Upgrade of the JET tangential gamma-ray spectrometer. Conceptual design

V. Zoita, T. Craciunescu, I. Tiseanu, M. Curuia, S. Soare, M. Anghel, V. Braic, M. Braic, G. Gros, V. Kiptily, T. Edlington, P. Prior, S. Sanders, B. Syme, L. Rı́os, P. Blanchard, A. Murari
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引用次数: 2

Abstract

A conceptual design for the upgrade of the JET tangential gamma-ray spectrometer (TGRS) has been carried out. The main design target for the TGRS upgrade is to maximize the signal-to background ratio at the spectrometer detector, the ratio being defined in terms of the plasma emitted gamma radiation and the gamma-ray background. A complex system of collimators and shields for both the neutron and gamma radiations define the spectrometer field of view. Two tandem collimators determine the field of view through the tokamak plasma. The entrance aperture to the penetration in the JET Torus Hall south wall is defined by a neutron shield. Two gamma-ray shields together with the existing concrete collimator determine the field of view at the bismuth germanate (BGO) gamma-ray detector. One of the gamma-ray shields (with an embedded neutron attenuator) can be remotely moved in and out of the detector line of sight thus providing flexibility in definition of the neutron and gamma-ray fields at the BGO detector. Neutron attenuators using lithium hydride (LiH) with natural isotopic composition (that meets the requirements for gamma-ray transparency) could provide the necessary attenuation factors (approximately 104 for the 2.45 MeV neutrons and 102 for the 14.1 MeV neutrons). A hot pressing technology has been proposed for the construction of the lithium hydride attenuators. The performance of a simplified geometry TGRS has been evaluated by preliminary neutron and photon transport calculations and the results show that the design parameters could be attained.
JET切向伽玛射线光谱仪的升级。概念设计
对JET切向伽玛射线谱仪(TGRS)的升级进行了概念设计。TGRS升级的主要设计目标是最大限度地提高光谱仪探测器的信本比,该比是根据等离子体发射的伽马辐射和伽马射线背景来定义的。一个复杂的系统的准直器和屏蔽的中子和伽马辐射确定了光谱仪的视野。两个串联准直器通过托卡马克等离子体确定视场。射流环面厅南壁穿透的入口孔径由中子屏蔽层确定。两个伽玛射线屏蔽与现有的混凝土准直器一起确定了锗酸铋(BGO)伽玛射线探测器的视场。其中一个伽马射线屏蔽(内置中子衰减器)可以远程移动到探测器的视线内或视线外,从而为BGO探测器的中子和伽马射线场的定义提供了灵活性。使用具有天然同位素组成(满足伽马射线透明度要求)的氢化锂(LiH)的中子衰减器可以提供必要的衰减因子(2.45 MeV中子约为104,14.1 MeV中子约为102)。提出了一种用于氢化锂衰减器结构的热压技术。通过初步的中子输运和光子输运计算,对简化几何TGRS的性能进行了评价,结果表明可以达到设计参数。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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