Direct-drive-implosion experiments with enhanced fluence balance on OMEGA
Direct-drive-implosion experiments with enhanced fluence balance on OMEGA
复制标题
在 OMEGA 上增强注量平衡的直接驱动内爆实验
DOI：
10.1063/1.1628234
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发表时间：
2004
影响因子：
2.2
通讯作者：
L. Waxer
中科院分区：
文献类型：
--
作者：
F. Marshall;J. Delettrez;R. Epstein;Robert A. Forties;R. Keck;J. Kelly;P. McKenty;S. Regan;L. Waxer
OMEGA [T]的直接驱动实验。R. Boehly等人，Opt. common . 133, 495(1997)]现在定期使用增强的单光束均匀性（通过光谱色散，包括分布式相位板和偏振旋转器，实现1太赫兹带宽平滑）进行。靶束能量平衡是由一组光束拾取器确定的，这些拾取器与全束量热计交叉校准，并通过独立测量每束在将光束传输到目标室时产生的损失。由于光束对光束、靶上能量差异和光束对光束形状差异引起的光照变化可以引入光照变化，从而驱动影响内爆的对称性。采用一种新技术，通过同时测量分离在直径4毫米的镀金球形靶上的所有60束射线产生的x射线通量，来确定靶室中心全功率靶上光束峰值影响的变化。推断出的光束对光束…
Direct-drive experiments on OMEGA [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)] are now regularly performed with enhanced single-beam uniformity (1-THz-bandwidth smoothing by spectral dispersion, including distributed phase plates and polarization rotators). The on-target-beam-energy balance is determined by a set of beam pickoffs that are cross-calibrated to full beam calorimeters and by independent measurements for each beam of the losses incurred in transporting the beams to the target chamber. Variations of the illumination due to beam-to-beam, on-target energy differences and beam-to-beam shape differences can then introduce variations of the illumination and hence drive symmetry that will affect implosions. A new technique has been implemented that determines variations of the beam peak fluences at target chamber center on a full-power target shot by simultaneously measuring the x-ray flux produced by all 60 beams separated on a 4-mm-diam, Au-coated spherical target. The inferred beam-to-beam,...