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Design of ITER neutron yield monitor using microfission chambers

T Nishitani, K Ebisawa, T Iguchi, T Matoba1997年Fusion Engineering and DesignIF 1.7出版社

AbstractWe propose a microfission chamber system which will be installed near the first wall region of ITER as the neutron yield monitor. This system has a wide dynamic range of 1010 with a temporal resolution of 1 ms and is easily calibrated by a neutron transport calculation. The 234U (80%) + 235U (20%) fission chamber, the lifetime of which is about four times longer than that of the 235U chamber, can be used in ITER for one third of the ITER lifetime. We expect that these detectors will be operated in a high magnetic field near the first wall of ITER. Four sets of the detectors will be installed in the large side port and three blanket modules. Techniques for the replacement of those detectors are discussed.

日本語訳

我々は、ITERの第一壁領域近傍に設置される中性子収量モニタとして、マイクロ核分裂チェンバーシステムを提案する。本システムは、10¹⁰の広いダイナミックレンジと1 msの時間分解能を有し、中性子輸送計算により容易に校正が可能である。²³⁴U(80%)+²³⁵U(20%)核分裂チェンバーは、²³⁵Uチェンバーの約4倍の寿命を有し、ITERの運転寿命の約3分の1の期間使用することができる。これらの検出器は、ITERの第一壁近傍の高磁場環境下で動作することが期待される。4セットの検出器が大型サイドポートおよび3つのブランケットモジュールに設置される。これらの検出器の交換手法について議論する。

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