Integrated ELM and divertor power flux control using RMPs with low input torque in EAST in support of the ITER research plan

Jia, M.; Loarte, A.; Sun, Yuan; Ma, Qun; Wu, Xiaqing; Xie, Ping; Gu, Shuai; Hou, Jilei; He, Kang; Li, Guoqiang; Li, Kedong; Li, Yingying; Liang, Yun-Feng; Paz-Soldan, C.; Shi, Tonghui; Shen, Biao; Wan, Baonian; Wang, Liang; Wang, Yumin; Xu, Jichan; Xu, Shuai; Yang, Zhendong; Zang, Qing; Zhang, Bin; Zhang, Jie; Zhang, Ling; Zuo, Guizhong

doi:10.1088/1741-4326/ac21f9

Cited by 21 publications

(20 citation statements)

References 48 publications

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“…In principle, therefore, our two-fluid CUTIE model predicts both the transition, the near-complete mitigation of the type-I ELMs and the existence of a ‘point/discrete spectrum (coherent modes)’ after transitions, which may manifest as observable oscillations near

0.9

, near the plasma edge. These findings bear a close qualitative resemblance to recent experimental observations [ 21 ] and may have important implications for RMP suppression of ELMs on ITER [ 27 ]. We next turn to the question of how the transitions in the turbulence (both waveform amplitudes and spectral characteristics) affect the global properties such as ‘Density pump out’ and

) post-transition.…”

Section: Results Of Simulationssupporting

confidence: 86%

Bifurcation behaviour of resonant magnetic perturbation control of edge localized modes in tokamaks: nonlinear simulation results

Thyagaraja

Sen

Chandra

2023

Phil. Trans. R. Soc. A.

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In this article, some novel results of two fluid nonlinear simulations on the control of edge localized modes (ELMs) in tokamaks by resonant magnetic perturbations (RMPs) are presented. Many experiments around the world have demonstrated that RMPs are effective in possibly mitigating or even completely suppressing strong (type I) ELMs that would seriously degrade confinement and could cause other heat-flux problems in both present (e.g. JET) and planned future tokamaks (ITER). Our simulations demonstrate that non-axisymmetric RMPs with toroidal mode numbers n = 2 , 3 , 4 and suitable field-strengths (kAturns) at the plasma wall imply significant bifurcations in their ability to mitigate or even suppress type-I ELMs, qualitatively similar to RMP effects on ELMs reported in experiments. This article is part of a discussion meeting issue ‘H-mode transition and pedestal studies in fusion plasmas’.

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0.9

) post-transition.…”

Section: Results Of Simulationssupporting

confidence: 86%

Bifurcation behaviour of resonant magnetic perturbation control of edge localized modes in tokamaks: nonlinear simulation results

Thyagaraja

Sen

Chandra

2023

Phil. Trans. R. Soc. A.

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“…While maintaining the desired ELM phase, the control of steady-state divertor heat loads by divertor detachment is simultaneously required in high-performance future tokamaks, including ITER. To achieve this operational regime, experimental and theoretical studies on the compatibility of RMPinduced ELM control with detachment have been conducted [16,17]. Also, impurity-seeded detachment, as well as ELM suppression, was experimentally achieved [18].…”

Section: Introductionmentioning

confidence: 99%

Argon–seeded detachment during ELM control by RMPs in KSTAR

et al. 2023

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In this study, we demonstrate argon-seeded discharges that exhibited a detached divertor during the full suppression and mitigation of edge localized modes (ELMs) by an ITER-like, three-row resonant magnetic perturbation (RMP) configuration in KSTAR. During the ELM suppression phase, the peak heat flux on the divertor target was successfully reduced from 1.6 MW/m2 to 0.5 MW/m2 via argon seeding. Further, the ion saturation current densities corresponding to the particle fluxes on both targets were reduced by more than 50%. During the RMP grassy-ELM regime, a further reduction to 0.1 MW/m2 in the divertor heat load was successfully achieved. A highly localized radiation zone near the x-point was also observed during divertor detachment. The calculated degree of detachment (DoD) based on the two-point model increased to levels of approximately 3 and 2.3 for the outer target and inner target cases, respectively. These results provide valuable information regarding the effect of mid-Z impurities on RMP-detachment-compatible discharges.

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“…At these levels, MHD currents in the plasma may be strong enough to modify the vacuum magnetic field, thus resulting in the magnetic topology changes [8][9][10][11][12]. Previous studies have also showed that the divertor plasma operation is highly dependent on the magnetic topology [13][14][15][16][17][18][19][20][21][22][23][24]. Therefore, the study on edge plasma transport with finite beta effects is an essential topic for high-performance plasmas in future W7-X experiments.…”

Section: Introductionmentioning

confidence: 99%

Modeling of plasma beta effects on the island divertor transport in the standard configuration of W7-X

Liang

Knieps

et al. 2023

Nucl. Fusion

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The influence of plasma beta effects on the edge plasma transport in the Wendelstein 7-X standard configuration is studied systematically by using EMC3-EIRENE combined with a 3D equilibrium code named HINT. The magnetic topology changes induced by plasma beta effects are significantly reflected in plasma transport behaviors and heat flux patterns on divertor targets. After validating the modeling strategy by comparisons with experimental data, the extended simulations for high performance plasmas show that the threshold separatrix density for accessing the power detachment is reduced in higher beta plasmas. Compared with the vacuum field case, the impurity radiation distributions with finite beta effects are modified in the magnetic island region. The divertor heat flux is distributed more evenly along the toroidal direction on the strike line at the vertical target. The strike line on the horizontal target moves towards the pumping gap with an increase in the plasma beta. In addition, the different pressure profiles with the same central beta also result in a modified heat flux pattern on the divertor targets.

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Integrated ELM and divertor power flux control using RMPs with low input torque in EAST in support of the ITER research plan

Abstract: suppression in ITER high Q DT scenarios since they provide optimum integration features regarding energy and particle confinement, pellet fuelling, radiative divertor operation while eliminating ELM transient power loads and being compatible with low torque input.

Cited by 21 publications

References 48 publications

Bifurcation behaviour of resonant magnetic perturbation control of edge localized modes in tokamaks: nonlinear simulation results

Bifurcation behaviour of resonant magnetic perturbation control of edge localized modes in tokamaks: nonlinear simulation results

Argon–seeded detachment during ELM control by RMPs in KSTAR

Modeling of plasma beta effects on the island divertor transport in the standard configuration of W7-X

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