Shilpa Regan

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Radial profiles of nuclear burn in directly-driven, inertial-confinement-fusion implosions have been systematically studied for the first time using a proton emission imaging system sensitive to energetic 14.7-MeV protons from the fusion of deuterium (D) and 3-helium (3 He) at the OMEGA laser facility [T. R. Experimental parameters that were varied include(More)
Thomson scattering of laser light is one of the most fundamental diagnostics of plasma density, temperature and magnetic fields. It relies on the assumption that the properties in the probed volume are homogeneous and constant during the probing time. On the other hand, laboratory plasmas are seldom uniform and homogeneous on the temporal and spatial(More)
Radiation-driven, low-adiabat, cryogenic DT layered plastic capsule implosions were carried out on the National Ignition Facility (NIF) to study the sensitivity of performance to peak power and drive duration. An implosion with extended drive and at reduced peak power of 350 TW achieved the highest compression with fuel areal density of ~1.3±0.1 g/cm2,(More)
Direct-drive implosions with 20-microm-thick glass shells were conducted on the Omega Laser Facility to test the performance of high-Z glass ablators for direct-drive, inertial confinement fusion. The x-ray signal caused by hot electrons generated by two-plasmon-decay instability was reduced by more than approximately 40x and hot-electron temperature by(More)
The films of Walt Disney have served as icons of childhood over the last century. The Disney Corporation's success is evidenced in its financial fortitude. In 1995, Walt Disney Company had the biggest market share, relative Disney had sales of nearly $24 billion. This made Disney the world's second largest media firm behind Time Warner. As of mid-2007,(More)
Direct drive implosions of targets filled with different mixtures of D 2 and 3 He gas on the OMEGA laser system [T.R. Boehly et al., Opt. Commun. 133, 495 (1997)] have shown an unexpected scaling of experimental nuclear yields. At temperatures above a few eV, D 2 and 3 He gasses are fully ionized; and hydrodynamically-equivalent fuels with different ratios(More)
A proton emission imaging system has been developed and used extensively to measure the nuclear burn regions in the cores of inertial confinement fusion implosions. Three imaging cameras, mounted to the 60-beam OMEGA laser facility [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)], use the penetrating 14.7-MeV protons produced from D 3 He fusion reactions(More)
Target areal density (rhoR) asymmetries in OMEGA direct-drive spherical implosions are studied. The rms variation <deltarhoR>/<rhoR> for low-mode-number structure is approximately proportional to the rms variation of on-target laser intensity <deltaI>/<I> with an amplification factor of approximately 1/2(C(r)-1), where C(r) is the capsule convergence ratio.(More)
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