Mixed Pierce-two-stream instability development in an extraction system of a negative ion source

被引：3
|
作者：
Barminova, H. Y. [1 ]
Chikhachev, A. S. [2 ]
机构：
[1] Natl Res Nucl Univ MEPhI, Kashirskoye Sh 31, Moscow 115409, Russia
[2] All Russian Electrotech Inst VEI, State Sci Ctr, Krasnokazarmennaya St 12, Moscow 111250, Russia
来源：
REVIEW OF SCIENTIFIC INSTRUMENTS | 2016年 / 87卷 / 02期
关键词：
D O I：
10.1063/1.4935642
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
Mixed Pierce-two-stream instability may occur in an extraction system of a negative ion source based on a volume-produced plasma. The reasons for instability development are discussed. Analytically the conditions of unstable beam propagation are determined. The instability threshold is shown to be increased compared with the pure Pierce instability. The influence of inclined perturbations on the instability behavior is investigated. The numerical calculations are performed in COMSOL Multiphysics. The simulation results confirm the existence of such a mixed instability appearance that develops due to both the electrons of the external circuit and the background positive ions. (C) 2015 AIP Publishing LLC.
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页数：3
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