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Direct drive acceleration of planar targets with the Nike KrF laser

C.J Pawley, J.D Sethian, S.E Bodner, K.A Gerber, M Klapisch1999年Fusion Engineering and DesignIF 1.7出版社

AbstractNike is a multi-kilojoule KrF laser with very high beam uniformity (ΔI/I<0.2% with all 36 overlapped beams), and the capability to accelerate relatively thick targets on a low adiabat under conditions scalable to direct drive ICF. In a first set of experiments we determined the effect of the imprinting by varying the uniformity of the foot of the laser pulse and measuring the growth of the subsequent Rayleigh-Taylor instability. We found that the lower the imprint, the longer the mass modulations take to reach a given level. This is in quantitative agreement with our 2-D hydrodynamics simulations. The results are promising for direct drive with a very uniform laser.

日本語訳

Nikeは、多キロジュール級のKrFレーザーであり、全36本の重ね合わせビームにおいて非常に高いビーム均一性(ΔI/I<0.2%)を有し、直接駆動ICFにスケーラブルな条件下で、比較的厚いターゲットを低断熱線上で加速する能力を備えている。最初の一連の実験では、レーザーパルスのフット部の均一性を変化させることでインプリンティングの影響を評価し、その後のレイリー・テイラー不安定性の成長を測定した。その結果、インプリンティングが低いほど、質量変調が所定のレベルに達するまでの時間が長くなることが判明した。これは、我々の2次元流体シミュレーションと定量的に一致している。これらの結果は、非常に均一なレーザーを用いた直接駆動方式にとって有望なものである。

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