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Measurements of the heat flux, inverse bremsstrahlung absorption and equilibration in an under-dense laser heated plasma

A Dyson, A E Dangor, A K L Dymoke-Bradshaw, R G Evans1988年Plasma Physics and Controlled FusionIF 2.2出版社

A fully ionised hydrogen plasma of initial density approximately=5*1017 cm-3 and temperature approximately=12 eV is heated using a 1.053 mu m laser beam focussed to a spot of 200 mu m diameter with an irradiance of 5*1013 W cm-2. The resulting evolution of the plasma is monitored by Thomson scattering of a second laser beam at 5265 AA. Comparison with a one-dimensional two fluid hydrodynamic simulation shows that the inverse bremsstrahlung absorption coefficient should be modified to include the strong field correction and that the maximum heat flux is about 0.1 of the free streaming limit. The ratio of the electron mean free path to the temperature scale length is about 0.1 and Te/Ti approximately=5. The level of ion acoustic turbulence is observed to be small, close to thermal. The ion-electron equilibration rate is found to agree with the usual classical value.

日本語訳

完全電離した水素プラズマ(初期密度約5×10¹⁷ cm⁻³、温度約12 eV)を、直径200 μmのスポットに集光した1.053 μmレーザービーム(照射強度5×10¹³ W cm⁻²)を用いて加熱する。その後のプラズマの時間発展は、5265 Åにおける第二レーザービームのトムソン散乱によってモニタリングされる。一次元二流体流体力学シミュレーションとの比較により、逆制動放射吸収係数は強い場の補正を含むように修正されるべきであり、最大熱流束は自由ストリーミング限界の約0.1倍であることが示される。電子の平均自由行程と温度勾配長の比は約0.1であり、Te/Tiは約5である。イオン音波乱流のレベルは小さく、熱平衡に近いことが観測される。イオン-電子平衡化率は、通常の古典値と一致することが見出される。

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