The effect of fast electrons on fast ion loss detector

Zhao JIN; Jiafeng CHANG; Juan HUANG; Chengrui WU; Shiyao LIN

doi:10.11889/j.0253-3219.2017.hjs.40.110605

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The effect of fast electrons on fast ion loss detector

NUCLEAR ENERGY SCIENCE AND ENGINEERING | 更新时间：2021-05-19

- The effect of fast electrons on fast ion loss detector
- NUCLEAR TECHNIQUES Vol. 40, Issue 11, Article number: 110605(2017)
- 作者机构：
  
  1.中国科学院等离子体物理研究所合肥 230031
  2.中国科学技术大学合肥 230026
- 作者简介：
- 基金信息：
  
  Nation Magnetic Confinement Fusion Science Program of China;Nation Magnetic Confinement Fusion Science Program of China;National Natural Science Foundation of China
- DOI：10.11889/j.0253-3219.2017.hjs.40.110605
  CLC： TL99
- Received：18 May 2017，
  
  Revised：30 June 2017，
  
  Published：10 November 2017
- 稿件说明：
移动端阅览
Zhao JIN, Jiafeng CHANG, Juan HUANG, et al. The effect of fast electrons on fast ion loss detector[J]. Nuclear techniques, 2017, 40(11): 110605
DOI：

Zhao JIN, Jiafeng CHANG, Juan HUANG, et al. The effect of fast electrons on fast ion loss detector[J]. Nuclear techniques, 2017, 40(11): 110605 DOI： 10.11889/j.0253-3219.2017.hjs.40.110605.

摘要

基于闪烁体原理的快离子损失探针（Fast Ion Loss Detector，FILD），可以同时测量损失快离子的能量和pitch-angle的值，是核聚变装置中对高能粒子诊断的重要方式。根据先进实验超导托卡马克（Experimental Advanced Superconducting Tokamak，EAST）的发展需求，为了更好地对损失快离子行为进行研究，设计并安装了快离子损失诊断，且探测到在中性束加热条件下产生的损失快离子。同时，探测到在放电中产生的逃逸电子，以及低杂波注入时快电子产生X射线对快离子损失背景信号的影响。并且在H-mode放电时边界扰动也对快离子损失信号产生影响，这些探测到的现象都为不断升级损失诊断系统提供依据。

Abstract

Background

A scintillator-based fast ion loss detector (FILD) can simultaneously measure the energy and pitch angle of escaped fast ions

which is a powerful method to study the behavior of fast ion feature.

Purpose

Investigating the performance of the fast ion loss is very helpful for understanding plasma confinement due to the development of experimental advanced superconducting tokamak (EAST).

Methods

FILD has been successfully put into operation on EAST

and the behavior of fast ion can be analyzed by charge coupled device (CCD) and photomultiplier tube (PMT) data acquisition system.

Results

When the neutral beams were injected

the fast ion losses were detected. Runaway electrons and the fast electrons were observed when lower hybrid waves were injected into plasma

resulting in the effect of X-rays on the fast ion loss signal. In H-mode discharge condition

the fast ion losses signal changed with D-alpha signals.

Conclusion

Fast ion loss detector system plays an important role in investigating loss ions behavior during neutral beam heating. Runaway electrons and fast electrons would affect the fast ion loss signal. At the same time

FILD will be upgraded with the probe structure and new scintillator material will be selected to minimize the impact of X-ray.

关键词

Keywords

references

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