Electromagnetic stress analysis of RMP coils during VDEs of the HL-2M tokamak

Xiao, Jianzhong; Sun, Tengfei; Ren, Bo; Yang, Yong; Ji, X.Q.; Li, Xu; Liu, Yi

doi:10.1016/j.fusengdes.2020.111866

Cited by 3 publications

(1 citation statement)

References 8 publications

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“…The feature of the ELM mitigation is that the ELM frequency of bursts increases while its amplitude reduces. The RMP system is also planned to install in future tokamaks, such as ITER [13] and HL-2M [14]. Therefore, understanding the mechanism of ELM suppression and mitigation is essential to design the RMP system for future devices.…”

Section: Introductionmentioning

confidence: 99%

Penetration properties of applied resonant magnetic perturbation in HL-2A tokamak

et al. 2023

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Any arbitrary perturbation on a magnetic field separatrix can cause a structure named homoclinic tangle in tokamaks. Both an edge localized mode (ELM) and a resonant magnetic perturbation (RMP) can lead to a perturbation of the magnetic field on the separatrix. Under the appropriate circumstances, RMP could alleviate or even completely suppress a rapid collapse process of an ELM. The simulation results using the CLTx code, the extended version of the three-dimensional toroidal magnetohydrodynamic (MHD) code (CLT) with a scrape-off layer, show the structure of the homoclinic tangle with a borderline stochastic region resulting from RMP in HL-2A tokamak. Strongly distorted magnetic field lines with the homoclinic tangle could connect to the tokamak divertors. The footprints of these magnetic field lines on the divertors are consistent with the energy deposit spots in the experiment. From Poincaré plots of escaped magnetic field lines, it is found that the depth of the plasma edge region penetrated by these field lines depends on the RMP coil current, the rotation frequency of the RMP field, and the plasma resistivity.

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Section: Introductionmentioning

confidence: 99%

Penetration properties of applied resonant magnetic perturbation in HL-2A tokamak

et al. 2023

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Structural optimization design and numerical analysis of in-vessel magnetic compression coils

Zhang

Ren

Yang

et al. 2023

Fusion Engineering and Design

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Influence of toroidal rotation on plasma response to external RMP fields in tokamak

Li¹,

Hao²,

Liu³

et al. 2022

Acta Phys. Sin.

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The edge localized mode (ELM) is an essential magneto-hydrodynamic(MHD) instability in tokamak high-confinement (H-mode) discharges, that leads to the huge heat loads on the plasma-facing components (PFCs) and may result in the damage to thePFCs. It is important to effectively control the large ELMs, in order to ensure the safe operation of the reactor-level devices (e.g. ITER, DEMO), and to improve plasma performance in the present machines (e.g. HL-2A/2M and EAST in China). Resonant magnetic perturbation (RMP) is experimentally demonstrated to be an effective and robust method of controlling the ELM. Several key parameters (such as the edge safety factor, the plasma flow, the RMP coil geometry and its current toroidal phasing) play an important role in controlling the ELM by the RMP. In addition, the plasma pressure also affects the plasma response to the applied external RMP, in particular near the no-wall beta limit. For example, the plasma has an amplification effect on the RMP when the plasma pressure is too high. However, in the high-pressure tokamak plasma, the influence of toroidal rotation on RMP spectrum needs further investigating, in order to give the supports in physics for the future devices (e.g. ITER). In the 10 MA scenario of ITER, the device will operate in a pressure regime near to the no-wall beta limit. In addition, the new tokamak device HL-2M will operate in the relatively high-beta regime and provide an experimental platform for studying the RMP physics and the related ELM control by RMP in high-performance plasma. It is valuable to carry out the related numerical computation for guiding the future HL-2M experiment with ELM controlled by the RMP. In this work, the single fluid model is employed, including the two main physical quantities related to RMP physics: plasma resistivity and toroidal rotation. The former allows the penetrating of external RMP field inside the plasma, while the latter mainly gives rise to the screening effect on the applied RMP field. In the present work, numerical investigations are performed by utilizing the MARS-F code (linearized single fluid resistive MHD code in full toroidal geometry), to understand the plasma response to the externally applied <i>n</i>=1 (<i>n</i> is the toroidal mode number) RMP in high-pressure plasma on HL-2M, while varying the plasma toroidal rotation profile. The plasma response is found to (i) substantially modify the poloidal spectrum of the applied vacuum RMP field, (ii) change the amplitude of the resonant radial field amplitude near the plasma edge, and (iii) affect optimal current phasing between the two rows of RMP coils on HL-2M. A sufficiently slow toroidal flow near the plasma edge amplifies the radial field at rational surfaces associated with the perturbation. Since the latter serves as a reliable indicator for controlling the type-I edge localized mode (ELM) by the RMP, varying rotation profile near the plasma edge offers a promising approach to optimizing the ELM control.

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Electromagnetic stress analysis of RMP coils during VDEs of the HL-2M tokamak

Cited by 3 publications

References 8 publications

Penetration properties of applied resonant magnetic perturbation in HL-2A tokamak

Penetration properties of applied resonant magnetic perturbation in HL-2A tokamak

Structural optimization design and numerical analysis of in-vessel magnetic compression coils

Influence of toroidal rotation on plasma response to external RMP fields in tokamak

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