An approximate quantitative analysis of non-equilibrium plasma transport for high density plasmas

Schram, DC Daan; Haas, de Jcm; Mullen, van der Jjam Joost; Sanden, van de Mcm Richard

doi:10.1007/bf01512625

Cited by 9 publications

(8 citation statements)

References 14 publications

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“…In this section we use an alternative description in which the plasma pressure, the ionization degree ͑or electron density͒ and two nonequilibrium parameters, b 1 and conform Schram et al,7 b 1 ϭ n a n s and ⌰ϭ T h T e , are used. Note that in local thermodynamic equilibrium b 1 and are both equal to one.…”

Section: B the Monoatomic Plasma In Non-ltementioning

confidence: 99%

“…In this paper we used an alternative description in which the plasma pressure, the ionization degree ͑or electron density͒ and two nonequilibrium parameters, b 1 and conform Schram et al 7 are used. In the alternative description we make use of the lack of pressure influence on the heat capacities and on the isentropic exponent, and of the relatively weak dependence of the isentropic exponent on the electron temperature together with the small range of relevant electron temperatures over which a plasma can exist.…”

Section: ͑41͒mentioning

confidence: 99%

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The isentropic exponent in plasmas

1999

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The isentropic exponent for gases is a physical quantity that can ease significantly the hydrodynamic modeling effort. In gas dynamics the isentropic exponent depends only on the number of degrees of freedom of the considered gas. The isentropic exponent for a plasma is lower due to an extra degree of freedom caused by ionization. In this paper it will be shown that, like for gases, the isentropic exponent for atomic plasmas is also constant, as long as the ionization degree is between 5%-80%. Only a very weak dependence on the electron temperature and the two nonequilibrium parameters remain. An argon plasma is used to demonstrate the behavior of the isentropic exponent on the plasma conditions, and to make an estimation of the value of the isentropic exponent of a customary plasma. For atmospheric plasmas, which usually have an electron temperature of about 1 eV, a sufficiently accurate estimate for the isentropic exponent of plasmas is 1.16.

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Section: B the Monoatomic Plasma In Non-ltementioning

confidence: 99%

Section: ͑41͒mentioning

confidence: 99%

The isentropic exponent in plasmas

1999

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“…Flexible approximate simulation of a thermal plasma (F.A.S.T.) is a thermal plasma simulation tool that uses the electron density and total pressure of the plasma as its main parameters and is based on the approximate modelling scheme as introduced by Schram [20]. A thermal plasma can be best characterized by the electron density which can vary orders of magnitude between different parts of the plasma, while at the same time, the electron temperature varies only slightly, typically less than a factor of two.…”

Section: Flexible Approximate Simulation Of a Thermal Plasmamentioning

confidence: 99%

“…In a thermal plasma at super-atmospheric pressure as in the cascaded arc, a good assumption generally is = 1, which is implemented in the current simulation. The overpopulation of the argon atoms in the ground level is expressed as b 1 = 1.3 + 10 22 /n e , where we follow [20].…”

Section: Flexible Approximate Simulation Of a Thermal Plasmamentioning

confidence: 99%

“…Besides an experimental characterization of the produced light beam from a conventional and profiled cascaded arc operated in argon, we present in this paper an extremely fast, flexible and accurate modelling scheme to investigate the optimum geometry of the arc channel. This method has been introduced in [20,21] and is implemented here as Flexible approximate simulation of a thermal plasma (F.A.S.T. ).…”

Section: Introductionmentioning

confidence: 99%

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A new design of a bright cascaded arc light source: measurements and simulations

Zijlmans¹,

Schram²,

Engeln³

2007

J. Phys. D: Appl. Phys.

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Profiling the arc channel of a cascaded arc into an hourglass-like shape results in an extremely high light output intensity (3.5 × 1012 Wm−2 m−1 sr−1 in the near-infrared) at an input power of 2.2 kW, a good stability (better than 5 × 10−4) and a small solid angle of the emitted light beam (Ω = 0.015 sr). These optical properties are advantageous for spectroscopic applications that require a high light intensity over a broad wavelength range in a small solid angle. The absolute light output is measured and is compared with a fast and flexible modelling scheme. These simulations are used to verify the arc performance and to guide arc design. The calculated emitted radiance at moderate arc input power agrees with the experiments within 30% for moderate input power.

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Deviations from thermal equilibrium in plasmas

Burm¹

2004

Physics Letters A

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An approximate quantitative analysis of non-equilibrium plasma transport for high density plasmas

Cited by 9 publications

References 14 publications

The isentropic exponent in plasmas

The isentropic exponent in plasmas

A new design of a bright cascaded arc light source: measurements and simulations

Deviations from thermal equilibrium in plasmas

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