Dense plasma microfield nonuniformity

Journal Article · Thu May 01 04:00:00 EDT 1997 · Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics

DOI:https://doi.org/10.1103/PhysRevE.55.6289· OSTI ID:503677

Murillo, M S; Kilcrease, D P; Collins, L A ^[1]

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1. Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

Plasma microfield-constrained-average quantities arise in a variety of applications including the ion quadrupole effect, the ion motion problem, and autoionizing processes. We critically compare several methods for computing such quantities in the context of microfield-constrained field gradients, which are used for describing the ion quadrupole effect, a source of spectral line asymmetry. Specifically, we show that one adjustable parameter exponential approximation (APEX)-like theory is divergent and compare existing nearest-neighbor models, APEX, and Monte Carlo results. Moreover, we have performed molecular-dynamics simulations to assess the accuracy of these previous results. Our results indicate that APEX calculations of this particular constrained average are quite accurate except at large field values, which are unimportant for line shapes. Interestingly, nearest-neighbor results are quite accurate for certain field gradients and not for others. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 503677
• Journal Information: Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics, Journal Name: Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics Journal Issue: 5 Vol. 55; ISSN PLEEE8; ISSN 1063-651X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ELECTRIC FIELDS
INHOMOGENEOUS FIELDS
LINE WIDTHS
MOLECULAR DYNAMICS METHOD
MONTE CARLO METHOD
PLASMA
PLASMA DENSITY
PLASMA SIMULATION