Role of hot-electron preheating in the compression of direct-drive imploding targets with cryogenic D2 ablators.
Role of hot-electron preheating in the compression of direct-drive imploding targets with cryogenic D2 ablators.
复制标题
DOI：
10.1103/physrevlett.100.185005
复制
发表时间：
2008-05
影响因子：
8.6
通讯作者：
V. Smalyuk;D. Shvarts;R. Betti;J. Delettrez;D. Edgell;V. Glebov;V. Goncharov;R. Mccrory;D. Meyerhofer;P. Radha;S. Regan;T. Sangster;W. Seka;S. Skupsky;C. Stoeckl;B. Yaakobi;J. Frenje;Chikang Li;R. Petrasso;R. Petrasso;F. Séguin
中科院分区：
文献类型：
--
作者：
V. Smalyuk;D. Shvarts;R. Betti;J. Delettrez;D. Edgell;V. Glebov;V. Goncharov;R. Mccrory;D. Meyerhofer;P. Radha;S. Regan;T. Sangster;W. Seka;S. Skupsky;C. Stoeckl;B. Yaakobi;J. Frenje;Chikang Li;R. Petrasso;R. Petrasso;F. Séguin
在60束、351 nm的欧米伽激光器上，利用低温D2靶研究了直接驱动球形内爆的压缩，其强度范围从大约3×10(14)到大约1×10(15)W/cm2。激光等离子体不稳定性产生的超热电子产生的硬X射线信号随激光强度的增大而增大，而面密度则减小。通过将激光强度降低到大约3x10(14)W/cm2来减少热电子的产生，可以产生大约140 mg/cm2的面密度，这与一维模拟很好地一致。这些结果将被考虑在未来的直接驱动点火设计中。
The compression of direct-drive, spherical implosions is studied using cryogenic D2 targets on the 60-beam, 351-nm OMEGA laser with intensities ranging from approximately 3x10(14) to approximately 1x10(15) W/cm2. The hard-x-ray signal from hot electrons generated by laser-plasma instabilities increases with laser intensity, while the areal density decreases. Mitigating hot-electron production, by reducing the laser intensity to approximately 3x10(14) W/cm2, results in areal density of the order of approximately 140 mg/cm2, in good agreement with 1D simulations. These results will be considered in future direct-drive-ignition designs.