Attainment of large ion Larmor radius (LLR) conditions in a compressional Z-pinch

1998 ◽  
Vol 26 (4) ◽  
pp. 1208-1209 ◽  
Author(s):  
M.G. Haines ◽  
N.G. Kassapakis
Keyword(s):  
Larmor Radius ◽  
Z Pinch

Linear stability of the collisionless, large Larmor radius Z-pinch

1997 ◽  
Vol 4 (7) ◽  
pp. 2322-2330 ◽  
Author(s):  
P. G. F. Russell ◽  
T. D. Arber ◽  
M. Coppins ◽  
J. Scheffel
Keyword(s):  
Linear Stability ◽  
Larmor Radius ◽  
Z Pinch

One-dimensional hybrid simulations of the imploding large Larmor radius Z pinch

1999 ◽  
Vol 6 (10) ◽  
pp. 3890-3897 ◽  
Author(s):  
S. W. Channon ◽  
M. Coppins ◽  
T. D. Arber
Keyword(s):  
Larmor Radius ◽  
One Dimensional ◽  
Z Pinch ◽  
Hybrid Simulations

Linear Stability of the Large Larmor Radius Z-Pinch

1994 ◽  
Author(s):  
Jan Scheffel ◽  
Tony Arber ◽  
Michael Coppins ◽  
Malcolm Haines ◽  
Andrew Knight
Keyword(s):  
Linear Stability ◽  
Larmor Radius ◽  
Z Pinch

On the Vlasov fluid stability of the m = 0 mode in a pure Z pinch

1984 ◽  
Vol 32 (1) ◽  
pp. 1-5 ◽  
Author(s):  
M. Coppins ◽  
D. J. Bond ◽  
M. G. Haines
Keyword(s):  
Comparison Theorem ◽  
Fluid Model ◽  
Larmor Radius ◽  
Z Pinch

The possibility of using the Vlasov fluid model to describe large ion Larmor radius effects in a Z pinch is discussed. It is shown that the Vlasov fluid formulation can be applied to the m = 0 mode, but the comparison theorem which states that systems which are MHD stable are also Vlasov fluid stable, is shown to be inapplicable in this case.

Effects of compressibility on the finite Larmor radius stabilized Rayleigh–Taylor instability in Z-pinch implosions

2008 ◽  
Vol 15 (2) ◽  
pp. 022103 ◽  
Author(s):  
L. Huang ◽  
G. D. Jian ◽  
X. M. Qiu ◽  
X. D. Peng ◽  
S. Q. Wang
Keyword(s):  
Taylor Instability ◽  
Larmor Radius ◽  
Finite Larmor Radius ◽  
Rayleigh Taylor Instability ◽  
Z Pinch

scholarly journals Fiber Z-pinch experiments and calculations in the finite Larmor radius regime

1996 ◽  
Vol 14 (2) ◽  
pp. 261-271 ◽  
Author(s):  
M.G. Haines ◽  
A.E. Dangor ◽  
M. Coppins ◽  
P. Choi ◽  
I.H. Mitchell ◽  
...  
Keyword(s):  
Short Pulse ◽  
Hydrogen Plasma ◽  
Energetic Electron ◽  
Larmor Radius ◽  
Lower Hybrid ◽  
Radial Expansion ◽  
X Ray ◽  
Finite Larmor Radius ◽  
Neutron Burst ◽  
Z Pinch

The dense Z-pinch project at Imperial College is aimed at achieving radiative collapse to high density in a hydrogen plasma, and also to study plasmas close to controlled fusion conditions. To this end, the MAGPIE generator (2.4 MV, 1.25, and 200 ns) has been built and tested, and is now giving preliminary experimental data at 60% of full voltage for carbon and CD2 fibers. These discharges are characterized by an initial radial expansion followed by the occurrence of m = 0 structures with transient X-ray emission from bright spots. Late in the discharge a disruption can occur, accompanied by hard X-ray emission from the anode due to an energetic electron beam and, in the case of CD2 fibers, a neutron burst. Concomitant theoretical studies have solved the linear stability problem for a Z-pinch with large ion Larmor radii, showing that a reduction in growth rate of m = 0 and m = 1 modes to about 20% of the magnetohydrodynamic (MHD) value can occur for a parabolic density profile when the Larmor radius is optimally 20% of the pinch radius. Two dimensional MHD simulations of Z-pinches in two extremes of focussed short-pulse laserplasma interactions and of galactic jets reveal a nonlinear stabilizing effect in the presence of sheared flow. One-dimensional simulations show that at low line density the lower hybrid drift instability can lead to coronal radial expansion of a Z-pinch plasma.

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