Numerical simulations of annular wire-array z-pinches in (x,y), (r,θ), and (r,z) geometries

被引:15
作者
Marder, BM [1 ]
Sanford, TWL [1 ]
Allshouse, GO [1 ]
机构
[1] Sandia Natl Labs, Albuquerque, NM 87185 USA
关键词
D O I
10.1063/1.873024
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
The Total Immersion Particle [B. M. Marder, Math. Comput. 29, 434 (1973)] code has been used in several two-dimensional geometries to understand better the measured dynamics of annular, aluminum wire-array z-pinches. The areas investigated include the formation of the plasma sheath from current-induced individual wire explosions, the effects of wire number and symmetry on the implosion dynamics, and the dependence of the Rayleigh-Taylor instability growth on initial sheath thickness. A qualitative change in the dynamics with increasing wire number was observed, corresponding to a transition between a z-pinch composed of nonmerging, self-pinching individual wires, and one characterized by the rapid formation and subsequent implosion of a continuous plasma sheath. A sharp increase in radiated power with increasing wire number has been observed experimentally near this calculated transition. Although two-dimensional codes have correctly simulated observed power pulse durations, there are indications that three-dimensional effects are important in understanding the actual mechanism by which these pulse lengths are produced. (C) 1998 American Institute of Physics.
引用
收藏
页码:2997 / 3005
页数:9
相关论文
共 14 条
[1]  
Bloomquist D. D., 1987, P 6 IEEE PULS POW C, P310
[2]   Effect of sheath curvature on Rayleigh-Taylor mitigation in high-velocity uniform-fill, Z-pinch implosions [J].
Douglas, MR ;
Deeney, C ;
Roderick, NF .
PHYSICAL REVIEW LETTERS, 1997, 78 (24) :4577-4580
[3]   Two-dimensional radiation-magnetohydrodynamic simulations of SATURN imploding Z pinches [J].
Hammer, JH ;
Eddleman, JL ;
Springer, PT ;
Tabak, M ;
Toor, A ;
Wong, KL ;
Zimmerman, GB ;
Deeney, C ;
Humphreys, R ;
Nash, TJ ;
Sanford, TWL ;
Spielman, RB ;
DeGroot, JS .
PHYSICS OF PLASMAS, 1996, 3 (05) :2063-2069
[4]   GAP - PIC-TYPE FLUID CODE [J].
MARDER, BM .
MATHEMATICS OF COMPUTATION, 1975, 29 (130) :434-446
[5]   CORONAL EQUILIBRIUM OF HIGH-ATOMIC-NUMBER PLASMAS [J].
MOSHER, D .
PHYSICAL REVIEW A, 1974, 10 (06) :2330-2335
[6]  
MOSHER D, 1993, COMMUNICATION
[7]   Two-dimensional modeling of magnetically driven Rayleigh-Taylor instabilities in cylindrical Z pinches [J].
Peterson, DL ;
Bowers, RL ;
Brownell, JH ;
Greene, AE ;
McLenithan, KD ;
Oliphant, TA ;
Roderick, NF ;
Scannapieco, AJ .
PHYSICS OF PLASMAS, 1996, 3 (01) :368-381
[8]  
PETERSON DL, 1997, P 4 INT C VANC BC CA, V409
[9]   Dynamics of a high-power aluminum-wire array Z-pinch implosion [J].
Sanford, TWL ;
Nash, TJ ;
Mock, RC ;
Spielman, RB ;
Struve, KW ;
Hammer, JH ;
DeGroot, JS ;
Whitney, KG ;
Apruzese, JP .
PHYSICS OF PLASMAS, 1997, 4 (06) :2188-2203
[10]   Improved symmetry greatly increases X-ray power from wire-array Z-pinches [J].
Sanford, TWL ;
Allshouse, GO ;
Marder, BM ;
Nash, TJ ;
Mock, RC ;
Spielman, RB ;
Seamen, JF ;
McGurn, JC ;
Jobe, D ;
Gilliland, TL ;
Vargas, M ;
Struve, KW ;
Stygar, WA ;
Douglas, MR ;
Matzen, MK ;
Hammer, JH ;
DeGroot, JS ;
Eddleman, JL ;
Peterson, DL ;
Mosher, D ;
Whitney, KG ;
Thornhill, JW ;
Pulsifer, PE ;
Apruzese, JP ;
Maron, Y .
PHYSICAL REVIEW LETTERS, 1996, 77 (25) :5063-5066