Helium removal from tokamaks

Reiter, D.; Kever, H.; Wolf, G.H.; Baelmans, Martine; Behrisch, R.; Schneider, R.

doi:10.1088/0741-3335/33/13/008

Cited by 99 publications

(76 citation statements)

References 28 publications

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“…The activities in 2-D modelling of the divertor plasma are widespread in the plasma physics community. A number of codes suitable for this purpose are available, including EDGE2D-Eirene (Taroni et al 1992;Simonini et al 1994), UEDGE (Rognlien et al 1992), SONIC (Shimizu et al 2009) and the SOLPS code family (Reiter et al 1991;Schneider et al 1992;Kukushkin et al 2011;Wiesen et al 2015).…”

Section: Processes Related To Plasma-materials Interactionsmentioning

confidence: 99%

Physics of ultimate detachment of a tokamak divertor plasma

Krasheninnikov¹,

2017

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The basic physics of the processes playing the most important role in divertor plasma detachment is reviewed. The models used in the two-dimensional edge plasma transport codes that are widely used to address different issues of the edge plasma physics and to simulate the experimental data, as well as the numerical schemes and convergence issues, are described. The processes leading to ultimate divertor plasma detachment, the transition to and the stability of the detached regime, as well as the impact of the magnetic configuration and divertor geometry on detachment, are considered. A consistent, integral physical picture of ultimate detachment of a tokamak divertor plasma is developed.

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Section: Processes Related To Plasma-materials Interactionsmentioning

confidence: 99%

Physics of ultimate detachment of a tokamak divertor plasma

Krasheninnikov¹,

2017

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“…The B2-Eirene code [10] is routinely applied to modelling of detachment in TCV [2]. Parallel field T e and n e profiles at various radii in the scrape-off layer (SOL) are an automatic result of any converged solution.…”

Section: Experimental Characteristics and B2-eirene Code Modellingmentioning

confidence: 99%

Predicted effects of parallel temperature gradients on the overestimation of TCV divertor target Langmuir probe Te measurements

Horáček

Pitts

Stangeby

et al. 2003

Journal of Nuclear Materials

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During high recycling conditions and divertor detachment in the TCV tokamak, divertor target Langmuir probes never measure electron temperatures much below~5 eV. Code simulations using B2-Eirene of these plasmas indicate that T e ≈ 1 eV. This inconsistency has also been seen in other tokamaks. In this paper, the influence on a theoretical Langmuir probe VI-characteristic of a strong T e gradient parallel to the magnetic field is examined by using B2-Eirene simulated T e and n e profiles and adopting a simple numerical approach to compute divertor target electron energy distribution functions. Standard fitting of these theoretically generated VI-characteristics results in a temperature very close to the predicted value at the highest densities corresponding to divertor detachment in TCV. At intermediate densities, the computed temperature at the inner target is found to be very sensitive to assumptions regarding the magnitude of the assumed electron collision mean-free-path.

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“…Presently, the favoured solutions to these problems are based on the extrapolation of the radiative divertor regimes observed in experiments, where volumetric losses reduce the power and ion¯ux to the target achieving the detached divertor regime. Two-dimensional plasma¯uid codes coupled to Monte-Carlo or diusive codes for neutral species such as B2-EIRENE [2,3], EDGE2D-NIMBUS [4,5] and UEDGE [6,7] have been developed to perform realistic calculations of the divertor and scrape-o layer (SOL) plasma parameters. These codes are routinely used to optimise the design of divertors for existing and next step devices.…”

Section: Introductionmentioning

confidence: 99%

Comparison of B2-EIRENE calculations with multi-machine experimental measurements

Loarte

Kukushkin²,

Pacher

et al. 1999

Journal of Nuclear Materials

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The B2-EIRENE code has been compared with plasma edge measurements from Alcator C-MOD, DIII-D, JET, JT-60U in L-mode and H-mode regimes. Similarities in L-mode discharges between JET and JT-60U are well reproduced by the code as well as the sudden approach to detachment seen in JT-60U when a 1% chemical sputtering yield for carbon is assumed. Comparisons between similar L-mode regimes in JET, JT-60U and Alcator C-MOD reveal the larger importance of anomalous energy convection in Alcator C-MOD with regard to larger tokamaks. H-mode discharges of DIII-D and JET can be satisfactorily modelled with similar values of the transport coecients (approximately an order magnitude smaller than in L-mode) when the power¯ow into the scrape-o layer (SOL) is dominated by the ion channel, as previous EDGE2D simulations for JET suggested. Ó

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Helium removal from tokamaks

Cited by 99 publications

References 28 publications

Physics of ultimate detachment of a tokamak divertor plasma

Physics of ultimate detachment of a tokamak divertor plasma

Predicted effects of parallel temperature gradients on the overestimation of TCV divertor target Langmuir probe Te measurements

Comparison of B2-EIRENE calculations with multi-machine experimental measurements

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