Modelling of tungsten re-deposition coefficient

Self Cite

“…double Maxwell-averaged V 1 V 2 σ T BR (E 1 , E 2 , n) obtained from Eqs. (11,12,13), showing good agreement with the existing data from [20]. In Fig.…”

Section: Radiative Recombinationsupporting

confidence: 84%

Section: Implementation Of Recombination Processesmentioning

confidence: 99%

Section: Pic Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Kinetic Modelling of the Plasma Recombination

Tskhakaya

2016

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“…If ionisation takes place mainly within the sheath, the amount of ERO-PIC simulated prompt deposition of tungsten for the cases studied so far is similar to values estimated in [17] by means of an analytic fit formula which has been deduced for the condition when ionisation takes place inside the sheath. In the future more studies will be done with ERO-PIC in comparison with results from [17] and also recent work published in [18] carried out by Monte-Carlo simulations. Moreover, plasma conditions during ELMs, where in contrast to steady state conditions significant tungsten sputtering can occur within the divertor of ITER, will be analysed.…”

Section: Conclusion and Summarysupporting

confidence: 75%

Modelling of Impurity Transport and Plasma–Wall Interaction in Fusion Devices with the ERO Code: Basics of the Code and Examples of Application

Kirschner

Tskhakaya

Kawamura

et al. 2016

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The 3D ERO code, which simulates plasma-wall interaction and impurity transport in magnetically confined fusion-relevant devices is described. As application, prompt deposition of eroded tungsten has been simulated at surfaces with shallow magnetic field of 3 T. Dedicated PIC simulations have been performed to calculate the characteristics of the sheath in front of plasma-exposed surfaces to use as input for these ERO simulations. Prompt deposition of tungsten reaches 100% at the highest electron temperature and density. In comparison to more simplified assumptions for the sheath the amount of prompt deposition is in general smaller if the PICcalculated sheath is used. Due to friction with the background plasma the impact energy of deposited tungsten can be significantly larger than the energy gained in the sheath potential.

Simulations of Tungsten Re‐deposition Using a Particle‐In‐Cell Code with Non‐uniform Super Particle Sizes

Ibano

Togo

Lang

et al. 2016

Tungsten (W), a promising candidate as divertor plasma facing material in magnetic fusion devices, is anticipated to promptly redeposit when sputtered or evaporated from surface due to its small ionization energy and long gyro radius. Using an artificial factor for the reaction cross sections, effects of ionization lengths to the re-deposition rate was studied by a newly developed particle-in-cell code. Treating numbers of particles in a super particle, electric charge, and mass as particle variables in the code, a special scheme for ionization and recombination was developed and used for the calculation. Simulations on W test particles with imaginary properties (neglecting the electric force) revealed the effects of ejection angles. Simulations with secondary electrons from surface showed that the sheath potential is weakened and the re-deposition rate becomes small. It was found that the multi-ionization as well as the ionization mean-free-path influences the re-deposition rate in both simulations.