Suppression of runaway electron generation by massive helium injection after induced disruptions on TEXTOR

Lvovskiy, A.; Koslowski, H. R.; Zeng, Long

doi:10.1017/s0022377815001051

Cited by 9 publications

(9 citation statements)

References 51 publications

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“…It is suggested that the separation of the primary generation and the RE avalanche onset gives a narrow time window to suppress seed REs with a lower electron density before the RE avalanche onset, which will be much less than the previous prediction of the Rosenbluth no-avalanche density, ∼10 22 m −3 , for ITER [2]. The expected method for RE suppression appears to be consistent with the observation in the TEXTOR mitigation experiments, in which no generation of REs has been observed during disruptions when more than a critical amount of helium has been injected no later than 5 ms after the triggering of the first valve [33].…”

Section: Discussionsupporting

confidence: 79%

Observation of two threshold fields for runaway-electron generation in tokamaks

et al. 2020

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Two different threshold electric fields, characterizing a lower field required for significant seed RE generation and sustainment and a higher field required for the RE avalanche onset, have been experimentally observed in the flattop of EAST discharges. These results demonstrate that the threshold electric field for the RE avalanche onset is 1.2-fold higher than the RE detection onset field required for the primary generation. An updated 0-D model, including the delay in the RE avalanche onset, suggests that the RE population should be less than the previous prediction. The delay in the RE avalanche onset also opens a possibility for RE suppression at relatively low electron density.

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Section: Discussionsupporting

confidence: 79%

Observation of two threshold fields for runaway-electron generation in tokamaks

et al. 2020

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“…The number of injected Argon particles in the three discharges is the same. The maximum electron density mainly depends on the number of injected Argon particles (Bozhenkov et al 2008;Lvovskiy et al 2015). Meanwhile, the loop voltages in the three discharges, measured by the flux loop mounted internal to the vacuum vessel and shown in Fig.…”

Section: Experimental Setup and Resultsmentioning

confidence: 99%

Experimental observation of hot tail runaway electron generation in TEXTOR disruptions

et al. 2015

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Experimental evidence supporting the theory of hot tail runaway electron (RE) generation has been identified in TEXTOR disruptions. With higher temperature, more REs are generated during the thermal quench. Increasing the RE generation by increasing the temperature, an obvious RE plateau is observed even with low toroidal magnetic field (1.7 T). These results explain the previously found electron density threshold for RE generation.

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“…When we take E = ηj at the TQ where j is the plasma current density and η the Spitzer resistivity, E ∝ − T e 7 show that more RE current is formed with higher temper ature (or lower electron density) before disruptions, which could not be simply explained only by the Dreicer mechanism. Moreover, the plasma electron density evolution during the disruptions mainly depends on the number of injected argon particles [36]. The electron density and its temporal change during the disruption in the two shots are similar due to the same amount of argon injection, showing a strong increase with respect to the pre-disruption electron density.…”

Section: Re Generation Dependence On Pre-disruption Electron Densitymentioning

confidence: 95%

Runaway electron generation during disruptions in the J-TEXT tokamak

et al. 2017

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A systematic study of disruption-generated runaway electrons has been performed in the J-TEXT tokamak. During the intended disruption by the argon injection in J-TEXT, the runaway electron plateau is more easily obtained with a higher loop voltage and shorter onset time of high loop voltage. Magnetic fluctuations are observed at the beginning of the current quench during the disruptions. The generated runaway electron (RE) current is larger at a lower level of magnetic fluctuation. Experimental evidence supporting that the theory of hot tail RE generation might be playing a role has also been found. With higher temperature before the disruption, more REs are generated via the hot tail mechanism during the thermal quench. By increasing the hot tail RE generation by increasing the temperature, an obvious RE plateau is observed even with a low toroidal magnetic field (1.2 T).

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Suppression of runaway electron generation by massive helium injection after induced disruptions on TEXTOR

Cited by 9 publications

References 51 publications

Observation of two threshold fields for runaway-electron generation in tokamaks

Observation of two threshold fields for runaway-electron generation in tokamaks

Experimental observation of hot tail runaway electron generation in TEXTOR disruptions

Runaway electron generation during disruptions in the J-TEXT tokamak

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