注意：国家点火装置低温内爆中燃料和烧蚀层面密度的放射化学测量。

Note: Radiochemical measurement of fuel and ablator areal densities in cryogenic implosions at the National Ignition Facility.

作者信息

Hagmann C, Shaughnessy D A, Moody K J, Grant P M, Gharibyan N, Gostic J M, Wooddy P T, Torretto P C, Bandong B B, Bionta R, Cerjan C J, Bernstein L A, Caggiano J A, Herrmann H W, Knauer J P, Sayre D B, Schneider D H, Henry E A, Fortner R J

机构信息

Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.

Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

出版信息

Rev Sci Instrum. 2015 Jul;86(7):076105. doi: 10.1063/1.4926743.

DOI:10.1063/1.4926743

PMID:26233419

Abstract

A new radiochemical method for determining deuterium-tritium (DT) fuel and plastic ablator (CH) areal densities (ρR) in high-convergence, cryogenic inertial confinement fusion implosions at the National Ignition Facility is described. It is based on measuring the (198)Au/(196)Au activation ratio using the collected post-shot debris of the Au hohlraum. The Au ratio combined with the independently measured neutron down scatter ratio uniquely determines the areal densities ρR(DT) and ρR(CH) during burn in the context of a simple 1-dimensional capsule model. The results show larger than expected ρR(CH) values, hinting at the presence of cold fuel-ablator mix.

摘要

描述了一种新的放射化学方法，用于测定国家点火设施中高收敛、低温惯性约束聚变内爆中的氘 - 氚（DT）燃料和塑料烧蚀层（CH）的面密度（ρR）。该方法基于测量使用收集到的金黑腔射击后碎片的（198）Au/（196）Au活化比。在简单的一维胶囊模型的背景下，Au比与独立测量的中子向下散射比相结合，唯一地确定了燃烧期间的面密度ρR（DT）和ρR（CH）。结果显示ρR（CH）值高于预期，这暗示了冷燃料 - 烧蚀层混合的存在。