首页|Characteristics of the pressure profile in the accelerator on the RF negative ion source at ASIPP

Characteristics of the pressure profile in the accelerator on the RF negative ion source at ASIPP

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Neutral beam injection(NBI)systems based on negative hydrogen ion sources—rather than the positive ion sources that have typically been used to date—will be used in the future magnetically confined nuclear fusion experiments to heat the plasma.The collisions between the fast negative ions and neutral background gas result in a significant number of high-energy positive ions being produced in the acceleration area,and for the high-power long-pulse operation of NBI systems,this acceleration of positive ions back to the ion source creates heat load and material sputtering on the source backplate.This difficulty cannot be ignored,with the neutral gas density in the acceleration region having a significant impact on the flux density of the backstreaming positive ions.In the work reported here,the pressure gradient in the acceleration region was estimated using an ionization gauge and a straightforward 1D computation,and it was found that once gas traveled through the acceleration region,the pressure dropped by nearly one order of magnitude,with the largest pressure drop occurring at the plasma grid.The computation also revealed that the pressure drop in the grid gaps was substantially smaller than that in the grid apertures.

Pressure gradientNegative ion sourceAperture conductanceNeutral beam injection

Mingshan Wu、Luxiang Xu、Yanbo Zhou、Lizhen Liang、Yelong Zheng

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School of Fundamental Physics and Mathematical Sciences,Key Laboratory of Gravitational Wave Precision Measurement of Zhejiang Province,Taiji Laboratory for Gravitational Wave Universe,Hangzhou Institute for Advanced Study,University of Chinese Academy of Sciences,Hangzhou 310024,China

University of Chinese Academy of Sciences,Beijing 100049,China

Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,China

State Key Laboratory of Precision Measuring Technology and Instruments,Tianjin University,Tianjin 300072,China

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National Key Research and Development Program of China

2021YFC2202700

2023

10.1063/10.0019383

纳米技术与精密工程(英文)
中国微米纳米技术学会,天津大学

纳米技术与精密工程(英文)

CSTPCDCSCDEI
影响因子：0.476
ISSN：1672-6030
年,卷(期)：2023.6(3)
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