Abstract
Spherical expansion of the luminous front around a laser-heated microshell target in 20 Torr of helium is compared with theory in the mass-dependent region. Microshell targets from 74- to 7970-ng initial mass irradiated with up to 0.13 TW (Terawatt) of 1.06-μm light were studied. Effects of the initial mass and changing γ on the front history are discussed. It is concluded that extraction of expansion energy from the front motion is not easily accomplished in this close-in region.
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