Detailed design of ex-vessel neutron yield monitor for ITER

K. Asai; T. Iguchi; K. Watanabe; J. Kawarabayashi; T. Nishitani; C. I. Walker

doi:10.1063/1.1779619

Detailed design of ex-vessel neutron yield monitor for ITER

K. Asai, T. Iguchi, K. Watanabe, J. Kawarabayashi, T. Nishitani, C. I. Walker

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

Taking into consideration the latest design of the International Thermonuclear Experimental Reactor (ITER) main units, we have made the detailed design consideration for an ex-vessel neutron yield monitor to meet the ITER requirements. The monitoring system is constructed of four detector modules consisting of several ²³⁵U fission chambers with different sensitivities and graphite (or beryllium) neutron moderator. We also selected possible spaces in the diagnostic ports to install them at appropriate distances and neutron shielding effects from the plasma. Through Monte Carlo neutron transport calculations, it has been confirmed that the present system can cover all the neutron yields encountered in the ITER experiments including the in situ calibrations with a time resolution around 200 μS without detector replacement over the whole ITER experiments. This system can also be calibrated with 10% of required accuracies in a realistic 50 h of accumulation time using a DT neutron generator.

Original language	English
Pages (from-to)	3537-3539
Number of pages	3
Journal	Review of Scientific Instruments
Volume	75
Issue number	10 II
DOIs	https://doi.org/10.1063/1.1779619
Publication status	Published - Oct 2004
Externally published	Yes

All Science Journal Classification (ASJC) codes

Instrumentation

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10.1063/1.1779619

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title = "Detailed design of ex-vessel neutron yield monitor for ITER",

abstract = "Taking into consideration the latest design of the International Thermonuclear Experimental Reactor (ITER) main units, we have made the detailed design consideration for an ex-vessel neutron yield monitor to meet the ITER requirements. The monitoring system is constructed of four detector modules consisting of several 235U fission chambers with different sensitivities and graphite (or beryllium) neutron moderator. We also selected possible spaces in the diagnostic ports to install them at appropriate distances and neutron shielding effects from the plasma. Through Monte Carlo neutron transport calculations, it has been confirmed that the present system can cover all the neutron yields encountered in the ITER experiments including the in situ calibrations with a time resolution around 200 μS without detector replacement over the whole ITER experiments. This system can also be calibrated with 10% of required accuracies in a realistic 50 h of accumulation time using a DT neutron generator.",

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T1 - Detailed design of ex-vessel neutron yield monitor for ITER

AU - Asai, K.

AU - Iguchi, T.

AU - Watanabe, K.

AU - Kawarabayashi, J.

AU - Nishitani, T.

AU - Walker, C. I.

PY - 2004/10

Y1 - 2004/10

N2 - Taking into consideration the latest design of the International Thermonuclear Experimental Reactor (ITER) main units, we have made the detailed design consideration for an ex-vessel neutron yield monitor to meet the ITER requirements. The monitoring system is constructed of four detector modules consisting of several 235U fission chambers with different sensitivities and graphite (or beryllium) neutron moderator. We also selected possible spaces in the diagnostic ports to install them at appropriate distances and neutron shielding effects from the plasma. Through Monte Carlo neutron transport calculations, it has been confirmed that the present system can cover all the neutron yields encountered in the ITER experiments including the in situ calibrations with a time resolution around 200 μS without detector replacement over the whole ITER experiments. This system can also be calibrated with 10% of required accuracies in a realistic 50 h of accumulation time using a DT neutron generator.

AB - Taking into consideration the latest design of the International Thermonuclear Experimental Reactor (ITER) main units, we have made the detailed design consideration for an ex-vessel neutron yield monitor to meet the ITER requirements. The monitoring system is constructed of four detector modules consisting of several 235U fission chambers with different sensitivities and graphite (or beryllium) neutron moderator. We also selected possible spaces in the diagnostic ports to install them at appropriate distances and neutron shielding effects from the plasma. Through Monte Carlo neutron transport calculations, it has been confirmed that the present system can cover all the neutron yields encountered in the ITER experiments including the in situ calibrations with a time resolution around 200 μS without detector replacement over the whole ITER experiments. This system can also be calibrated with 10% of required accuracies in a realistic 50 h of accumulation time using a DT neutron generator.

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Detailed design of ex-vessel neutron yield monitor for ITER

Abstract

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