球形等离子体聚焦装置中不同气体的离子束特性

M. A. Malek
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摘要

本研究在球形等离子聚焦装置KPU200 SPF中计算氩气、氖气和氮气随压力变化的离子束特性(通量、通量和能量)。采用Lee代码(版本:RADPFV5.16FIB),在0.10 ~ 19 Torr的压力范围内进行了数值实验。采用“等效矫直电极”技术得到了电极的几何形状。对每种气体的计算结果表明,离子束的性质随着压力的增加而增加,直到达到峰值,然后随着压力的进一步增加而开始降低。较重氩掐缩等离子体的离子束通量(离子m-2 s-1)、通量(离子m-2)和能量(J)分别在2 Torr下为5.31 × 1027,在3.5 Torr下为8.93 × 1020,在3 Torr下为3.46 × 104,这是氖气和氮气的最大值。本文注意并讨论了夹紧半径、持续时间、有效电荷数和感应电压与这些离子束性质的显著相关性。将所得结果与NX2等离子体聚焦装置的结果进行了比较,使本研究工作具有一致性。
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Characteristics of Ion Beam for Various Gases in a Spherical Plasma Focus Device
This study presents the computed ion beam properties (flux, fluence, and energy) of argon, neon, and nitrogen gases with pressure variation in the spherical plasma focus device, KPU200 SPF. Numerical experiments are performed using the Lee code (version: RADPFV5.16FIB) with the gases in the pressure range of 0.10 - 19 Torr. The electrode geometry has been obtained by applying the ‘equivalent straightened electrode’ technique. The computed results for each of the gases show that the ion beam properties increase with the increase in pressure until reach a peak value and then start to reduce with further pressure increase. The peak ion beam flux (ions m-2 s-1), fluence (ions m-2), and energy (J) from heavier argon pinch plasma are found as 5.31 × 1027 at 2 Torr, 8.93 × 1020 at 3.5 Torr, and 3.46 × 104 at 3 Torr, respectively which are the utmost values from neon and nitrogen gases. Significant correlations of pinch radius and duration, effective charge number, and induced voltage with these ion beam properties are noticed and discussed in this paper. The obtained results of this study are compared with those of the NX2 plasma focus device that makes the consistency of the present research work.
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