Manipulating large-area, heavy metal ion beams with a high-current electrostatic plasma lens

被引:21
作者
Goncharov, AA
Protsenko, IM
Yushkov, GY
Brown, IG
机构
[1] NASU, Inst Phys, UA-03039 Kiev, Ukraine
[2] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA
[3] Russian Acad Sci, Inst High Current Elect, Tomsk 634055, Russia
关键词
Intense ion beams; ion beams; ion focusing; plasma lens; plasma optics;
D O I
10.1109/27.902252
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
We describe some experimental investigations of the manipulation of high-current, targe-area beams of heavy metal ions using a high-current electrostatic plasma lens. Beams of carbon, copper, zinc, and tantalum ions (separately) were formed by a repetitively pulsed vacuum are ion source, with energy in the range about 10-140 keV beam current up to 0.5 A, initial beam diameter 10 cm, and pulse length 250 ms. The plasma lens was of IO-cm internal diameter and 20-cm length and had nine electrostatic ring electrodes rrilh potential applied to the central electrode of up to 7 kV: in the presence of a pulsed magnetic field of up to 800 Gauss, The current density profile of the focused beam was measured with a radially moveable, magnetically suppressed Faraday cup. The results show that the focal length of the lens and the profile of the transported beam can be controlled by variation of the lens magnetic field and electrode potential distribution. Under optimum operating conditions the ion beam current density at the focus was compressed bg; a factor of up to 31. We also carried out some preliminary observations of the effect of the plasma lens on the ion charge state distribution of the beam. Here we outline the principles underlying plasma lens operation and summarize the experimental observations we have made of the lens performance in this large-area, high-current regime.
引用
收藏
页码:2238 / 2246
页数:9
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