关于从用于聚变的长脉冲负离子源射出的杂散电子的研究

IF 2.1 2区 物理与天体物理 Q2 PHYSICS, FLUIDS & PLASMAS
Yuwen Yang, Jianglong Wei, Yuming Gu, Yahong Xie, Chundong Hu
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引用次数: 0

摘要

基于负离子的中性束注入是大型磁核聚变装置理想的等离子体加热和电流驱动方法。由于核聚变对负离子源的严格要求和研制难度,中国在核聚变技术综合研究装置的框架下研制了长脉冲负离子源。该负离子源由一个射频驱动等离子体源和一个三电极加速器组成。典型的萃取电压和加速电压分别为 4-8 千伏和 40-50 千伏。在一次长脉冲(∼100 秒)束流萃取过程中,真空容器中的气体压力急剧上升,低温泵的温度从 8 K 升至 20 K。束气相互作用的自洽模拟显示,容器壁上的热负荷应该是由加速器射出的杂散电子引起的。这些杂散电子主要通过剥离或电离碰撞产生,并被共萃取电子的偏转磁场下游侧强烈偏转。红外热成像测量到的热点位置与模拟结果一致。为了解决这个问题,我们设计了一系列电子甩尾,以避免喷射出的电子直接撞击低温泵和容器壁。结果表明,热点几乎被消除。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Study on stray electrons ejecting from a long-pulse negative ion source for fusion
The negative ion based neutral beam injection is a desirable plasma heating and current drive method for the large-scale magnetic fusion devices. Due to the strict requirements and difficult development of the negative ion source for fusion, a long-pulse negative ion source has been developed under the framework of the Comprehensive Research Facility for Fusion Technology in China. This negative ion source consists of a single radio frequency (RF) driver plasma source and a three-electrode accelerator. The typical extraction and acceleration voltage are 4–8 kV and 40–50 kV, respectively. During one shot of the long-pulse (∼100 s) beam extraction, the gas pressure in the vacuum vessel increased sharply and the temperature of the cryopump rise from 8 K to 20 K. Moreover, the vessel wall appeared a high temperature after several long-pulse shots. A self-consistent simulation of beam-gas interaction revealed that the heat loads on the vessel wall should be caused by the stray electrons ejecting from the accelerator. Those stray electrons are mainly generated via the stripping or ionization collisions and strongly deflected by the downstream side of the deflection magnetic field for the co-extracted electron. The location of hot spots measured by infrared thermography is consistent with the simulation results. To solve this problem, a series of electron dumps are designed to avoid the direct impinging of the ejecting electrons on the cryopump and the vessel wall. And the results suggest that the hot spots are almost eliminated.
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来源期刊
Plasma Physics and Controlled Fusion
Plasma Physics and Controlled Fusion 物理-物理:核物理
CiteScore
4.50
自引率
13.60%
发文量
224
审稿时长
4.5 months
期刊介绍: Plasma Physics and Controlled Fusion covers all aspects of the physics of hot, highly ionised plasmas. This includes results of current experimental and theoretical research on all aspects of the physics of high-temperature plasmas and of controlled nuclear fusion, including the basic phenomena in highly-ionised gases in the laboratory, in the ionosphere and in space, in magnetic-confinement and inertial-confinement fusion as well as related diagnostic methods. Papers with a technological emphasis, for example in such topics as plasma control, fusion technology and diagnostics, are welcomed when the plasma physics is an integral part of the paper or when the technology is unique to plasma applications or new to the field of plasma physics. Papers on dusty plasma physics are welcome when there is a clear relevance to fusion.
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