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Title: First measurement of time evolution of electron temperature profiles with Nd:YAG Thomson scattering system on Heliotron J
Authors: Kenmochi, N.
Minami, T.
Takahashi, C.
Tei, S.
Mizuuchi, T.
Kobayashi, S.
Nagasaki, K.
Nakamura, Y.
Okada, H.
Kado, S.
Yamamoto, S.
Ohshima, S.
Konoshima, S.
Shi, N.
Zang, L.
Ohtani, Y.
Kasajima, K.
Sano, F.
Author's alias: 南, 貴司
Issue Date: Nov-2014
Publisher: AIP Publishing
Journal title: Review of Scientific Instruments
Volume: 85
Issue: 11
Thesis number: 11D819
Abstract: A Nd:YAG Thomson scattering system has been developed for Heliotron J. The system consists of two 550 mJ 50 Hz lasers, large collection optics, and 25 radial channel (∼1 cm spatial resolution) interference polychromators. This measurement system achieves a S/N ratio of ∼50 for low-density plasma (n [e] ∼ 0.5 × 10{19} m{−3}). A time evolution of electron temperature profiles was measured with this system for a high-intensity gas-puff (HIGP) fueling neutral-beam-injection plasma. The peripheral temperature of the higher-density phase after HIGP recovers to the low-density pre-HIGP level, suggesting that improving particle transport in the HIGP plasma may be possible.
Rights: © 2014 AIP Publishing LLC
DOI(Published Version): 10.1063/1.4890255
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