Development of Heat Flow Measurement using Thermal Probe Method in Divertor Simulator MAP-II

Kiminori KURIHARA; Shinichiro KADO; Hiroto MATSUURA; Kyu-Sun CHUNG; Taiichi SHIKAMA; Yohei IIDA; Filippo SCOTTI; Yosuke KUWAHARA; Satoru TANAKA

doi:10.1585/pfr.2.S1082

Regular Articles

Development of Heat Flow Measurement using Thermal Probe Method in Divertor Simulator MAP-II

Kiminori KURIHARA, Shinichiro KADO, Hiroto MATSUURA, Kyu-Sun CHUNG, Taiichi SHIKAMA, Yohei IIDA, Filippo SCOTTI, Yosuke KUWAHARA, Satoru TANAKA

Author information

Kiminori KURIHARA
School of Engineering, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
Shinichiro KADO
High Temperature Plasma Center, The University of Tokyo, Kashiwa, Chiba 277-8568, Japan
Hiroto MATSUURA
Graduate School of Engineering, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
Kyu-Sun CHUNG
electric Probe Applications Laboratory (ePAL), Hanyang University, Seoul 133-791, Korea
Taiichi SHIKAMA
School of Engineering, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
Yohei IIDA
School of Engineering, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
Filippo SCOTTI
School of Engineering, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
Yosuke KUWAHARA
School of Engineering, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
Satoru TANAKA
School of Engineering, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan

Keywords: Thermal probe, Q-V characteristic, Time constant, Ion temperature, Divertor simulator MAP-II

JOURNAL FREE ACCESS

2007 Volume 2 Pages S1082

DOI https://doi.org/10.1585/pfr.2.S1082

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Abstract

The method of measuring heat flow Q as a function of the sheath potential V is investigated in order to improve the time response of the thermal probe method. We found that the time constant τ for reaching a steady state in thermal phenomena was 123 ± 18 s. The result of τ indicated that the applicable method for measuring the Q-V characteristic was biasing the thermal probe in a stepwise manner, and this was verified experimentally. Although there existed a V-dependent offset of the Q-V curve deduced from the temperature gradients against that calculated from the ion current, a procedure to deduce the ion temperature T_i is developed. The experimental error in T_i was too large, and was caused by the error in Q. Thus we have to improve the accuracy of the Q measurement.

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