[Table of Contents]

Plasma and Fusion Research

Volume 2, S1082 (2007)

Regular Articles

Development of Heat Flow Measurement using Thermal Probe Method in Divertor Simulator MAP-II
Kiminori KURIHARA, Shinichiro KADO1), Hiroto MATSUURA2), Kyu-Sun CHUNG3), Taiichi SHIKAMA, Yohei IIDA, Filippo SCOTTI, Yosuke KUWAHARA and Satoru TANAKA
School of Engineering, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
1)
High Temperature Plasma Center, The University of Tokyo, Kashiwa, Chiba 277-8568, Japan
2)
Graduate School of Engineering, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
3)
electric Probe Applications Laboratory (ePAL), Hanyang University, Seoul 133-791, Korea
(Received 4 December 2006 / Accepted 5 April 2007 / Published 20 November 2007)

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 Ti is developed. The experimental error in Ti was too large, and was caused by the error in Q. Thus we have to improve the accuracy of the Q measurement.

Keywords

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

DOI: 10.1585/pfr.2.S1082

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This paper may be cited as follows:

Kiminori KURIHARA, Shinichiro KADO, Hiroto MATSUURA, Kyu-Sun CHUNG, Taiichi SHIKAMA, Yohei IIDA, Filippo SCOTTI, Yosuke KUWAHARA and Satoru TANAKA, Plasma Fusion Res. 2, S1082 (2007).