Impacts of resonant magnetic perturbations on edge carbon transport and emission on EAST with EMC3-EIRENE modelling

Dai, Shuyu; Zhang, H. M.; Lyu, Bo; Wang, L.; Feng, Y.; Wang, Z. X.; Wang, D. Z.

doi:10.1017/s0022377820000422

Cited by 10 publications

(19 citation statements)

References 68 publications

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“…The present results should be taken with a caveat: edge impurity transport and emissions could be modified from changes in the edge magnetic configuration resulting from the effects of the plasma response to the application of RMPs. Work is currently underway to include the effects of the plasma response and to validate the coefficients of impurity sputtering in the no-RMP and with-RMP cases (Dai et al 2020).…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

“…While the impurity distributions present slight variations at different ϕ locations, the features described are the same in all of them. A detailed analysis on the impact of RMP on transport of carbon at the edge for the same discharge can be seen in Dai et al (2020).…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

“…Work is currently underway to include the effects of the plasma response and to validate the coefficients of impurity sputtering in the no-RMP and with-RMP cases (Dai et al. 2020).

Figure 6.Non-symmetric toroidal phase distribution of ( a ) and ( b ) concentrations in the SOL and outer core region, in response to RMP geometry.…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

“…While the impurity distributions present slight variations at different locations, the features described are the same in all of them. A detailed analysis on the impact of RMP on transport of carbon at the edge for the same discharge can be seen in Dai et al (2020).

Figure 8.( a ) Exhaust of from core to SOL and ( b ) overall decrease of concentration and formation of filament structures at SOL, when RMPs are injected .…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

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Experimental and simulation study of impurity transport response to RMPs in RF-heated H-mode plasmas at EAST

et al. 2021

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Spatial profiles of impurity emission measurements in the extreme ultraviolet (EUV) spectroscopic range in radiofrequency (RF)-heated discharges are combined with one-dimensional and three-dimensional transport simulations to study the effects of resonant magnetic perturbations (RMPs) on core impurity accumulation at EAST. The amount of impurity line emission mitigation by RMPs appears to be correlated with the ion Z for lithium, carbon, iron and tungsten monitored, i.e. stronger suppression of accumulation for heavier ions. The targeted effect on the most detrimental high-Z impurities suggests a possible advantage using RMPs for impurity control. Profiles of transport coefficients are calculated with the STRAHL one-dimensional impurity transport code, keeping $\nu /D$ fixed and using the measured spatial profiles of $\textrm{F}{\textrm{e}^{20 + }}$ , $\textrm{F}{\textrm{e}^{21 + }}$ and $\textrm{F}{\textrm{e}^{22 + }}$ to disentangle the transport coefficients. The iron diffusion coefficient ${D_{\textrm{Fe}}}$ increases from $1.0- 2.0\;{\textrm{m}^2}\;{\textrm{s}^{ - 1}}$ to $1.5- 3.0\;{\textrm{m}^2}\;{\textrm{s}^{ - 1}}$ from the core region to the edge region $(\rho \gt 0.5)$ after the onset of RMPs. Meanwhile, an inward pinch of iron convective velocity ${\nu _{\textrm{Fe}}}$ decreases in magnitude in the inner core region and increases significantly in the outer confined region, simultaneously contributing to preserving centrally peaked $\textrm{Fe}$ profiles and exhausting the impurities. The ${D_{\textrm{Fe}}}$ and ${\nu _{\textrm{Fe}}}$ variations lead to reduced impurity contents in the plasma. The three-dimensional edge impurity transport code EMC3-EIRENE was also applied for a case of RMP-mitigated high-Z accumulation at EAST and compared to that of low-Z carbon. The exhaust of ${\textrm{C}^{6 + }}$ toward the scrape-off layer accompanying an overall suppression of heavier ${\textrm{W}^{30 + }}$ is observed when using RMPs.

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Section: Simulation Results and Discussionmentioning

confidence: 99%

Section: Simulation Results and Discussionmentioning

confidence: 99%

“…Work is currently underway to include the effects of the plasma response and to validate the coefficients of impurity sputtering in the no-RMP and with-RMP cases (Dai et al. 2020).

Figure 6.Non-symmetric toroidal phase distribution of ( a ) and ( b ) concentrations in the SOL and outer core region, in response to RMP geometry.…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

Figure 8.( a ) Exhaust of from core to SOL and ( b ) overall decrease of concentration and formation of filament structures at SOL, when RMPs are injected .…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

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Experimental and simulation study of impurity transport response to RMPs in RF-heated H-mode plasmas at EAST

et al. 2021

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“…The EMC3 code applies an advanced Monte Carlo algorithm to solve the fluid equations. The code has been widely used in multiple devices, including stellarators and tokamaks such as W7-X [27], LHD [28][29][30][31][32], TEXTOR-DED [33], DIII-D [34], ASDEX-U [35], JET [36], TCV [37] and EAST [38][39][40][41][42][43][44]. In this work, the grid generator of EMC3-EIRENE is adapted to the J-TEXT axisymmetric HFS divertor configurations.…”

Section: Simulation Procedures and Resultsmentioning

confidence: 99%

Influence of the X-point location on edge plasma transport in the J-TEXT tokamak with a high-field-side single-null divertor

Wang¹,

Liang²,

Xu³

et al. 2021

Plasma Sci. Technol.

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High-density experiments in the high-field-side mid-plane single-null divertor configuration have been performed for the first time on J-TEXT. The experiments show an increase in the highest central channel line-averaged density from 2.73 × 10 19 m − 3 to 6.49 × 10 19 m − 3 , while the X-point moves away from the target by increasing the divertor coil current. The corresponding Greenwald fraction rises from 0.50 to 0.79. For the impurity transport, the density normalized radiation intensity (absolute extreme ultraviolet and soft x-ray) of the central channel density decreased significantly (>50%) with an increase in the plasma density. To better understand the underlying physics mechanisms, the 3D edge Monte Carlo code coupled with EIRENE (EMC3- EIRENE) has been implemented for the first time on J-TEXT. The simulation results show good agreement with the experimental findings. As the X-point moves away from the target, the divertor power decay length drops and the scrape-off layer impurity screening effect is enhanced.

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3D Modelling of the Lithium Injection Experiment in H-Mode Plasma of EAST

et al. 2020

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Impacts of resonant magnetic perturbations on edge carbon transport and emission on EAST with EMC3-EIRENE modelling

Cited by 10 publications

References 68 publications

Experimental and simulation study of impurity transport response to RMPs in RF-heated H-mode plasmas at EAST

Experimental and simulation study of impurity transport response to RMPs in RF-heated H-mode plasmas at EAST

Influence of the X-point location on edge plasma transport in the J-TEXT tokamak with a high-field-side single-null divertor

3D Modelling of the Lithium Injection Experiment in H-Mode Plasma of EAST

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