The onset of filamentation, following the interaction of a relatively long (tau(L) similar or equal to 1 ns) and intense (I-L similar or equal to 5 x 10(14) W/cm(2)) laser pulse with a neopentane filled gas bag target, has been experimentally studied via the proton radiography technique, in conditions of direct relevance to the indirect drive inertial confinement fusion scheme. The density gradients associated with filamentation onset have been spatially resolved yielding direct and unambiguous evidence of filament formation and quantitative information about the filamentation mechanism in agreement with previous theoretical modelings. Experimental data confirm that, once spatially smoothed laser beams are used, filamentation is not a relevant phenomenon during the heating laser beams propagation through typical hohlraum gas fills.
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机译：随着相对长的（tau（L）等于或等于1 ns）和强烈的（IL等于或等于5 x 10（14）W / cm（2））激光脉冲与新戊烷的相互作用而开始丝状化在与间接驱动惯性约束聚变方案直接相关的条件下，已通过质子射线照相技术对填充的气囊目标进行了实验研究。与纤丝形成相关的密度梯度已在空间上得到解析，与先前的理论模型相一致，可提供纤丝形成的直接和明确的证据以及有关纤丝形成机理的定量信息。实验数据证实，一旦使用了空间平滑的激光束，在加热激光束传播通过典型的霍尔气体填充物的过程中，丝状化就不是一个相关现象。
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