不同阳极形状下等离子体聚焦器件氖软x射线产率的Lee模型码预测数值研究

IF 1.1 4区 物理与天体物理 Q4 PHYSICS, FLUIDS & PLASMAS
R. Albahri, Y. Abou-Ali, M. Akel
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引用次数: 0

摘要

利用Lee模型代码进行了数值实验,研究了NX2等离子体聚焦装置在不同工作电压下的软x射线特性与压力的关系,采用两种类型的阳极(圆柱形和锥形)。从圆柱形阳极切换到锥形阳极时,计算产率提高了5倍,与实验结果一致。随后,通过数值实验研究了不同的锥度条件(锥度末端的阳极半径和锥度开始时的轴向距离)对软x射线产率的影响,得到了有趣的结果。我们发现,产率与锥度开始的轴向距离无关,但在很大程度上与锥度的端阳极半径有关,因为有一个最佳的锥度端阳极半径,可以提供最高的软x射线产率。利用以往计算和测量结果的收敛性,在PF-24器件上进行数值实验,找出不同阳极形状(圆柱形和锥形)下最佳压力对应的软x射线特性和最大软x射线产率。此外,通过数值实验找到了能使PF-24器件软x射线产率达到最大的圆柱形阳极几何尺寸(阳极半径、阳极长度)和锥形条件(锥度末端的阳极半径和锥度起始处的轴向距离)。在PF-24器件上得到的结果与在NX2器件上得到的结果完全相同。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Numerical Study for Prediction of Neon Soft X-Ray Yield Emitted from the Plasma Focus Devices Using the Lee Model Code for Different Anode Shapes

Numerical Study for Prediction of Neon Soft X-Ray Yield Emitted from the Plasma Focus Devices Using the Lee Model Code for Different Anode Shapes

Numerical experiments were performed using the Lee model code to study the soft X-ray characteristics versus pressure at different operating voltages of the NX2 plasma focus device for two types of anodes (cylindrical and tapered). It was observed that the computed yield increased by 5 times when switching from the cylindrical anode to the tapered one, which agreed with the experimental results. Later, numerical experiments were conducted to study the effect of the different tapering conditions (anode radius at the end of the taper and axial distance at the start of the taper) on the soft X-ray yield, interesting results were reached. We found that the yield is not related to the axial distance for the taper start, but is largely related to the end anode radius of the taper, as there is an optimum end anode radius of the taper that gives the highest yield for soft X-ray. The convergence in previous computed and measured results was taken advantage to conduct numerical experiments on the PF-24 device to find the soft X-ray characteristics and the maximum soft X-ray yield corresponding to the optimum pressure for different anode shapes (cylindrical and tapered). In addition, numerical experiments were conducted to find the optimum conditions of geometric dimensions of the cylindrical anode (anode radius, anode length), and tapering conditions (anode radius at the end of the taper and axial distance at the start of the taper) which give the maximum soft X-ray yield for PF-24 device. The results obtained for the PF-24 device behave identically to the behavior of the results obtained for the NX2 device.

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来源期刊
Plasma Physics Reports
Plasma Physics Reports 物理-物理:流体与等离子体
CiteScore
1.90
自引率
36.40%
发文量
104
审稿时长
4-8 weeks
期刊介绍: Plasma Physics Reports is a peer reviewed journal devoted to plasma physics. The journal covers the following topics: high-temperature plasma physics related to the problem of controlled nuclear fusion based on magnetic and inertial confinement; physics of cosmic plasma, including magnetosphere plasma, sun and stellar plasma, etc.; gas discharge plasma and plasma generated by laser and particle beams. The journal also publishes papers on such related topics as plasma electronics, generation of radiation in plasma, and plasma diagnostics. As well as other original communications, the journal publishes topical reviews and conference proceedings.
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