Abstract:

The configuration of the omegatron detector developed for the HT-7 tokamak is described. The detector has been employed under the condition of ohmic discharges. The detector was located near the limiter and the plasma was introduced into it through a pinhole. The biasing voltages were used to separate the ions and electrons. After being decelerated, the ions enter the cavity and resonate with the superimposing effect of RF electronic field and magnet ic field.Resonant ion current signals have been collected successfully. Analyzing the resonant peak is an effect ive method to acquire the charge-mass ratio and cyclotron frequency of the ions. The resonant peaks of the ions at the charge-mass ratio 1,0.5,0.3333 and 0.1819 were observed in the experiment.

Key words: Omegatron, Cyclotron resonance, Ion current , Resonant peak

摘要：

介绍了回旋质谱探测器的原理和设计及其在HT-7 装置欧姆放电下对边缘等离子体中离子的诊断实验。探测器安装在限制器附近, 通过一小孔引进等离子体; 设置的前置偏压使电子和离子分离, 并使离子减速; 进入腔体内部的离子在射频电场和平行磁场的作用下发生回旋共振; 通过考察收集的离子电流信号中的共振峰可得到离子的荷质比、回旋频率等参数。实验中观察到荷质比为1、0. 5、0. 3333、0 . 1819 的离子共振峰。

关键词: 回旋质谱仪, 回旋共振, 离子电流, 共振峰