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[其它]90 MODELING OF THE INVERSE Z-PINCH DYNAMICS *

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0楼发表于: 2008-10-30 13:21:56

MODELING OF THE INVERSE Z-PINCH DYNAMICS *
V. Makhina, A. Esaulov, B.S. Bauer, R.E. Siemon, R. Presura,
V.I. Sotnikov, and I. Paraschiv
University of Nevada, Reno, Mail Stop 220
Reno, Nevada 89557, U.S.A.
I.R. Lindemuth, R.C. Kirkpatrick, and P.T. Sheehey
Los Alamos National Laboratory, Mail Stop B259
Los Alamos, New Mexico 87545, U.S.A.
D.D. Ryutov
Lawrence Livermore National Laboratory, Mail Stop L-630
Livermore, California 94550 , U.S.A.
Abstract
The two-dimensional MHD numerical simulation
MHRDR has been applied to develop and investigate a
new possible fusion scheme, and design experiments to
test it. The confinement of magnetized high-beta plasma
directly by material walls holds considerable promise for
fusion. An interesting prospective Magnetized Target
Fusion (MTF) target plasma is the cylindrical inverse
pinch, which is, in theory, an MHD-stable, self-organized
plasma. An inverse pinch consists of coaxial, metal,
current-carrying cylinders with plasma between them.
Important insight into this plasma has been obtained using
the MHRDR simulation. First, simulations observe that
interchange m=0 modes rearrange the plasma into a
pressure profile that is stable to m=0 (the Kadomtsevstable
profile). Such plasma self-organization is very
encouraging for the development of a robust practical
device, since the pressure profile does not have to be
created in a very particular manner to satisfy the
Kadomtsev criterion. Second, the plasma beta can be
adjusted by using an initial bias current on the central
conductor to magnetize the gas before it is ionized. In
this way, the plasma beta can be kept below 40%, so that,
according to theory, the troublesome m=1 mode is also
stabilized. (The r-z MHRDR code does not analyze the
three-dimensional kink motion.) Although the convection
associated with self-organization enhances thermal
transport, the kinetic energy of turbulent motion is small
compared to the thermal energy, and the energy transport
is globally Bohm-like, which is acceptable for MTF. The
MHRDR modeling is guiding the design of an experiment
on the 2-TW Zebra z-pinch at UNR to test the inversepinch
concept. For the parameters of the designed
experiment, MHRDR simulations predict the 2-MV,
1-MA Marx generator will produce a deuterium plasma
with B ~ 4 T, n ~ 1022 m-3, T ~ 300 eV, and a lifetime of
10-50 microseconds. Understanding of the energy
transport in this simple wall-confined plasma will

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