Ignition Failure Mode Radiochemical Diagnostics Initial Assessment

Fortner, R ; Bernstein, L ; Cerjan, C ; Haan, S W ; Harding, R ; Hatchett, S ; Hoffman, R ; Koch, J ; Moody, K ; Schneider, D ; Stoyer, M ; Werner, C ; Zimmerman, G

Lawrence Livermore National Laboratory

关键词: Iridium;    Nuclear Reactions;    42 Engineering;    Targets;    Cross Sections;   

DOI  :  10.2172/908127
RP-ID  :  UCRL-TR-230178
RP-ID  :  W-7405-ENG-48
RP-ID  :  908127

美国|英语

来源: UNT Digital Library

【 摘 要 】

Radiochemical diagnostic signatures are well known to be effective indicators of nuclear ignition and burn reaction conditions. Nuclear activation is already a reliable technique to measure yield. More comprehensively, though, important quantities such as fuel areal density and ion temperature might be separately and more precisely monitored by a judicious choice of select nuclear reactions. This report details an initial assessment of this approach to diagnosing ignition failures on point-design cryogenic National Ignition Campaign targets. Using newly generated nuclear reaction cross section data for Scandium and Iridium, modest uniform doping of the innermost ablator region provides clearly observable reaction product differences between robust burn and failure for either element. Both equatorial and polar tracer loading yield observable, but indistinguishable, signatures for either choice of element for the preliminary cases studied.