Beryllium liner implosion experiments on the Z accelerator in preparation for magnetized liner inertial fusiona)

摘要: Multiple experimental campaigns have been executed to study the implosions of initially solid beryllium (Be) liners (tubes) on Z pulsed-power accelerator. The were driven by current pulses that rose from 0 20 MA in either 100 or 200 ns (200 ns for pulse shaping experiments). These studies conducted support recently proposed Magnetized Liner Inertial Fusion concept [Slutz et al., Phys. Plasmas 17, 056303 (2010)], as well exploring novel equation-of-state measurement techniques. experiments used thick-walled had an aspect ratio (initial outer radius divided initial wall thickness) 3.2, 4, 6. From these studies, we present three new primary results. First, radiographic images imploding Be liners, where each liner contained a thin aluminum sleeve enhancing contrast and visibility liner's inner surface images. allow us assess stability more accurately directly than was previously possible. Second, taken early implosion (prior any motion surface) shockwave propagating radially inward through wall. Radial mass density profiles shock compression are contrasted with accelerator's capabilities achieve shockless (“quasi-isentropic”) compression. Third, “micro-B” measurements azimuthal magnetic field penetration into vacuum-filled interior shocked liner. Our simulations reveal commences shortly after breaks out surface. then accelerates this low-density “precursor” plasma axis symmetry.