X-RAY AND DEBRIS EMISSION FROM DIRECT AND INDIRECT NATIONAL IGNITION FACILITY TARGETS

The emission of x rays and debris ions by the National Ignition Facili ty direct and indirect targets are compared in this paper. In the indi rect drive targets, the fuel capsule is surrounded by a gold case, whi ch filters out all but the hardest x rays from the capsule and collide s with the capsule debris, generating large amounts of colder x rays t hat leave the target through laser entrance holes. The direct drive ta rgets have no such case, so the debris and x rays from the capsule are un-obscured. Computer simulations of both targets demonstrate these d ifferences.