Edge Localized Mode (ELM)

Liang, Yun-Feng

doi:10.1007/978-3-662-44222-7_5

Cited by 5 publications

(6 citation statements)

References 160 publications

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“…At the plasma edge where rational surfaces are close to each other, consecutive island chains are likely to overlap and induce an ergodic layer [1]. The radial particle and heat transport being enhanced in the ergodic zone, RMPs should be able to slightly deconfine the plasma edge and reduce the pedestal pressure gradient under the ELM-triggering threshold (so far understood in the framework of the Peeling-Ballooning or P-B theory) [2,3]. In addition, RMPs are also believed to lower the P-B stability boundary limit, resulting in more frequent, smaller ELMs [4,5].…”

Section: Introductionmentioning

confidence: 99%

Non-linear modeling of the plasma response to RMPs in ASDEX Upgrade

et al. 2016

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The plasma response to Resonant Magnetic Perturbations (RMPs) in ASDEX Upgrade is modeled with the non-linear resistive MHD code JOREK, using input profiles that match those of the experiments as closely as possible. The RMP configuration for which Edge Localized Modes are best mitigated in experiments is related to the largest edge kink response observed near the X-point in modeling. On the edge resonant surfaces q = m/n, the coupling between the m + 2 kink component and the m resonant component is found to induce the amplification of the resonant magnetic perturbation. The ergodicity and the 3D-displacement near the X-point induced by the resonant amplification can only partly explain the density pumpout observed in experiments.

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Section: Introductionmentioning

confidence: 99%

Non-linear modeling of the plasma response to RMPs in ASDEX Upgrade

et al. 2016

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“…However, the locked mode was excited at larger RMP amplitude and it caused disruption at even lower density. The operational window of RMP in TM suppression is similar to that of edge-localized mode control [45].…”

Section: Thresholds During the Interaction Between Rmp And Tmmentioning

confidence: 83%

Overview of the J-TEXT progress on RMP and disruption physics

Ding¹,

Chen²,

Zhang³

et al. 2018

Plasma Sci. Technol.

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The J-TEXT tokamak has been operated for 10 years since its first plasma obtained at the end of 2007. The diagnostics development and the main modulation systems, i.e. resonant magnetic perturbation (RMP) systems and the massive gas injection (MGI) systems, will be introduced in this paper. Supported by these efforts, J-TEXT has contributed to research on several topics, especially on the RMP physics and disruption mitigation. Both experimental and theoretical

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“…These peaks occur with a repetition rate ranging from 50 to 400 Hz in the explored conditions. In tokamak experiments this behavior is usually associated to the presence of ELM [23], filamentary plasma structures elongated along the magnetic field lines, characterized by a density higher than the surrounding plasma and ejected into the scrape off layer region. The bursty behavior of the D α monitor is related to the interaction of ELMs with the plasma wall or divertor plates.…”

Section: Edge Localized Em Structures During H-modementioning

confidence: 99%

H-mode achievement and edge features in RFX-mod tokamak operation

Spolaore¹,

Cavazzana²,

Marrelli³

et al. 2017

Nucl. Fusion

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The RFX-Mod experiment is a fusion device designed to operate as a Reversed Field Pinch (RFP), with a major radius R " 2 m and a minor radius a " 0.459 m. Its high versatility recently allowed operating also as an ohmic tokamak allowing comparative studies between the two configurations in the same device. The device is equipped with a state of the art MHD mode feedback control system, providing a magnetic boundary effective control and modulation, by applying resonant or nonresonant magnetic perturbations (MP) both in RFP and in tokamak configurations. In the fusion community the application of MPs is widely studied as a promising tool in particular to limit the impact of plasma filaments and ELMs, in particular on plasma facing components. An important issue is envisaged in the exploitation of the RFX-Mod active control system for ELM mitigation studies.As a first step in this direction, this paper will focus on the most recent achievements in term of RFX-Mod tokamak explored scenarios, which allowed the first investigation of the ohmic and edge biasing induced H-mode. In particular the realization of D-shaped tokamak discharges and the design and deployment of an insertable polarized electrode were accomplished. Both operations took advantage of the implementation of a real-time feedback control system of the electron density and of a multivariable shape feedback control system designed on a full modelbased approach. Indications of Ohmic H-mode were transiently observed during Single Null shaped plasmas. Stationary H-mode phases were instead obtained with insertable electrode biasing stimulation. The edge biasing is applied in new operation scenarios relatively unexplored with this technique in particular in plasma shaped Single Null discharges and in the very low-q circular plasma discharges, qpaq ă 2, achievable in RFX-Mod. Important modification of the edge plasma density and flow properties are observed as well as, in some cases, a complex "dithering" phenomenology, characterized by very fast L-H and H-L transitions. These strong fluctuations appear associated to the onset of MHD activity, whose behaviour will be analyzed and discussed in the paper along with the filamentary structures observed in the fast turbulence electromagnetic fluctuations.Published as a journal article in Nuclear Fusion http://iopscience.iop.org/article/Abstract The RFX-mod experiment is a fusion device designed to operate as a Reversed Field Pinch (RFP), with a major radius R= 2 m and a minor radius a = 0.459 m. Its high versatility recently allowed operating also as an ohmic tokamak allowing comparative studies between the two configurations in the same device. The device is equipped with a state of the art MHD mode feedback control system, providing a magnetic boundary effective control, by applying resonant or non-resonant magnetic perturbations (MP) both in RFP and in tokamak configurations. In the fusion community the application of MPs is widely studied as a promising tool to limit the impact of plasma filaments and ELMs on p...

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Edge Localized Mode (ELM)

Cited by 5 publications

References 160 publications

Non-linear modeling of the plasma response to RMPs in ASDEX Upgrade

Non-linear modeling of the plasma response to RMPs in ASDEX Upgrade

Overview of the J-TEXT progress on RMP and disruption physics

H-mode achievement and edge features in RFX-mod tokamak operation

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