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The temporal history of the target areal-density near peak compression of direct-drive spherical target implosions has been inferred with 14.7-MeV deuterium-helium-3 D³He proton spectroscopy of the 60-beam, 30-kJ UV OMEGA laser system. The target areal-density grows by a factor of ~8 during the time of neutron-production (~400 ps) before reaching 123±16 mg/cm² at peak compression in the implosion of a 950-μm-diam, 20-μm-thick plastic CH capsule filled with 4 atm of D³He fuel.
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Smalyuk et al. (2003) studied this question.
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