Progress in Measurements of the Electrical Conductivity of Metal Plasmas

DeSilva, A.W.; Rakhel, A. D.

doi:10.1002/ctpp.200510026

Cited by 38 publications

(22 citation statements)

References 15 publications

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“…Experimental data that can serve for the purpose of comparison are available mainly in the low temperature (10000-30000 Kelvin) region. Measured data of electrical conductivities in aluminum and copper plasmas were reported by DeSilva and Katsouros [13], of iron and of other metal plasmas by DeSilva and Rakhel [14]. We show calculated electrical and thermal conductivities as a function of density at 10000 K (0.8617 eV) temperature on Figures 11,12 and 13 for aluminum, iron and copper.…”

Section: Computationsmentioning

confidence: 63%

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Electron scattering in hot/warm plasmas

Rozsnyai

2008

High Energy Density Physics

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Abstract. Electrical and thermal conductivities are presented for aluminum, iron and copper plasmas at various temperatures, and for gold between 15000 and 30000 Kelvin. The calculations are based on the continuum wave functions computed in the potential of the temperature and density dependent self-consistent 'average atom' (AA) model of the plasma. The cross sections are calculated by using the phase shifts of the continuum electron wave functions and also in the Born approximation. We show the combined effect of the thermal and radiative transport on the effective Rosseland mean opacities at temperatures from 1 to 1000 eV. Comparisons with low temperature experimental data are also presented. I. Introduction.The objective of this paper is to show the effects of the details of electron scattering cross sections on the transport properties of plasmas. The key element is the electron momentum transfer cross section that enters into the formulas for both the electrical and thermal conductivities. The potential in which the electrons scatter is a basic element and that is taken as an input from the author's temperature and density dependent self-consistent model for the plasma [1], that was also used for the computation of radiative properties [2,3,4]. For the computation of the electrical resistivity we use the Ziman formula [5,6,7], whereas for the thermal conductivity we adopt the method of L. Mestel [8,9]. No restrictions are made for the degree of degeneracy of the electron gas, so our model is applicable for any temperature and density. However, the continuum wave functions of the scattering states are computed by the non-relativistic Schrodinger equation, even if the self-consistent potential is based on the DiracSlater model. The ratio of the small/large components of the Dirac equation is of the order of

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Section: Computationsmentioning

confidence: 63%

“…The radiative part in a Planckian radiation field is given by (14) where ) (! " is the frequency dependent photoabsorption cross section.…”

Section: Theorymentioning

confidence: 99%

Electron scattering in hot/warm plasmas

Rozsnyai

2008

High Energy Density Physics

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“…In this work, we calculate the electrical conductivities of iron and nickel plasmas for their partially ionized conditions, using the nonideal plasma ionization balance model derived based on the excess free energy fitting formulae given by Tanaka, Mitake, and Ichimaru [16] and Chabrier and Potekhin [17] and then compare the results with available data measured in underwater capillary wire discharge experiments [18] which adequately exhibit the characteristic insulator-metal transitions near the critical density level, i.e., ρ ∼ 1 g/cm 3 .…”

Section: Introductionmentioning

confidence: 99%

Electrical Conductivities of Nonideal Iron and Nickel Plasmas

Kim

2007

Contrib. Plasma Phys.

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Electrical conductivities of iron and nickel plasmas are calculated using a nonideal plasma ionization balance model that takes into account the excess free energy due to strong Coulomb couplings between charged particles in the pressure-ionization regime. The electrical conductivities calculated for partially ionized plasmas are in fair agreement with data measured in exploding wire discharge experiments and effectively demonstrate the insulator-metal transition near solid densities.

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“…A number of recent studies have been undertaken on exploding wire plasmas (1)(2)(3)(4)(5). The interest in these plasmas is related to sophisticated phenomena associated with their formation at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…Since graphite electrodes are widely used and carbon plasmas form necessarily whenever an arc is struck with such an electrode, a study of carbon conductivity may be of industrial, military, and basic scientific interest. Although the conductivity of dense metal plasmas has been extensively studied and reported (1)(2)(3)(4)(5)(6)(7)(8)(9)(10), the conductivity of carbon in the plasma state has received less attention (11), perhaps due to the difficulty in preparing plasmas of carbon for study. This report studies the electrical conductivity of nearly pure carbon plasma for densities ranging from about 60% of solid density down to almost 2 orders of magnitude less.…”

Section: Introductionmentioning

confidence: 99%

Electrical Conductivity Measurement of Nonideal Carbon Plasma

Vunni¹,

DeSilva²

2008

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Approved for public release; distribution is unlimited.ii REPORT DOCUMENTATION PAGE Form Approved OMB No. 0704-0188Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY) August 20082. REPORT TYPE PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) U.S. Army Research Laboratory ATTN: AMSRD-ARL-WM-TE Aberdeen Proving Ground, MD 21005-5069 PERFORMING ORGANIZATION REPORT NUMBER ARL-TR-4551 SPONSOR/MONITOR'S ACRONYM(S) 9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) SPONSOR/MONITOR'S REPORT NUMBER(S) DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution is unlimited. SUPPLEMENTARY NOTES* Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, MD 20742 ABSTRACTThe electrical conductivity of carbon plasmas is measured in the range of densities from 0.16 solid density down to about 0.05 solid density and reported for values of internal energy ranging from 4 to 22 kJ/g. Plasmas are formed by rapid electrical discharge through thin graphite fibers immersed in a water bath. The pressure in the expanding plasma column is determined by a hydrodynamic model to describe the effect on the water surround. At constant internal energy per unit mass U, conductivity σ varies with specific volume V as σ = V α , where α is about 1.2 for U 6 kJ/g < , and rises to about 1.5 for U = 22 kJ/g. SUBJECT TERMSplasma, electrical conductivity, carbon, energy, temperature

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Progress in Measurements of the Electrical Conductivity of Metal Plasmas

Cited by 38 publications

References 15 publications

Electron scattering in hot/warm plasmas

Electron scattering in hot/warm plasmas

Electrical Conductivities of Nonideal Iron and Nickel Plasmas

Electrical Conductivity Measurement of Nonideal Carbon Plasma

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