Recent results of fusion triple product on EAST tokamak

Gao, Xiang; Zhang, Tao; Wu, Muquan

doi:10.1088/2058-6272/ac1165

Cited by 11 publications

(10 citation statements)

References 32 publications

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“…Note that the ECE power displayed here is only used to analyze the relative change of T e rather than the absolute value of T e , as explained in previous work [34]. As shown in figure 3 of Gao et al [35], with auxiliary lower-hybrid wave (LHW) and neutral-beam injection (NBI) heating, it was specified that strong and broad ITBs were formed in n e , T e and T i profiles at t = 3.59 s. Then, the ITB was fully developed up to t = 3.75 s, located near ρ = 0.25-0.5. Notably, after the ITB was fully developed, this typical discharge #56933 achieved the largest value of the triple product n i0 T i0 τ E ∼ 1.0 × 10 19 m −3 keV s for EAST so far.…”

Section: Experimental Observation and Simulation Setupmentioning

confidence: 99%

Multiple interactions between fishbone instabilities and internal transport barriers in EAST plasmas

Wang

et al. 2022

Nucl. Fusion

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The fishbone instabilities and internal transport barriers (ITBs) are frequently and sequentially observed in tokamak plasmas. Recently, the relationship between fishbone and ITB was numerically studied mainly on the basis of experimental results (Z. X. Liu et al., 2020 Nucl. Fusion 60 122001). It was identified that a radial electric field can be generated by fishbone itself, which may act as a trigger of ITB formation. To gain a deeper understanding of this subject, in this work, we further demonstrate the multiple interactions between fishbone instability and ITB in Experimental Advanced Superconducting Tokamak (EAST) experiment (discharge #56933) using hybrid kinetic-MHD code M3D-K. In the multiple-n simulations, it is found that the zonal electric field can be induced in the nonlinear stage of fishbone, leading to a relatively large E×B zonal flow that is sufficient to suppress the dominant microinstability before ITB formation, which should account for the trigger of ITB. After the ITB is triggered, the equilibrium pressure gradient increases and the fast ions from the neutral beam injection accumulate in ITB region. Then, the linear simulations are performed to analyze the effect of ITB formation on fishbone instability. It is shown that due to the change of the pressure gradient during ITB expansion, the change of bootstrap current density profile modifies the q profile, and then stabilizes the fishbone mode. Additionally, the accumulation of the fast ions leads to a broadening of fast ion distribution around the ITB region, which also has a stabilizing effect on the fishbone mode.

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Section: Experimental Observation and Simulation Setupmentioning

confidence: 99%

Multiple interactions between fishbone instabilities and internal transport barriers in EAST plasmas

Wang

et al. 2022

Nucl. Fusion

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“…Here we very briefly review some of these results. Perhaps first and foremost, the best triple product up to now is 10 19 [14], at least a factor of 150 less than what JT-60U achieved 20 years ago, and about a factor of 30-50 less than what TPX hoped to achieve. Their result is comparable to results from Alcator A, PDX, and D-3 forty years ago.…”

Section: Optimistic Assumptions On Current Drivementioning

confidence: 88%

“…Their result is comparable to results from Alcator A, PDX, and D-3 forty years ago. In fact, the stored plasma energy in both EAST and KSTAR varies from about 100 to 400 kJ [12][13][14]. This is considerably less than the nearly 10 MJ stored in JT-60, and they also achieved lower density.…”

Section: Optimistic Assumptions On Current Drivementioning

confidence: 96%

“…However other laboratories have built superconducting tokamaks in the interim, Tore Supra in France [11], KSTAR (Korea superconducting tokamak advanced reactor) in Korea [12], and EAST (experimental advanced superconducting tokamak) in China [13,14]. These have been up and running for quite a while, a decade or more, and have been powered by ∼5-10 MW of microwaves and beams, not much less than that powering JET and JT-60 as figure 3 shows.…”

Section: Optimistic Assumptions On Current Drivementioning

confidence: 99%

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Comment on ‘The advanced tokamak path to a compact net electric fusion pilot plant’

Manheimer¹

2022

Nucl. Fusion

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This comment (letter) examines a recent GA concept which they hope will lead to a tokamak fusion pilot plant. As tokamaks are now the closest configuration to practical magnetic fusion, if they cannot do a pilot plant, almost certainly no other device can either. The conclusion is that constructing a tokamak fusion pilot plant at this time is enormously risky, and is almost certainly tremendous waste of scarce fusion resources, which could be better used on other efforts in the fusion effort.

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“…The magnetic field generated on the load side achieves balanced control of the vertical displacement of the plasma. 1 The superconducting load coil is affected by plasma motion and the surrounding magnetic field environment; thus, the inductance on the load side will fluctuate within a certain range. At the same time, the coupling disturbance electromotive force will be generated on load side coil because of complex external disturbance.…”

Section: Introductionmentioning

confidence: 99%

Disturbance supression improved discrete sliding mode fast current tracking control of experimental advanced superconducting tokamak fast control power supply

Chen,

Huang,

Wang

2023

Circuit Theory & Apps

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SummaryThe output current of the fast control power supply for the Experimental Advanced Superconducting Tokamak (EAST) excites the load coil. Magnetic field can be quickly generated by the fast output current to control the balance of plasma vertical displacement. In order to improve the output current speed of EAST fast control power supply and its ability to resist external disturbance, an improved discrete integral sliding mode control method combining gray prediction and variable gain sliding mode observer is proposed. A sliding mode disturbance observer is used to observe the total disturbance on the load side, and feedforward compensation control is performed on the total disturbance. To further suppress chattering and accelerate convergence speed, a high‐order term is added to the traditional discrete exponential reach law, and a gain adaptive observer is designed to adaptively adjust the observer gain based on the observed current error and the tracking current error. In the current sampling process, an improved gray prediction structure is added, and the original current sequence of gray prediction is improved based on the principle of new information priority, improving the accuracy of predicted current, compensating for the inherent delay in digital control, and further improving the output current response speed. Simulation and experimental verification show that the proposed disturbance suppression improved discrete integral sliding mode fast current tracking control strategy has faster output current response speed and strong antidisturbance performance.

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Recent results of fusion triple product on EAST tokamak

Cited by 11 publications

References 32 publications

Multiple interactions between fishbone instabilities and internal transport barriers in EAST plasmas

Multiple interactions between fishbone instabilities and internal transport barriers in EAST plasmas

Comment on ‘The advanced tokamak path to a compact net electric fusion pilot plant’

Disturbance supression improved discrete sliding mode fast current tracking control of experimental advanced superconducting tokamak fast control power supply

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