Stark broadening models for plasma diagnostics

Ma, Guojun

doi:10.1088/0022-3727/47/34/343001

Cited by 75 publications

(49 citation statements)

References 170 publications

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“…Complex structure of the carbon arc discharge for synthesis of nanotubes The Stark FWHMs were then transformed into the radial electron density profile using data of Gigosos, et.al. [41,42] as shown in Fig. 8c.…”

Section: Arc Corementioning

confidence: 78%

Complex structure of the carbon arc discharge for synthesis of nanotubes

Vekselman

Feurer

Huang

et al. 2017

Plasma Sources Sci. Technol.

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Comprehensive non-invasive spectroscopic techniques and electrical measurements of the carbon arc revealed two distinguishable plasma synthesis regions in the radial direction normal to the arc axis. These regions, which are defined as the arc core and the arc periphery, are shown to have very different compositions of carbon species with different densities and temperatures. The colder arc periphery is dominated by carbon diatomic molecules (C 2 ), which are in the minority in the composition of the hot arc core. These differences are due to a highly non-uniform distribution of the arc current, which is mainly conducted through the arc core populated with carbon atoms and ions. Therefore, the ablation of the graphite anode is governed by the arc core, while the formation of carbon molecules occurs in the colder arc periphery. This result is consistent with previous predictions that the plasma environment in the arc periphery is suitable for synthesis of carbon nanotubes.

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Section: Arc Corementioning

confidence: 78%

Complex structure of the carbon arc discharge for synthesis of nanotubes

Vekselman

Feurer

Huang

et al. 2017

Plasma Sources Sci. Technol.

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“…In the line broadening analyses, two mathematical treatments are usually adopted depending on whether the effect of the electric fields is dominated by electrons-highly mobileor ions-slower, due to the large mass [15]. In first case with very fast interactions, impact approximation is valid when the duration of effective perturbations is short compared to time scale of the atom optical emission [16].…”

Section: Theorymentioning

confidence: 99%

Electron density calculation based on Stark broadening of D Balmer line from detached plasma in EAST tungsten divertor

Ding

Chen

2018

Plasma Sci. Technol.

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Evidence and modeling of 3D divertor footprint induced by lower hybrid waves on EAST with tungsten divertor operations W. Feng, L. Wang, M. Rack et al. -A new experimental classification of divertor detachment in ASDEX Upgrade S. Potzel, M. Wischmeier, M. Bernert et al. -Inferring divertor plasma properties from hydrogen Balmer and Paschen series spectroscopy in JET-ILW B. AbstractThe electron density within the volume of the tungsten divertor of the Experimental Advanced Superconducting Tokamak (EAST) is calculated based on D ε line (396.9 nm) Stark broadening (SB) measurements. The quasistatic approximation is employed in the SB calculation of the D ε line. The influences of other broadening mechanisms on the calculation error of electron density have been evaluated. The SB method is applied to the study of spatial distribution and time evolution of the electron density in the W divertor. Two electron density bands are observed in the detached divertor plasma during an L-mode discharge sustained by low hybrid wave (LHW) heating, which could be related to the striated particle flux distribution induced by LHW. After the onset of detachment, the upper electron density band corresponding to outer strike point firstly increases then decreases, while the lower density band corresponding to striated particle flux increases continually although the electron densities from Langmuir Probes at the divertor plate keep a descending trend. This could indicate a downward movement of the radiation region that approximately moves along the magnetic field lines after the onset of detachment.

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“…This fit formula can be used for coupling parameters = ( ) 2 4 0 R 0 k B T up to 10 2 and screening parameters s up to 3. [31]. Ion dynamics should be considered, particularly in the line centre, where the life time of the excited emitter, proportional to (Δ ) −1 , is larger than the collision time.…”

Section: Ionic Microfieldmentioning

confidence: 99%

“…It is based on considering the microfield fluctuations a stochastic process without memory; for further information, see ref. [31]. It was demonstrated by Lorenzen [10] that the MMM can adequately describe the ion dynamics in this regime.…”

Section: Ionic Microfieldmentioning

confidence: 99%

Path integral approach for Stark broadening of Lyman lines in hydrogen plasma

Bedida

Difallah

Meftah

et al. 2018

Contributions to Plasma Physics

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New results for Lyman lines from hydrogen plasmas are presented using the path integral approach. The influence of plasma components (electrons and ions) on the radiator is analysed separately. The ionic contribution is treated within the path integral approach, while the electronic contribution is estimated by the standard collision operator. The Stark effect, including the ion quadrupole contribution, is considered. The time-dependent ionic microfield is treated within the path integral approximation using the model microfield method (MMM). The comparison with the quantum statistical approach is performed using a wide range of temperatures (T = 10 4 -10 7 K) and electron densities (N e = 10 23 -10 26 m −3 ). Good agreement is mainly obtained for low density and high temperature. KEYWORDSdipole autocorrelation function, path integral, quantum statistics, spectral line shape, Stark broadening 1

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Stark broadening models for plasma diagnostics

Cited by 75 publications

References 170 publications

Complex structure of the carbon arc discharge for synthesis of nanotubes

Complex structure of the carbon arc discharge for synthesis of nanotubes

Electron density calculation based on Stark broadening of D Balmer line from detached plasma in EAST tungsten divertor

Path integral approach for Stark broadening of Lyman lines in hydrogen plasma

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