Study of the radiated energy loss during massive gas injection mitigated disruptions on EAST

The MGI mitigated disruption experiments were carried out on EAST with a new fast gas controlling valve in 2012. Different amounts of noble gas He or mixed gas of 99% He+1% Ar are injected into plasma in current flat-top phase and current ramp-down phase separately. The initial results of MGI experi...

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Veröffentlicht in:Journal of nuclear materials 2015-08, Vol.463, p.727-730
Hauptverfasser: Duan, Y.M., Hao, Z.K., Hu, L.Q., Wang, L., Xu, P., Xu, L.Q., Zhuang, H.D.
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container_end_page 730
container_issue
container_start_page 727
container_title Journal of nuclear materials
container_volume 463
creator Duan, Y.M.
Hao, Z.K.
Hu, L.Q.
Wang, L.
Xu, P.
Xu, L.Q.
Zhuang, H.D.
description The MGI mitigated disruption experiments were carried out on EAST with a new fast gas controlling valve in 2012. Different amounts of noble gas He or mixed gas of 99% He+1% Ar are injected into plasma in current flat-top phase and current ramp-down phase separately. The initial results of MGI experiments are described. The MGI system and the radiation measurement system are briefly introduced. The characteristics of radiation distribution and radiation energy loss are analyzed. About 50% of the stored thermal energy Wdia is dissipated by radiation during the entire disruption process and the impurities of C and Li from the PFC play important roles to radiative energy loss. The amount of the gas can affect the pre-TQ phase. Strong poloidal asymmetry of radiation begins to appear in the CQ phase, which is possibly caused by the plasma configuration changes as a result of VDE. No toroidal radiation asymmetry is observed presently.
doi_str_mv 10.1016/j.jnucmat.2014.10.067
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subjects Asymmetry
Disruption
Dissipation
Gas injection
Nuclear engineering
Radiation distribution
Radiation measurement
Valves
title Study of the radiated energy loss during massive gas injection mitigated disruptions on EAST
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