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Progress on compression of FRC’s

Author: James H. Degnan
Requested Type: Poster Only
Submitted: 2006-12-18 13:40:31

Co-authors: A. Brown (2), T.Cavazos (1), S.K.Coffey (2), M. Domonkos, M.Frese (2), S. Frese (2), D.Gale (1), C.Gilman (1), C. Grabowski (1), T.P.Intrator (3), R.Kirkpatrick (3), G.F.Kiuttu, F.M.Lehr, J. V. Parker (1), R.E.Peterkin, Jr (1), N.F.Roderick (4), E.L.Ruden

Contact Info:
Air Force Research Laboratory, Directed Energy Dir
3550 Aberdeen SE
Kirtland AFB, NM   87117-5

Abstract Text:
Magnetized Target Fusion (MTF) is a means to compress plasmas to fusion conditions that uses magnetic fields to greatly reduce electron thermal conduction, thereby greatly reducing compression power density requirements (1, 2). The compression is achieved by imploding the boundary, a metal shell. This effort pursues formation of the Field Reversed Configuration (FRC) type of magnetized plasma, and implosion of the metal shell by means of magnetic pressure from a high current flowing through the shell.

We reported previously that we had shown experimentally (3) that we can use magnetic pressure from high current capacitor discharges to implode long cylindrical metal shells (liners) with size, symmetry, implosion velocity, and overall performance that is suitable for compression of Field Reversed Configurations (FRC’s). We also presented considerations of using deformable liner – electrode contacts of Z-pinch geometry liners or theta pinch driven liners, in order to have axial access to inject FRC’s and to have axial diagnostic access. Since then, we have experimentally implemented the Z-pinch discharge driven deformable liner – electrode contact, obtained full axial coverage radiography of such a liner implosion, and obtained 2D-MHD simulations for a variety of profiled thickness long cylindrical liners. The radiographic results indicate that at least 16 times radial compression of the inner surface of a 0.11 cm thick Al liner was achieved, with a symmetric implosion free of instability growth. We have also made progress in combining 2D-MHD simulations of FRC formation with imploding liner compression of FRC’s. These indicate that capture of the injected FRC by the imploding liner can be achieved with suitable relative timing of the FRC formation and liner implosion discharges.

(1) K.F.Schoenberg, R.E. Siemon et al, LA-UR-98-2413, 1998
(2) J. M. Taccetti, T. P. Intrator, G. A. Wurden et al, Rev. Sci. Instr. 74, 4314 (2003).
(3) J.H.Degnan et al, IEEE Transactions on Plasma Science 29, p.93-98 (2001).

This research was sponsored by DOE-OFES.

Characterization: C

Placement: The AFRL abstracts on MTF include posters by Grabowski et al, Degnan et al, Frese et al, and Ruden et al. Placing them in that order will be best. Place near related LANL posters.

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