Kinetic Modelling of the Plasma Recombination

Tskhakaya, D.

doi:10.1002/ctpp.201611004

Cited by 11 publications

(12 citation statements)

References 25 publications

(28 reference statements)

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“…Due to the presence of high energy non-Maxwellian tails of the electron distribution function, f e , near the target, kinetic rates of interaction between electrons and neutrals and impurities may increase by a large factor (see e.g. [10][11][12][13]). Such effects are, however, outside of the scope of the present paper, in which the emphasis is put on the ability of superthermal electrons to create substantial deviations of the electron heat conduction from predictions based on the classical Braginskii formula, and their impact on heat transmission factors γ e at the divertor target.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the strength of kinetic effects of parallel electron transport in the SOL and divertor of JET high radiative H-mode plasmas using EDGE2D-EIRENE and KIPP codes

Chankin

Corrigan

Jaervinen

et al. 2018

Plasma Phys. Control. Fusion

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KInetic code for Plasma Periphery (KIPP) was used to assess the importance of kinetic effects of parallel electron transport in the SOL and divertor of JET high radiative H-mode inter-ELM plasma conditions with the ITER-like wall and strong nitrogen (N2) injection. Plasma parameter profiles along magnetic field from one of the EDGE2D-EIRENE simulation cases were used as an input for KIPP runs. Profiles were maintained by particle and power sources. KIPP generated electron distribution functions, fe, parallel power fluxes, electron-ion thermoforces, Debye sheath potential drops and electron sheath transmission factors at divertor targets. For heat fluxes in the main SOL, KIPP results showed deviations from classical (e.g. Braginskii) fluxes by factors typically ~ 1.5, sometimes up to 2, with the flux limiting for more upstream positions and flux enhancement near entrances to the divertor. In the divertor, at the same time, for radial positions closer to the separatrix, very large heat flux enhancement factors, up to 10 or even higher, indicative of a strong non-local heat transport, were found at the outer target, with heat power flux density exhibiting bump-on-tail features at high energies. Under such extreme conditions, however, contributions of conductive power fluxes to total power fluxes were strongly reduced, with convective power fluxes becoming comparable, or sometimes exceeding, conductive power fluxes. Electron-ion thermoforce, on the other hand, which is known to be determined mostly by thermal and sub-thermal electrons, was found to be in a good agreement with Braginskii formulas, including the Zeff dependence. Overall, KIPP results indicate, at least for plasma conditions used in this modelling, a sizable, but not dominant effect of kinetics on parallel electron transport.

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Section: Introductionmentioning

confidence: 99%

Assessment of the strength of kinetic effects of parallel electron transport in the SOL and divertor of JET high radiative H-mode plasmas using EDGE2D-EIRENE and KIPP codes

Chankin

Corrigan

Jaervinen

et al. 2018

Plasma Phys. Control. Fusion

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“…The heat flux is found to be lower than the maximum free‐streaming heat flux. Future comparisons with kinetic PIC simulations should confirm or contradict results obtained with the non‐local expression.…”

Section: Discussionmentioning

confidence: 99%

Non‐local heat flux application for scrape‐off layer plasma

Bufferand

Ciraolo

Cintio

et al. 2018

Contributions to Plasma Physics

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“…The faster decay of ground state population compared with total neutral tungsten population is a result of significant population being stored in other metastable states of neutral tungsten. The electron temperature is assumed to be constant (at the bulk plasma value) in the sheath region for this model; however, Particle in Cell (PIC) simulations would suggest there is a moderate temperature change, but that is not considered here [25]. Additionally, PIC simulations would also suggest that the electron distribution is non-Maxwellian, however, temperature distributions in this work are assumed to be Maxwellian [26].…”

Section: Time Dependent Tungsten Emission and Ionization Within The S...mentioning

confidence: 99%

Time-dependent collisional radiative modeling of tungsten in the magnetic sheath for erosion diagnosis

et al. 2023

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Tungsten is the material of choice for the divertors in ITER, SPARC and future fusion reactors. Accurate diagnosis of tungsten erosion and migration is important for first wall life time, slag production and core performance. The addition of a magnetic presheath requires time-dependent collisional radiative effects to be included for accurate neutral tungsten collisional radiative modeling. Gross erosion measurements could be modified by a factor of 10 due to the inclusion of time-dependent effects for ITER relevant divertor conditions. A simple sputtering model and sheath density model are developed to investigate time-dependent collisional radiative effects. Neutral tungsten spectral lines populated from different metastable levels depend on model parameters leading to potential spectroscopic diagnostics of plasma parameters. Electron temperatures inferred from spectroscopic line ratios are in agreement with Langmuir probe measurements in the Compact Toroidal Hybrid.

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Kinetic Modelling of the Plasma Recombination

Cited by 11 publications

References 25 publications

Assessment of the strength of kinetic effects of parallel electron transport in the SOL and divertor of JET high radiative H-mode plasmas using EDGE2D-EIRENE and KIPP codes

Assessment of the strength of kinetic effects of parallel electron transport in the SOL and divertor of JET high radiative H-mode plasmas using EDGE2D-EIRENE and KIPP codes

Non‐local heat flux application for scrape‐off layer plasma

Time-dependent collisional radiative modeling of tungsten in the magnetic sheath for erosion diagnosis

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