First Results of Pellet Injection Experiments on EAST

Li, Changzheng

doi:10.1088/1009-0630/16/10/03

Cited by 11 publications

(9 citation statements)

References 19 publications

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“…Since 2012, a PI system [31] with the frequency of 10 Hz has been installed on EAST. During subsequent pellet experiments, which are usually performed with the fueling effect [31] and ELM triggering [32], many interesting and novel results concerning L-H transition have been obtained [33]. Similar to the dithering cycles mentioned above, dithering-like cycles induced by deuterium PI have also been observed during 2018 campaigns on EAST tokamak.…”

Section: Introductionmentioning

confidence: 57%

Investigation of the dithering-like cycles induced by deuterium pellet injection during ELMy H-mode plasmas on EAST

Huang¹,

Wang²,

Hou³

et al. 2020

Nucl. Fusion

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By injecting cryogenic deuterium pellets into H-mode plasmas with edge localized modes (ELMs) from the low-field side (LFS) on EAST tokamak, the impact of these pellets on the edge plasma can be investigated. In some cases of pellet injection (PI), the intermediate phase (I-phase), i.e, the dithering-like cycles, have been observed. Experiments show that during one dithering-like cycle, three phases can be distinguished, which are closely related to the variations in the pedestal density profiles and density gradient after PI. Phase 1 is characterized by rapid particle loss and a density pedestal crash, phase 2 has a relatively low density gradient and enhanced edge density fluctuation and phase 3 corresponds to the relatively fast recovery of the density pedestal and reduced edge density fluctuation. Through an experimental analysis, it is shown that the plasma will enter the I-phase when the edge line-averaged density increases beyond a certain threshold value after PI. H-I-H transitions are more likely to be observed when the edge line-averaged density is greater than the core line-averaged density.

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Section: Introductionmentioning

confidence: 57%

Investigation of the dithering-like cycles induced by deuterium pellet injection during ELMy H-mode plasmas on EAST

Huang¹,

Wang²,

Hou³

et al. 2020

Nucl. Fusion

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“…Since 2014, the EAST has been investigating ELM control with the most existing methods, including resonant magnetic perturbations (RMPs), 41 pellet pacing, 42 supersonic molecular beam injection, 43 LHWs, 44 and Li pellet injection, 45 allowing it to achieve long-pulse steady-state operation. The nonlinear transition from mitigation to suppression of the ELMs by using RMPs was first observed in the EAST in 2016.…”

Section: The East Project and Related Activitiesmentioning

confidence: 99%

Recent progress in Chinese fusion research based on superconducting tokamak configuration

et al. 2022

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“…The pellet injector, based on a screw extruder, is able to fire pellets in the steady-state mode with a reliability greater than 95%. Typical phenomena such as ELM triggering and electron temperature drop, which are associated with deuterium pellet injection experiments, have been observed and summarized in a previous work [8]. This paper mainly focuses on the temporary divertor plasma detachment with MARFE events induced by pellet injection.…”

Section: Introductionmentioning

confidence: 95%

Achieving temporary divertor plasma detachment with MARFE events by pellet injection in the EAST superconducting tokamak

Deng

Wang

Liu

et al. 2016

Plasma Sci. Technol.

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A new pellet injection system has been equipped on the experimental advanced superconducting tokamak (EAST) in the 2012 campaign, with a pellet size of f 2 mm×2 mm, a frequency of 1 Hz-10 Hz and velocity of 150 m s −1-300 m s −1. The deuterium pellet is well-known for plasma fuelling as well as for triggering the edge localized mode (ELM). In the 2012 campaign, pellet injection experiments were successfully carried out on EAST. Temporary plasma detachment achieved by deuterium pellets has been observed in a double null (DN) divertor configuration, with multi-pellet injections at a repetition frequency of 2 Hz. The partial detachment of the outer divertors and complete detachment of the inner divertors was achieved after 35 ms of each pellet injection, which have a duration of 30-60 ms with the maximum degree of detachment (DOD) reaching 3.5 and 37, respectively. Meanwhile, the multifaceted asymmetric radiation from the edge (MARFE) phenomena was also observed at the high field side (HFS) near both the lower and upper X-points with radiation loss suddenly increased to about 15%-70%, which may be the main cause of divertor plasma detachment. The temporary detachment induced by pellet injection may act as a new way to study divertor detachment behaviors.

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First Results of Pellet Injection Experiments on EAST

Cited by 11 publications

References 19 publications

Investigation of the dithering-like cycles induced by deuterium pellet injection during ELMy H-mode plasmas on EAST

Investigation of the dithering-like cycles induced by deuterium pellet injection during ELMy H-mode plasmas on EAST

Recent progress in Chinese fusion research based on superconducting tokamak configuration

Achieving temporary divertor plasma detachment with MARFE events by pellet injection in the EAST superconducting tokamak

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