Reduction of fast ion drag in the presence of ‘hollow’ non-Maxwellian electron distributions

IF 2.1 2区 物理与天体物理 Q2 PHYSICS, FLUIDS & PLASMAS Plasma Physics and Controlled Fusion Pub Date : 2024-02-13 DOI:10.1088/1361-6587/ad238f
A P L Robinson
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Abstract

It is argued that the electronic stopping power in a plasma should be expected to exhibit significant differences in the presence of effects that shift the electron distribution function away from a Maxwellian. This is potentially important for nuclear reactions produced by laser-driven ion beams, where non-Maxwellian effects may have to be considered. We have calculated the electronic stopping power for a number of model distributions. Importantly, comparisons with the Maxwellian are done under the condition of energy density parity. ‘Hollow’ electron distribution functions (e.g. fvnfmax ) could be expected to show a reduced stopping power (when vi/vt<1 ). We show that this is indeed the case and that the difference can become a factor of 70. The super-Gaussian electron distribution function, on the other hand, will always show a higher stopping power than the Maxwellian for orders greater than 2.
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在存在 "空心 "非麦克斯韦电子分布的情况下减少快速离子阻力
有观点认为,等离子体中的电子阻挡功率在电子分布函数偏离麦克斯韦效应的情况下应表现出显著差异。这对于激光驱动离子束产生的核反应可能非常重要,因为在这种情况下可能必须考虑非麦克斯韦效应。我们计算了一些模型分布的电子停止功率。重要的是,与麦克斯韦分布的比较是在能量密度奇偶性条件下进行的。空心 "电子分布函数(如f∝vnfmax)可能会显示出较低的停止功率(当vi/vt<1时)。我们的研究表明,情况确实如此,而且两者之间的差异可以达到 70 倍。另一方面,当阶数大于 2 时,超高斯电子分布函数总是比麦克斯韦电子分布函数显示出更高的停止功率。
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来源期刊
Plasma Physics and Controlled Fusion
Plasma Physics and Controlled Fusion 物理-物理:核物理
CiteScore
4.50
自引率
13.60%
发文量
224
审稿时长
4.5 months
期刊介绍: Plasma Physics and Controlled Fusion covers all aspects of the physics of hot, highly ionised plasmas. This includes results of current experimental and theoretical research on all aspects of the physics of high-temperature plasmas and of controlled nuclear fusion, including the basic phenomena in highly-ionised gases in the laboratory, in the ionosphere and in space, in magnetic-confinement and inertial-confinement fusion as well as related diagnostic methods. Papers with a technological emphasis, for example in such topics as plasma control, fusion technology and diagnostics, are welcomed when the plasma physics is an integral part of the paper or when the technology is unique to plasma applications or new to the field of plasma physics. Papers on dusty plasma physics are welcome when there is a clear relevance to fusion.
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