolution measurement of a plasma profile for improved confinement physics such as the edge transport barrier (H-mode) or the internal transport barrier of the helical plasma. The system has 25 spatial points with ~10 mm resolution. Two high repetition Nd:YAG lasers (> 550 mJ@ 50 Hz) realize the measurement of the time evolution of the plasma profile with ~10 ms time intervals. Scattered light is collected by a large concave mirror (D=800 mm, f/2.25) with a solid angle of ~100 mstr and transferred to interference filter polychromators by optical fiber bundles in a staircase form. The signal is amplified by newly designed fast preamplifiers with DC and AC output, which reduces the low frequency background noise. The signals are digitized with a multi-event QDC, fast gated integrators. The data acquisition is performed by a VME-based system operated by the CINOS.
- plasma diagnostic,
- Nd:YAG laser Thomson scattering measurement,
- plasma improved confinement

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