New plasma diagnosis tables of hydrogen Stark broadening including ion dynamics

Ma, Guojun; Cardeñoso, Valentı́n

doi:10.1088/0953-4075/29/20/029

Cited by 378 publications

(328 citation statements)

References 47 publications

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“…This procedure leads to a field statistics very similar to obtained in molecular dynamics simulations with interacting particles, which is much more computationally expensive (Dufour et al 2005;Calisti et al 2011). The details of the calculation method and the reinjection technique are reported in Gigosos & Cardeñoso (1996).…”

Section: Stark-broadening Model In Computer Simulationsmentioning

confidence: 97%

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Stark broadening of lines from transition between statesn = 3 ton = 2 in neutral helium

Djurović

Savić

et al. 2014

A&A

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Context. The Stark broadening of the spectral lines of the wavelengths 501. 6, 667.8, 728.1, 388.9, 587.6, and 706.5 nm from neutral helium in plasmas are studied theoretically and experimentally. Aims. The aim of this work is to provide information about the connection between the shape and width of spectral lines and the electron density and temperature to be used as a diagnostic tool. Methods. The theoretical calculations were carried out through molecular dynamics computer simulations with noninteracting particles. The experimental measurements were done in a plasma of pure helium generated in an electromagnetically driven T-tube. The plasma diagnostics used previous results about the Stark broadening of the He I 447.1 nm and He I 492.2 nm lines and the coherence between the shape of these spectra and those obtained here. The electron temperature was obtained through a Boltzmann-plot of eight lines of Si II. Results. Several tables of width and shift are provided in a wide range of electron density and temperature. Furthermore, we supply several fitting formulas, which allow calculating the plasma electron density from the measured values of the spectral line widths. The results obtained in the laboratory and in the simulations are compared with the data from the literature.

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Section: Stark-broadening Model In Computer Simulationsmentioning

confidence: 97%

“…The physical model considered and the mathematical details of the calculation procedure can be found in Gigosos & Cardeñoso (1996), Gigosos &González (2009), andLara et al (2012). Here we give a summary of the technique and point out the particular details of this work.…”

Section: Stark-broadening Profile Calculationsmentioning

confidence: 99%

Stark broadening of lines from transition between statesn = 3 ton = 2 in neutral helium

Djurović

Savić

et al. 2014

A&A

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“…The reinjection technique guarantees that both the spatial distribution of particles and the velocities distribution are kept stationary and that no correlation effects between the exiting and the incoming particles appear. See the reference Gigosos & Cardeñoso (1996) for a detailed explanation of this method.…”

Section: Physical Model For the Plasma In The Computer Simulationmentioning

confidence: 99%

“…It is then that some theoretical treatments appeared that tried to avoid some of the simplifications that were considered, such as the consideration of quasistatic fields caused by the ions in the plasma. Several calculation methods were developed then and have proved to be very useful, such as the so-called model microfield method (MMM) (Frisch & Brissaud 1971;Seidel 1977; Article published by EDP Sciences Stehlé & Hutcheon 1994), the frequency fluctuation method (FFM) (Talin et al 1995), or the computer simulations (CS) (Stamm et al 1984;Gigosos & Cardeñoso 1987;Hegerfelt & Kesting 1988;Gigosos & Cardeñoso 1996). Then, these new treatments allowed one to face the so-called ion dynamics effects, which since the beginning were considered as the main reason for the observed discrepancies between the models established up to then and the experimental measurements (Wiese et al 1975).…”

Section: Introductionmentioning

confidence: 99%

Stark broadening tables for the helium I 447.1 line

Ma¹,

González²

2009

A&A

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Context. Stark broadening of the 447.1 line of neutral helium in a weakly coupled plasma has been studied. This spectral line has a very close forbidden component. This means it is very sensitive to the plasma electron density, which is similar to hydrogen lines, for which the Stark effect is linear. Aims. The aim of this work is to supply information to be used in the spectroscopic diagnostics of plasmas. Methods. We used computer simulations in the frame of a physical model for a plasma with weak coupling between charges. The calculation includes the so-called "ion dynamics effects" in a natural way. The electron density, the ionic and electronic temperatures, and the perturber mass were the parameters in the calculations. Results. Simulation results relate the line width, shift, shape, and especially the ratio of intensities between the allowed and forbidden components, with the plasma parameters. These results are supplied as tables of line shapes.

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“…The half-width α 1/2 has been tabulated for many hydrogen lines based on both theoretical calculations and experimental data for the temperature range 0.5-4 eV and density range 10 20-24 m −3 [19,20,22]. The half-width α 1/2 has a weak dependence on density and on temperature.…”

Section: Uncertainty In Stark Parametermentioning

confidence: 99%

Large density amplification measured on jets ejected from a magnetized plasma gun

Yun¹,

You²,

Bellan³

2007

Nucl. Fusion

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Observation of a large density amplification in the collimating plasma jet ejected from a coplanar coaxial plasma gun is reported. The jet velocity is ∼30 km s −1 and the electron density increases from ∼10 20 to 10 22-23 m −3 . In previous spheromak experiments, electron density of the order 10 19-21 m −3 had been measured in the flux conserver region, but no density measurement had been reported for the source gun region. The coplanar geometry of our electrodes permits direct observation of the entire plasma dynamics including the source region. Analysis of Stark broadened spectral lines shows that the electron density increases by a factor of 100 as the jet collimates, with a peak density of up to 10 22-23 m −3 . The observed density amplification is interpreted according to an MHD theory that explains collimation of current-carrying plasma-filled magnetic flux tubes. Issues affecting interpretation of Stark broadened line profiles and the possibility of using the high-density plasma jet for tokamak fuel injection are discussed.

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New plasma diagnosis tables of hydrogen Stark broadening including ion dynamics

Cited by 378 publications

References 47 publications

Stark broadening of lines from transition between statesn = 3 ton = 2 in neutral helium

Stark broadening of lines from transition between statesn = 3 ton = 2 in neutral helium

Stark broadening tables for the helium I 447.1 line

Large density amplification measured on jets ejected from a magnetized plasma gun

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