On HL-2A,two different injections（supersonic molecular beam injection（SMBI）and pellet injection（PI）） are used to mitigate edge localized mode（ELM）-filament convective transport.The changes of their characteris...On HL-2A,two different injections（supersonic molecular beam injection（SMBI）and pellet injection（PI）） are used to mitigate edge localized mode（ELM）-filament convective transport.The changes of their characteristics are studied in this paper.A high spatiotemporal resolution probe shows there are many similar phenomena,and the filament density amplitude and radial velocity are both suppressed.Our statistical results indicate that：the velocity suppression comes from the decrease of filament density and temperature;the transient particle and heat fluxes drop strongly;and long-range correlation along a magnetic flux surface also decreases,when the electron-ion collisionality increases significantly,which may have a role on the filament parallel current during ELM mitigation.展开更多
On the EAST tokamak,filament-like structures have been observed in ELMy H-mode discharges with a high-speed vacuum ultraviolet (VUV) imaging system.The topos,chronos and their weight can be obtained simultaneously by ...On the EAST tokamak,filament-like structures have been observed in ELMy H-mode discharges with a high-speed vacuum ultraviolet (VUV) imaging system.The topos,chronos and their weight can be obtained simultaneously by performing the so-called singular value decomposition (SVD) analysis of raw VUV imaging data.The fluctuation amplitude is observed to be suppressed and enhanced gradually in the edge localized mode (ELM) crash and pedestal recovery phase in the chronos,respectively,while filament-like structures can only be found in the pedestal recovery phase on the topos.The mode structure,i.e.m/n =36/9 (m and n are the poloidal and toroidal mode number,respectively) with ρ0 =0.95,w0 =0.07 (ρ0 and w0 denote the mode location and mode width,respectively) is derived by a comparison of the synthetic images and the experimental imaging data.展开更多
基金supported by National Natural Science Foundation of China(Nos.11075046,10975049,11375054,11275060)the National Magnetic Confinement Fusion Science Program of China(Nos.2013GB112008,2013GB107000,2013GB104002,2014GB107000,2014GB108000)the China-Korean Joint Research Program(No.2012DFG02230)
文摘On HL-2A,two different injections（supersonic molecular beam injection（SMBI）and pellet injection（PI）） are used to mitigate edge localized mode（ELM）-filament convective transport.The changes of their characteristics are studied in this paper.A high spatiotemporal resolution probe shows there are many similar phenomena,and the filament density amplitude and radial velocity are both suppressed.Our statistical results indicate that：the velocity suppression comes from the decrease of filament density and temperature;the transient particle and heat fluxes drop strongly;and long-range correlation along a magnetic flux surface also decreases,when the electron-ion collisionality increases significantly,which may have a role on the filament parallel current during ELM mitigation.
基金by the National Natural Science Foundation of China (Nos. 11605244, 11875294, 11505221)the National Magnetic Confinement Fusion Science Program of China (Nos. 2014GB106000 and 2014GB106001)
文摘On the EAST tokamak,filament-like structures have been observed in ELMy H-mode discharges with a high-speed vacuum ultraviolet (VUV) imaging system.The topos,chronos and their weight can be obtained simultaneously by performing the so-called singular value decomposition (SVD) analysis of raw VUV imaging data.The fluctuation amplitude is observed to be suppressed and enhanced gradually in the edge localized mode (ELM) crash and pedestal recovery phase in the chronos,respectively,while filament-like structures can only be found in the pedestal recovery phase on the topos.The mode structure,i.e.m/n =36/9 (m and n are the poloidal and toroidal mode number,respectively) with ρ0 =0.95,w0 =0.07 (ρ0 and w0 denote the mode location and mode width,respectively) is derived by a comparison of the synthetic images and the experimental imaging data.
