R. Cook et al., PRODUCTION AND CHARACTERIZATION OF DOPED MANDRELS FOR INERTIAL-CONFINEMENT FUSION EXPERIMENTS, Journal of vacuum science & technology. A. Vacuum, surfaces, and films, 12(4), 1994, pp. 1275-1280
Citations number
13
Categorie Soggetti
Physics, Applied","Materials Science, Coatings & Films
A key feature of current inertial-confinement fusion (ICF) experiments
is the incorporation of dopant atoms into the thin polymer microshell
which, in a finished ICF capsule, forms its inner wall. These dopants
provide a spectroscopic signal during the implosion that can be used
to diagnose the degree of mix at the capsule-fuel interface. The high-
Z dopants can also be used to directly image the fuel-pusher interface
. The current status of doped mandrel development is reviewed, with a
focus on the mandrel surface smoothness. With the development of uniqu
e surface mapping characterization tools which will be described, it h
as been discovered that mandrel surface smoothness is a function of th
e polymers used to form the mandrels. In this report it will be shown
that Cl-doped mandrels produced from a blend of polystyrene and poly(p
-chlorostyrene) are rough on a length scale of 10's of microns with am
plitudes of as much as a 100 nm. The origin of this roughness will be
discussed, and it will be shown that this roughness can be removed by
using a copolymer rather than a blend of two polymers. Also it will be
shown how Cr-doped mandrels become rough with age due to ambient ligh
t exposure.