Abstract

A hard X-ray pinhole camera system has been recently built at the HL-2A tokamak to measure the evolution of space-time distribution of fast electrons in the energy range of 20 to 200 keV. The camera is mainly composed of a fan-shaped detector array, an observation window, a pinhole mechanism, and a data processing system. The detector array consists of 21 CdTe detectors that are arranged in a poloidal section. The camera views the plasma perpendicularly through an observation window mounted in a horizontal port on the equatorial plane. The data processing is implemented by a fast spectrometry based on field-programmable gate array technology. The time and space resolution of the camera can reach 2 to 16 ms and 2 cm, respectively. During the HL-2A experiment campaign in 2018, measurements of fast electrons produced by lower hybrid waves using the camera were successfully performed. The performance of the camera and the first experimental results with some discussions are presented in this paper.

摘要

最近在HL-2A托卡马克实验室建立了一个硬X射线针孔照相机系统，以测量20至200 keV能量范围内快速电子的时空分布。照相机主要由扇形检测器阵列，观察窗，针孔机构和数据处理系统组成。检测器阵列由21个CdTe检测器组成，这些检测器排列在极点部分。摄像机通过安装在赤道平面上水平端口中的观察窗垂直观察等离子体。数据处理通过基于现场可编程门阵列技术的快速光谱法实现。相机的时间和空间分辨率分别可以达到2到16毫秒和2厘米。在2018年的HL-2A实验活动中，使用相机成功地测量了由低杂波产生的快速电子。本文介绍了相机的性能和第一个实验结果，并进行了一些讨论。