Frank J. Marshall

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for their project to develop a capacitive sensing mechanism for mapping pressure distribution on the foot. In the past three years, ECE has worked to create a vibrant Ph.D. program at Carnegie Mellon Silicon Valley — the university's campus near San Jose, Calif. More than 35 students now call that program home, working on research projects related to mobile(More)
Enhancement of the ion temperature and fusion yield has been observed in magnetized laser-driven inertial confinement fusion implosions on the OMEGA Laser Facility. A spherical CH target with a 10 atm D2 gas fill was imploded in a polar-drive configuration. A magnetic field of 80 kG was embedded in the target and was subsequently trapped and compressed by(More)
The performance of triple-picket deuterium-tritium cryogenic target designs on the OMEGA Laser System [T. R. Boehly, Opt. Commun. 133, 495 (1997)] is reported. These designs facilitate control of shock heating in low-adiabat inertial confinement fusion targets. Areal densities up to 300 mg/cm2 (the highest ever measured in cryogenic deuterium-tritium(More)
A distinctive way of quantitatively imaging inertial fusion implosions has resulted in the characterization of two different types of electromagnetic configurations and in the measurement of the temporal evolution of capsule size and areal density. Radiography with a pulsed, monoenergetic, isotropic proton source reveals field structures through deflection(More)
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)
F usion ignition and burn may be achieved through inertial confinement fusion (ICF) by compressing tritium (T) and/or deuterium (D) fuel to high enough temperatures (∼10 keV) to initiate fusion reactions, producing high-energy neutrons and α-particles. If assembled properly, with excellent spherical compression symmetry, fuel areal density exceeding ∼1 g cm(More)
Clear evidence of the transition from hydrodynamiclike to strongly kinetic shock-driven implosions is, for the first time, revealed and quantitatively assessed. Implosions with a range of initial equimolar D3He gas densities show that as the density is decreased, hydrodynamic simulations strongly diverge from and increasingly overpredict the observed(More)
The fuel layer density of an imploding laser-driven spherical shell is inferred from framed x-ray radiographs. The density distribution is determined by using Abel inversion to compute the radial distribution of the opacity kappa from the observed optical depth tau. With the additional assumption of the mass of the remaining fuel, the absolute density(More)