Investigations of the origins of deposited carbon species in gaps between divertor tiles using a kinetic code system

Dai, Shuyu; Sang, Chaofeng; Liu, Shengguang; Sun, Jizhong; Wang, Dezhen

doi:10.1016/j.fusengdes.2012.02.028

Cited by 3 publications

(2 citation statements)

References 34 publications

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“…In this work the particle-in-cell Monte Carlo collision (PIC-MCC) code SDPIC [28][29][30] coupled with the Monte Carlo (MC) code ITCD [31,32] is employed to investigate the material erosion and impurity transport on the divertor plate during type-I ELMs on EAST. The characteristics of the SOL and divertor plasma during ELMs are studied with the SDPIC code, which can well describe the behaviour of kinetic factors such as incident energy and angle and heat flux during transients.…”

Section: Introductionmentioning

confidence: 99%

Kinetic modelling of material erosion and impurity transport in edge localized modes in EAST

et al. 2015

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The kinetic modelling of material erosion and impurity transport on divertor plates in edge localized modes (ELMs) in tokamaks has been performed using the SDPIC and ITCD codes. The kinetic information on impinging particles and background plasma such as incident angle and energy, electric potential and field during ELMs can be well treated by the SDPIC code; this is generally difficult to obtain in experiments and fluid simulations due to diagnostic and technical limitations. The heat flux modelled with the SDPIC code can well reproduce the experimental result in EAST. The major power delivered by ions results in a strong increase of the erosion rate for both carbon and tungsten substrates during ELMs. The variation of the incident angle of impinging particles can be interpreted by the change of the potential drop induced by fast electrons during ELMs. The time difference in the peak values of erosion rate between the carbon and tungsten substrates is determined by the particle flux and sputtering yield. The heat loads for present ELMs in EAST cannot cause the ablation and melting of surface material. The eroded tungsten species show different transport properties from the eroded carbon species due to the small mean free path of W atoms and consequent prompt redeposition. A W self-sputtering avalanche is not observed during ELMs, ascribed to the small kinetic energy carried by the redeposited W species.

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Section: Introductionmentioning

confidence: 99%

Kinetic modelling of material erosion and impurity transport in edge localized modes in EAST

et al. 2015

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“…[16]- [18], and the code has been successfully used to study hydrocarbons deposited inside the gaps. [19] During the simulation, the trajectories of charged particles are tracked by solution of Newton's equations of motion, where the electric field is obtained by solving Poisson's equation. The electric potential, plasma density distribution, particle and energy fluxes to the wall, which are the basic information for studying plasma material interactions, could be obtained.…”

Section: Simulation Modelsmentioning

confidence: 99%