Simulations of geometrically pinched argon plasmas using an extended one-dimensional model

Burm, Ktal Karel; Goedheer, W. J.; Schram, DC Daan

doi:10.1088/0022-3727/34/13/311

Cited by 8 publications

(10 citation statements)

References 19 publications

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“…In the plasma source, the product of the density and flow velocity is approximately constant over the source radius [22,23], and the density at the exit of the source can be estimated with In the DSMC simulation, the gas enters the simulation as an undisturbed free stream flow with the initial density set to the on-axis n(0), the initial velocity to c 0 and the initial temperature T (0) to 0.7 eV. The effective pump speeds are S1 = S2 = S3 ≈ 10.000 m 3 h −1 .…”

Section: Behavior Of the Neutral Fractionmentioning

confidence: 99%

A differentially pumped argon plasma in the linear plasma generator Magnum-PSI: gas flow and dynamics of the ionized fraction

Eck

Hansen

Kleyn

et al. 2011

Plasma Sources Sci. Technol.

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Magnum-PSI is a linear plasma generator designed to reach the plasma-surface interaction (PSI) regime of ITER and nuclear fusion reactors beyond ITER. To reach this regime, the influx of cold neutrals from the source must be significantly lower than the plasma flux reaching the target. This is achieved by a differential pumping scheme, where the vacuum vessel is divided by skimmers into separate chambers which are individually pumped. The non-magnetized expansion of 5 Pa m 3 s −1 (3 slm) argon in a low background pressure was studied in the differentially pumped vacuum vessel fitted with non-cooled flat skimmers. The behavior of the neutral component was studied with direct simulation Monte Carlo simulations and Rayleigh scattering measurements. Thomson scattering and double Langmuir probe measurements were performed on the ionized fraction. It was found that the electrons and neutral particles are not completely coupled in the shock front. The neutral fraction shows clear signs of invasion from hotter background gas, causing the average temperature and density to increase before the shock. This is also shown in the ionization ratio, which has been determined in front of and behind the first skimmer. This study helps us to understand the behavior of the gas flow in the machine and validates our modeling.

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Section: Behavior Of the Neutral Fractionmentioning

confidence: 99%

A differentially pumped argon plasma in the linear plasma generator Magnum-PSI: gas flow and dynamics of the ionized fraction

Eck

Hansen

Kleyn

et al. 2011

Plasma Sources Sci. Technol.

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“…It was assumed that the argon plasma exits the source at T e ∼ 0.7 eV 20 (nozzle radius r 0 = 4.75 mm, flow 3 slm ( = 1.35 × 10 21 s −1 ), and that the neutral density is constant over the nozzle radius. The n 0 densities at the exit n res,0 can be estimated as 23,24 n res,0 = c 0 πr…”

Section: Plasma Expansionmentioning

confidence: 99%

Advanced Thomson scattering system for high-flux linear plasma generator

Meiden¹,

Lof²,

Berg³

et al. 2012

Review of Scientific Instruments

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An advanced Thomson scattering system has been built for a linear plasma generator for plasma surface interaction studies. The Thomson scattering system is based on a Nd:YAG laser operating at the second harmonic and a detection branch featuring a high etendue (f /3) transmission grating spectrometer equipped with an intensified charged coupled device camera. The system is able to measure electron density (n e ) and temperature (T e ) profiles close to the output of the plasma source and, at a distance of 1.25 m, just in front of a target. The detection system enables to measure 50 spatial channels of about 2 mm each, along a laser chord of 95 mm. By summing a total of 30 laser pulses (0.6 J, 10 Hz), an observational error of 3% in n e and 6% in T e (at n e = 9.4 × 10 18 m −3 ) can be obtained. Single pulse Thomson scattering measurements can be performed with the same accuracy for n e > 2.8 × 10 20 m −3 . The minimum measurable density and temperature are n e < 1 × 10 17 m −3and T e < 0.07 eV, respectively. In addition, using the Rayleigh peak, superimposed on the Thomson scattered spectrum, the neutral density (n 0 ) of the plasma can be measured with an accuracy of 25% (at n 0 = 1 × 10 20 m −3 ). In this report, the performance of the Thomson scattering system will be shown along with unprecedented accurate Thomson-Rayleigh scattering measurements on a low-temperature argon plasma expansion into a low-pressure background.

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“…Completely different applications of the cascaded arc, filled with different working gases, can be found in the scientific community and in many places in industry, especially in high-speed etching and deposition processes [13]. Burm et al proposed a varying arc channel diameter to increase the ionization efficiency of a flowing cascaded arc [14][15][16] and Broks et al [17] performed a simulation with PLASIMO [18] on a specific geometry of a non-flowing cascaded arc. Surprisingly, the application as a light source is not very widespread.…”

Section: Introductionmentioning

confidence: 99%

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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Simulations of geometrically pinched argon plasmas using an extended one-dimensional model

Cited by 8 publications

References 19 publications

A differentially pumped argon plasma in the linear plasma generator Magnum-PSI: gas flow and dynamics of the ionized fraction

A differentially pumped argon plasma in the linear plasma generator Magnum-PSI: gas flow and dynamics of the ionized fraction

Advanced Thomson scattering system for high-flux linear plasma generator

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

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