High Energy Density Physics Experiments With Intense Heavy Ion Beams

Henestroza, E. ; Leitner, M. ; Logan, B.G. ; More, R.M. ; Roy, P.K. ; Ni, P. ; Seidl, P.A. ; Waldron, W.L. ; Barnard, J.J.

Lawrence Berkeley National Laboratory

关键词: 70 Plasma Physics And Fusion Technology;   

DOI  :  10.2172/1051661
RP-ID  :  LBNL-5154E
RP-ID  :  DE-AC02-05CH11231
RP-ID  :  1051661

美国|英语

来源: UNT Digital Library

【 摘 要 】

The US heavy ion fusion science program has developed techniques for heating ion-beam-driven warm dense matter (WDM) targets. The WDM conditions are to be achieved by combined longitudinal and transverse space-charge neutralized drift compression of the ion beam to provide a hot spot on the target with a beam spot size of about 1 mm, and pulse length about 1-2 ns. As a technique for heating volumetric samples of matter to high energy density, intense beams of heavy ions are capable of delivering precise and uniform beam energy deposition dE/dx, in a relatively large sample size, and the ability to heat any solid-phase target material. Initial experiments use a 0.3 MeV K+ beam (below the Bragg peak) from the NDCX-I accelerator. Future plans include target experiments using the NDCX-II accelerator, which is designed to heat targets at the Bragg peak using a 3-6 MeV lithium ion beam. The range of the beams in solid matter targets is about 1 micron, which can be lengthened by using porous targets at reduced density. We have completed the fabrication of a new experimental target chamber facility for WDM experiments, and implemented initial target diagnostics to be used for the first target experiments in NDCX-1. The target chamber has been installed on the NDCX-I beamline. The target diagnostics include a fast multi-channel optical pyrometer, optical streak camera, VISAR, and high-speed gated cameras. Initial WDM experiments will heat targets by compressed NDCX-I beams and will explore measurement of temperature and other target parameters. Experiments are planned in areas such as dense electronegative targets, porous target homogenization and two-phase equation of state.