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

A P L Robinson2024年Plasma Physics and Controlled FusionIF 2.2出版社

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. ) could be expected to show a reduced stopping power (when ). 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.

日本語訳

電子阻止能は、電子分布関数をマクスウェル分布からずらす効果が存在する場合、プラズマ中で有意な差異を示すと主張される。これは、レーザー駆動イオンビームによって生成される核反応にとって潜在的に重要であり、非マクスウェル効果を考慮する必要があるかもしれない。我々は、いくつかのモデル分布関数に対する電子阻止能を計算した。重要なことに、マクスウェル分布との比較はエネルギー密度の等価性の条件下で行われる。「中空」電子分布関数(例えば、 )は、阻止能の低下を示すと予想される( )。我々は、これが実際に当てはまること、そしてその差が70倍にもなり得ることを示す。一方、超ガウス電子分布関数は、次数が2より大きい場合、常にマクスウェル分布よりも高い阻止能を示す。

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