Download Investigation of a magnetic flux compression by plasma liner.

XXX conference on plasma physics and CF, February 24 – 28, 2003, Zvenigorod
INVESTIGATION OF A MAGNETIC FLUX COMPRESSION BY PLASMA LINER.
V.A. Gasilov, A.S. Chuvatin*, A.Yu. Kroukovskii, E.L. Kartasheva, O.G. Olkhovskaya,
A.S. Boldarev, D.S. Tarasov, N.V. Serova, S.V. D’yachenko, O.V. Fryazinov
Institute for mathematical modeling, RAS
*
CNRS, Ecole Polytechnique, France
The use of Inductive Energy Storage (IES) is a perspective method of intensive pulsed magnetic
field generation. According to this technique, the initial magnetic energy concentration is done in
some vacuum chamber. The appropriate volume is about 103 cm 3 and concentration time is about
1-1000 μs [1]. A further magnetic energy concentration up to the volume 1-100 cm3 and a power
growth can be done by various techniques like magnetic field compression by explosive magnetic
generators [2], plasma switch [3], exploding foils and wires [4], plasma breakers of current [5]. The
schemes [3], [4], and [5] are able to reduce the pulse duration up to ~ 0.1 µs.
The most complex is to make the current pulse shorter than 0.1 µs. For the experimental progress
it’s necessary to increase the current level in the load so it would reach 10-30 MA or more. The
corresponding voltage drop through the load should be higher than 5 MV. The existing power
multiplication schemes do not satisfy such conditions. Therefore at present the new schemes of
power multiplication being designed, and the one new is the scheme based on using the plasma liner
as a driver for a magnetic flux compression (MFC-scheme [6]). This scheme implies the azimuthal
magnetic flux concentration by a plasma shell which is produced by means of multiwire-liner
explosion. For this scheme the estimations show the possible current level ~ 10-100 MA and pulse
duration ~ 1 µс. The increase of a number of wires forming the liner (or the use of thin foils) makes
the plasma shell more homogeneous. In the present work we study the MFC scheme through a set of
numerical models of various complexity.
We study the magnetic flux (MF) losses caused by the liner interior surface deformations due to
Rayleigh-Taylor instability and magnetic field diffusion into the liner. The MF losses are studied
numerically through the MHD code RAZRYAD-2,5, elaborated in IMM RAS. We consider
primarily those problems which relate to the existing generators typically having the current
maximum of about 3 MA. These generators can be used for testing of the FC scheme. The
numerical studies show that the optimized FC scheme possesses rather good parameters and can be
utilized for energy concentration in a generator load system.
A part of the presented work related to the code design was supported by RFBR, project 02-0100708. The numerical simulations were supported by CNRS, France.
References
[1]
[2]
[3]
[4]
[5]
[6]
Megagauss fields and pulsed power systems”, ed. by V.M.Titov and G.A.Shvetsov, Nova
Science Publishers, New York, 1990.
A.I.Pavlovskii, in Proc. 8th IEEE Int. Pulsed Power Conf. (San Diego, CA, June 16-19, 1991),
ed. K.Prestwich and R.White, IEEE Cat. Nomber 91CH3052-8, pp. 1-14.
P.J.Turchi, et al, IEEE Trans. Plasma Sci., PS-15(6), 747-759(1987).
B.M.Koval’chuk et al. Journal of Technical Physics, 1974, v.44, N.1, c215.
IEEE Trans. Plasma Sci. (special issue) PS-15(6), 1987.
J.F.Leon, et al, in Proc. 12th IEEE Int. Pulsed Power Conf. (Monterey, CA, June 27-30,
1999), ed. Ch.Stallings and H.Kirbie, IEEE Cat. Nomber: 99CH36358, 275-278.