Effects of varying stochastic layer on edge plasma and impurity transport in 3D EMC3-EIRENE simulations of LHD

Dai, Shuyu; Kobayashi, M.; Kawamura, G.; Shi, Quan; Feng, Y.; Wang, D.Z.

doi:10.1016/j.fusengdes.2017.04.088

Cited by 3 publications

(1 citation statement)

References 18 publications

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“…The non-axisymmetric phenomena are intrinsic in stellarators [14][15][16]. This code has been successfully applied to many fusion devices including W7-AS [12][13][14][15][16][17], LHD [18][19][20][21], DIII-D [22], ASDEX Upgrade [23,24] and EAST [25][26][27]. Recent numerical research shows that lithium emission pattern simulated by EMC3-EIRENE presents three-dimensional distribution in EAST [28][29][30], which are in good agreement with experiment results measured by the charge-coupled device (CCD) camera.…”

Section: Introductionmentioning

confidence: 57%

Modeling the toroidal asymmetry of the heat load impacted by nitrogen injection in EAST using EMC3-EIRENE

Luo

Liu

et al. 2021

Plasma Phys. Control. Fusion

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The effects of nitrogen injection on the heat load in the scape-off layer are systematically investigated in the EAST double-null divertor configuration using EMC3-EIRENE code. Nitrogen impurities injected near the separatrix line and away from the separatrix line give rise to a non-axisymmetric distribution of heat load on the target plate. With impurity injection near the separatrix line, the occurrence of the toroidal asymmetric heat load is observed only nearby the toroidal injection location, while with injection away from the separatrix line the regions of the asymmetric heat load extend and deviate from the toroidal injection position. The competition between the friction force and the ion temperature gradient force has been analyzed. It shows that when impurities are injected away from the separatrix line more impurities can be parallelly transported to a further toroidal location, which results in the extension and deviation of the non-symmetric electron temperature. When the input power is increased, the non-symmetric phenomenon of the heat load turns to be insignificant due to the reduction of the impurity density in the downstream regions, as illustrated by the field line tracing technique. Furthermore, by scanning various injection positions in the EAST tokamak, the optimum location of impurity injection has been discovered.

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