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Non-Maxwellian electron distributions and continuum X-ray emission in inverse Bremsstrahlung heated plasmas

J P Matte, M Lamoureux, C Moller, R Y Yin, J Delettrez, J Virmont, T W Johnston1988年Plasma Physics and Controlled FusionIF 2.2出版社

The heating of a completely ionized plasma by inverse Bremsstrahlung absorption (IB) is studied by numerically integrating the time varying kinetic equation for electrons, and the resulting distribution functions are used to calculate the continuum X-ray emission. The shape of the distribution functions is determined by the competition between IB and electron-electron collisions, and, in all the uniform plasma simulations, the authors find that the distributions are well fitted by the formula Cmexp(-( nu / nu m)m) where m is between 2 and 5. They find the dependence of m on alpha =Z2 nu osc/ nu th2, where Z is the atomic number, nu osc is the oscillation velocity in the laser field and nu th is the thermal velocity: m( alpha )=2+3/(1+1.66/ alpha 0.724). More importantly, in the realistic case of a space and time dependent kinetic simulation of a Be plasma heated by a Nd laser, including heat flow and ion motion, this fit remains valid for electron densities below 0.75 Nc (with constant m), although other effects come into play closer to the critical surface. Thus, these simple results can be used to determine the continuum X-ray spectrum due to Bremsstrahlung (BR) and to direct radiative recombination (DRR).

日本語訳

逆制動放射吸収(IB)による完全電離プラズマの加熱を、電子に対する時間依存運動方程式を数値積分することによって研究し、得られた分布関数を用いて連続X線放射を計算する。分布関数の形状は、IBと電子間衝突の競合によって決定され、すべての一様プラズマシミュレーションにおいて、分布は式 Cmexp(-(ν/νm)m) によって良好に近似されることが見出された。ここでmは2から5の間である。また、mのα = Z2νosc/νth2 への依存性が見出された。ここでZは原子番号、νoscはレーザー場における振動速度、νthは熱速度である:m(α) = 2+3/(1+1.66/α0.724)。さらに重要なことに、熱流とイオン運動を含む、BeプラズマをNdレーザーで加熱する現実的な時空間依存運動論シミュレーションにおいても、この近似は電子密度が0.75Nc未満の場合(mは一定)に有効であり、臨界表面に近づくと他の効果が現れる。したがって、これらの簡潔な結果は、逆制動放射(BR)および直接放射再結合(DRR)による連続X線スペクトルの決定に使用できる。

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