A new gamma ray spectrometer with high energy and time resolutions has been developed and installed on the EAST tokamak to study fast ion and runaway electron behaviors. The spectrometer is based on a LaBr3(Ce) scintillator detector and a fully digital data acquisition system that is based on a digitizer with digital pulse processing algorithms. The energy resolution of the spectrometer is about 3.9% at 662 keV, and the spectrometer can operate stably at a counting rate as high as 1 MHz, monitored by using a light emitting diode monitoring system. The measured gamma ray spectrum is simulated based on Geant4 and unfolded with the high-resolution boosted Gold deconvolution algorithm, aiming at reconstructing the energy distribution functions of fast ions and runaway electrons.

中文翻译：

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EAST托卡马克高能量和时间分辨率伽马能谱仪的研制

一种具有高能量和时间分辨率的新型伽马射线光谱仪已开发并安装在 EAST 托卡马克上，用于研究快离子和失控电子行为。该光谱仪基于 LaBr3(Ce) 闪烁体探测器和全数字数据采集系统，该系统基于具有数字脉冲处理算法的数字化仪。该光谱仪在662 keV时能量分辨率约为3.9%，光谱仪可在高达1 MHz的计数率下稳定运行，采用发光二极管监测系统进行监测。测得的伽马射线谱基于Geant4进行模拟，并采用高分辨率boost Gold反卷积算法展开，旨在重构快离子和失控电子的能量分布函数。