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Alternative irradiation schemes for NIF and LMJ hohlraums

机译:NIF和LMJ HOHLRAUMS的替代辐照方案

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We explore two alternative irradiation schemes for the large ('outer') and small ('inner') angle beams that currently illuminate National Ignition Facility (NIF) and Laser Megajoule cavities. In the first, while the outer laser beams enter through the usual end laser entrance holes (LEH), the inner beams enter through slots along the cavity axis wall, illuminating the back wall of the cavity. This avoids the current interaction of the inner laser beams with the gold wall bubbles generated by the outer beams, which leads to large time-dependent changes in drive symmetry. Another scheme potentially useful for NIF uses only the outer beams. The radiative losses through the slots or from the use of outer beams only are compensated by using a smaller cavity and LEH.
机译:我们探索了当前照亮国家点火设施(NIF)和激光Megajoule洞穴的大('外')和小('内部')和小('内部')角度梁的两个替代辐照方案。 在第一时,虽然外激光束通过通常的端部激光入口孔(LEH)进入,但内梁通过沿着腔轴壁的槽进入,照射腔的后壁。 这避免了内激光束与由外梁产生的金壁气泡的电流相互作用,这导致驱动对称的大的时间变化。 可能仅适用于NIF的另一个方案仅使用外梁。 通过使用较小的空腔和LEH仅通过槽或使用外梁的辐射损耗。

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