EAST equilibrium current profile reconstruction using polarimeter-interferometer internal measurement constraints

Qian, J.; Lao, L. L.; Liu, H.Q.; Ding, W. X.; Zeng, Long; Luo, Z.P.; Ren, Q.; Huang, Yao; Huang, Juan; Brower, D. L.; Hanada, K.; Chen, D.L.; Sun, Yuan; Shen, Biao; Gong, Xianzu; Xiao, Bingjia; Wan, B. N.

doi:10.1088/1741-4326/aa4e58

Cited by 67 publications

(62 citation statements)

References 20 publications

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“…A very low loop voltage of ~0.005V was obtained. No sawteeth was observed in the whole discharge which is consistent with the minimum q in the q profile (qmin>1.0), where the q profile using external magnetic measurements and POINT constraints [2]. Transport analysis shows that the bootstrap current fraction fbs is ~45%.…”

Section: Extension Of Steady-state Operational Regime With Dominant Rsupporting

confidence: 75%

Recent advances in EAST physics experiments in support of steady-state operation for ITER and CFETR

et al. 2019

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The recent EAST experimental progress since the last IAEA FEC in 2016 is presented. First demonstration of >100 seconds time scale long-pulse steady-state scenario with a good plasma performance (H98(y2) ~ 1.1) and a good control of impurity and heat exhaust with the tungsten divertor has been successfully achieved on EAST using the pure RF power heating and current drive. The extended operation regimes have been obtained (βP~2.5 & βN~1.9 of using RF&NB and βP~1.9 & βN~1.5). High bootstrap current fraction up to 47% was achieved with q95~6.0-7.0. The interaction effect between the ECH and two LHW systems has been investigated for enhanced current drive and improved confinement quality. ELM suppression using the n= 2 RMPs has been achieved at q95 (≈ 3.2-3.7) with standard type-I ELMy H-mode operational window in EAST. Reduction of the peak heat flux on the divertor was demonstrated using the active radiation feedback control. An increase in the total heating power and improvement of the plasma confinement are expected using a 0-D model prediction for higher bootstrap fraction. Towards long pulse, high bootstrap current fraction operation, a new lower ITER-like tungsten divertor with active watercooling will be installed, together with further increase and improvement of heating and current drive capability.

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Section: Extension Of Steady-state Operational Regime With Dominant Rsupporting

confidence: 75%

Recent advances in EAST physics experiments in support of steady-state operation for ITER and CFETR

et al. 2019

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“…On EAST, increasing the e results in the requirement of more external CD to compensate the reduced LHCD efficiency. The q profile was found to be weak shearred with the q min >1.5 infered from the EFIT code constrained by POINT data [8]. The internal inductance, li slightly decreased from 0.95 to 0.8 during NBI H-mode phase.…”

Section: Exploration Of Steady-state Plasma Operation With Iter-like mentioning

confidence: 70%

“…The injected power were ~2.6MW LHW, ~1MW ICRF and 0.5MW ECRH. The Hmode pulse length is longer than 15 times the current relaxation time [8] ( R~0 .4s), with loop voltage maintained at -10 mV. From the Faraday rotation measurement shown in Fig.…”

Section: Scenario Development With Sole Rf Heatingmentioning

confidence: 99%

Overview of EAST experiments on the development of high-performance steady-state scenario

et al. 2017

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The EAST research program aims to demonstrate steady-state long-pulse advanced high-performance H-mode operations with ITER-like poloidal configuration and RF-dominated heating schemes. Since last IAEA FEC, EAST has been upgraded with all ITER-relevant auxiliary heating and current drive systems, enabling the investigation of plasma profile control by coupling/integration of various combinations. By means of the 4.6 GHz and 2.45 GHz LHCD systems, H-mode can be obtained and maintained at relatively high density, even up to n e ~ 4.5 × 10 19 m-3 , where a current drive effect is still observed. Significant progress has been achieved on EAST, including: i). Demonstration of a steady-state scenario (fully non-inductive with V loop ~ 0.0V at high β P ~ 1.8 and high performance (H 98,y2 > 1.0) in upper single-null (ε ~ 1.6) configuration with the tungsten divertor; ii) Discovery of a stationary ELM-stable H-mode regime with 4.6 GHz LHCD; iii) achievement of ELM suppression in slowly-rotating H-mode plasma with the application of n = 1 and 2 RMPs.

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“…2013; Qian et al. 2017) show that the fishbone instability is located inside the q = 1 surface, corresponding to ρ ~ 0.15 ( ρ is the square root of the normalized toroidal flux), as shown in figure 3( c ). Also, with the increase of injected NBI power, the total plasma pressure increases, as shown in figure 3( a ), but no clear change of the safety factor profiles in the core plasmas is observed and the magnetic shear is close to zero in the core region, as presented in figure 3( c , d ).…”

Section: Dependence Of Fishbone Cycle Frequency On Plasma Parametersmentioning

confidence: 93%

Dependence of fishbone cycle on energetic particle intensity in EAST low-magnetic-shear plasmas

et al. 2020

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The dependence of fishbone cycle on energetic particle intensity has been investigated in EAST low-magnetic-shear plasmas. It is observed that the fishbone mode growth rate, saturation amplitude as well as fishbone cycle frequency clearly increase with increasing neutral beam injection (NBI) power. Moreover, enhanced electron density and temperature perturbations as well as energetic particle loss were observed with greater injected NBI power. Simulation results using M3D-K code show that as the NBI power increases, the resonant frequency and the energy of the resonant particles become higher, and the saturation amplitude of the mode also changes, due to the non-perturbative energetic particle contribution. The relationship between the calculated energetic particle pressure ratio and fishbone cycle frequency is obtained as ${f_{\textrm{FC}}} = 2.2{(1000{\beta _{\textrm{ep,calc}}} - 0.1)^{5.9 \pm 0.5}}$ . Results consistent with the experimental observations have been achieved based on a predator–prey model.

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EAST equilibrium current profile reconstruction using polarimeter-interferometer internal measurement constraints

Cited by 67 publications

References 20 publications

Recent advances in EAST physics experiments in support of steady-state operation for ITER and CFETR

Recent advances in EAST physics experiments in support of steady-state operation for ITER and CFETR

Overview of EAST experiments on the development of high-performance steady-state scenario

Dependence of fishbone cycle on energetic particle intensity in EAST low-magnetic-shear plasmas

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