ITER-CS インサート・コイルの常伝導伝播とホットスポット温度の解析

The Central Solenoid (CS) insert coil consists of a 42-m-long CS conductor, of which the specifications are the same
as that of the ITER CS. In order to investigate normal zone propagation and hot spot temperature, a quench test was carried out
on the CS insert under End-of-Burn condition at 12.5 T and 45.1 kA of after 16,000 cycles. External heat was applied at nearly
the center of the CS insert using an inductive heater, and quench was induced. A current of 45.1 kA was dumped 9.5 s (7 s) after
voltage generation (Quench detection, QD). The Normal zone propagation length reached 23.4 m, and the maxim propagation
velocity was 3.1 m/s just before dumping. Considering the distribution of temperature, which is calculated by GANDALF, hot
spot temperature was expected to reach 227 K. As the result, it was found that the hot spot temperature exceeded the criteria of
150 K which is designed on ITER. However, heating the CS insert to 227 K did not influence conductor performance, because the
current sharing temperature was maintained after the quench test. Therefore, the quench detection has a margin of approximately
9.5 s (7 s) after voltage generation (QD) in view of the conductor performance under the conditions applied in this quench test. If
the hot spot temperature is kept to less than 150 K, the current should be dumped 7.5 s (5 s) before voltage generation (QD).
These results are very useful for designing quench protection of the ITER CS.

書誌情報

低温工学

巻 51, 号 4, p. 122-128, 発行日 2016-06

出版者

公益社団法人低温工学・超電導学会

ISSN

収録物識別子タイプ

ISSN

収録物識別子

0389-2441

DOI

識別子タイプ

DOI

Versions

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2023-05-15 18:00:32.876481

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