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

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.