一种用于欧洲联合环形加速器氘和氘 - 氚等离子体中快离子测量的新型切向伽马射线光谱仪。

A new tangential gamma-ray spectrometer for fast ion measurements in deuterium and deuterium-tritium plasmas of the Joint European Torus.

作者信息

Nocente M, Craciunescu T, Gorini G, Kiptily V, Tardocchi M, Braic V, Curuia M, Dal Molin A, Figueiredo J, Giacomelli L, Iliasova M, Kazakov Y, Khilkevitch E, Marcer G, Panontin E, Rigamonti D, Salewski M, Shevelev A, Soare S, Zoita V, Zychor I

机构信息

Department of Physics "G. Occhialini," University of Milano-Bicocca, 20126 Milan, Italy.

Institute of Atomic Physics, Magurele-Bucharest 077125, Romania.

出版信息

Rev Sci Instrum. 2021 Apr 1;92(4):043537. doi: 10.1063/5.0043806.

DOI:10.1063/5.0043806

PMID:34243441

Abstract

A new tangential gamma-ray spectrometer has been developed for fast ion measurements in deuterium and deuterium-tritium plasmas of the Joint European Torus (JET). The instrument is based on a LaBr crystal with a photo-multiplier tube and replaces a pre-existing bismuth germanate detector, providing enhanced energy resolution and a counting rate capability in the MHz range. The line of sight is equipped with a LiH attenuator, which reduces the background due to 14 MeV neutron interactions with the crystal by more than two orders of magnitude and enables the observation of gamma-ray emission from confined α particles in JET deuterium-tritium plasmas. Thanks to its tangential line of sight, the detector can distinguish co- and counter-passing ions. The performance of the instrument is demonstrated through the results of recent JET fast ion experiments in deuterium plasmas.

摘要

一种新型切向伽马射线光谱仪已被开发出来，用于在欧洲联合环面（JET）的氘和氘 - 氚等离子体中进行快离子测量。该仪器基于一块配备光电倍增管的溴化镧晶体，取代了先前使用的锗酸铋探测器，具有更高的能量分辨率以及兆赫兹范围内的计数率能力。视线上配备了一个氢化锂衰减器，它将14兆电子伏中子与晶体相互作用产生的本底降低了两个多数量级，从而能够观测到JET氘 - 氚等离子体中受限α粒子发出的伽马射线。由于其切向视线，该探测器能够区分同向和反向通过的离子。通过近期JET在氘等离子体中进行的快离子实验结果展示了该仪器的性能。