[其它]91 LINEAR ANALYSIS AND 3D HYBRID SIMULATION STUDY OF Z-PINCH INSTABILITIES IN THE PRESENCE

LINEAR ANALYSIS AND 3D HYBRID SIMULATION STUDY OF Z-PINCH INSTABILITIES IN THE PRESENCE OF NON - IDEAL MHD EFFECTS* l}lIi8  
V. I. Sotnikov, L. Wanex, B. S. Bauer, I. Paraschiv
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UNR, Reno, NV 89557 USA '_$uW&{NI  
J. N. Leboeuf VV9_`myN7  
UCLA, Los Angleles, CA 90095 USA nM0[P6p  
P. Hellinger, P. Travnicek and V. Fiala Q(\4]i< S  
UFA, Prague 4, Czech Republic }@^4,FKJ  
Abstract %bdjBa}  
The development of z-pinch instabilities in the ?Sb8@S&J  
presence of the Hall term, finite Larmor radius effects 0]jA<vLR  
(FLR), and axial magnetic field is being investigated. >N.]|\V  
The linear stage of instability development is studied with Y!T %cTK)a  
linearized magnetohydrodynamic (MHD) equations &RTX6%'KY  
based on the Hall fluid model. Results for linear growth =k oSUVO0  
rates as a function of axial sheared flow, axial magnetic v$ub~Q6W  
field, and the Hall term,with an emphasis on the sausage ;IpT} ,  
and kink instabilities, are reported. gy;+_'.j  
We also present simulations performed with the 3D 5P'p2x#U  
version of the hybrid code based on the CAM-CL &wB\ ~Ie-  
algorithm [1]. These simulations serve the dual purpose 1\r|g2Z :  
of comparing with the linear Hall MHD analysis and of %/rMg"f:  
investigating the nonlinear stage of instability K_ci_g":  
development with a kinetic model. The overall aim is to MW+b;0U`#  
characterize the combined influence of sheared axial xrN &N_K#  
flow, the Hall term, axial magnetic field, and finite t>uN'oCyC  
Larmor radius (FLR) effects on the development of 41_SRh7N  
sausage and kink modes. RAp=s

  
Calculations have been carried out in several regimes "hQ_sgz[Z  
with respect to the Hall parameter ε = c/ωpir0 (c is the ai0Ut  
speed of light, ωpi is the ion plasma frequency and r0 is ":nQgV\9  
the plasma radius), with and without axial magnetic field. "{D|@
Bc  
The axial magnetic field used in the calculations has been NVl [kw  
varied from B0z = 0 to B0z = 0.5, where the amplitude of 0Ld@H)  
the axial magnetic field is measured relative to the X~xd/M=9^  
azimuthal magnetic field created by the axial current in ]K*8O<  
the z-pinch. SnYLdwgl  
We have also initiated 3D hybrid simulations to study wWXD\{Hk  
the time development of density and magnetic field E~kG2x{a  
profiles produced in the process of long pulse Z-pinch 8#
&q$kE  
implosions in Saturn [2]. The 3D hybrid code allows for 1LY8Ma]E  
multiple ion species with multiple charges. This code also HQ9X7[3  
contains term with finite resistivity in the magnetic field EbZdas!l  
equation. We can thus model realistic wire array loads O MX-_\")  
with wires composed of different materials, for example uZi.HG{<)  
Al (95%) and Mg (5%), like in Saturn. Tb1U^E:  
9TAj) {U%'  
14th IEEE International Power Conference全文数据，part 01 - part 16 Mzd[fR5a8  
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http://www.rayfile.com/files/0d04b3d4-a63b-11dd-b4e8-0014221b798a/ (7DXRcr<  
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http://www.rayfile.com/files/7056586e-a63b-11dd-9dbe-0014221b798a/ !SKV!xH9  
http://www.rayfile.com/files/a50ff68c-a63b-11dd-a055-0014221b798a/ 4c+$%pq5  
http://www.rayfile.com/files/dabae685-a63b-11dd-83bf-0014221b798a/ UgN28YrW  
http://www.rayfile.com/files/0ee56f80-a63c-11dd-9d0b-0014221b798a/ s[Ur~Wvn  
http://www.rayfile.com/files/3e819f21-a63c-11dd-9b7f-0014221b798a/ /xJqJ_70X  
[url=http://www.rayfile.com/files/a46912f0-a63c-11dd-994a-0019d11a795f/]http://www.rayfile.com/files/a46 .. #*>E*#?t  
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