|icc_2006_poster_fuelling_final_rev2.pdf||2006-03-15 19:23:53||Stephan Fuelling|
Experimental design of a magnetic flux compression experiment*
Author: Stephan Fuelling
Submitted: 2005-12-22 17:49:32
Co-authors: T.J. Awe, B.S. Bauer, T. Goodrich, I.R. Lindemuth, V. Makhin, R.E. Siemon, University of Nevada, Reno, W.L. Atchison, R.E. Reinovsky, Mike A. Salazar, D.W. Scudder, P.J. Turchi, Los Alamos National Laboratory, J.H. Degnan, Air Force Research Laboratory
University of Nevada, Reno
5625 Fox Ave.
Reno, Nevada 89506
Generation of large magnetic fields is an interesting topic of high-energy-density physics, and an essential aspect of Magnetized Target Fusion. An experiment is planned on the Atlas facility at the Nevada Test Site, which will generate magnetic fields in the range of 1-5 MG. An initial toroidal bias magnetic field is provided from current on a hard-core center conductor. Current on the hard core is generated by diverting a fraction of the liner current using an innovative inductive current divider, thus avoiding the need for an auxiliary power supply. A 50-mm-radius cylindrical aluminum liner implodes along glide planes with velocity of about 5 km/s. Liner motion causes electrical closure of the toroidal chamber, after which flux in the chamber is conserved. For a typical choice of parameters, conservation of flux and realistic energy efficiency imply peak compression and liner dwell should occur with 3-mm spacing between the liner and the hard core, and 2-3 MG field depending upon efficiency. The mechanical design is performed in collaboration with Los Alamos National Laboratory using the solid modeling software ‘Inventor’ (AutoDesk). Diagnostics include B-dot probes, Faraday rotation, radiography, filtered photodiodes, and VUV spectroscopy. Optical access to the chamber is provided through small holes in the walls. In the MG regime, blackbody radiation is expected from plasma generated on the liner and hard core surfaces because of Ohmic heating (see adjacent poster on numerical modeling). The experimental plan includes initial tests at the Air Force Research Laboratory using Shiva Star and then full-energy tests on Atlas.
* Work supported by DOE OFES grant DE-FG02-04ER54752.