Over the past few years,phonon detectors have emerged as a prevailing technology for detecting lowmass dark matter due to their low thresholds and high resolution.These detectors,which employ either dual-phase detecto...Over the past few years,phonon detectors have emerged as a prevailing technology for detecting lowmass dark matter due to their low thresholds and high resolution.These detectors,which employ either dual-phase detectors combining phonon-light or phonon-electron interactions,have significantly advanced direct dark matter detection efforts.Argon,as a low-background and high-reserve detection medium,has also played a crucial role in this field.Both liquid-argon single-phase detectors and gas-liquid two-phase time projection chambers(TPCs)have contributed substantially to the direct detection of high-mass dark matter.By integrating these distinct detector types,the upper limits of the corresponding mass cross-section in dark matter detection can be lowered.We propose a phonon detector utilizing solid argon as the absorber,which combines the advantages of both aforementioned detector types.However,due to the requirement for an ultra-low temperature environment in the tens of millikelvin(mK)range,experimental investigations of solid argon phonon detector performance are currently constrained by technical limitations.Therefore,the performance analysis of the solid argon phonon detector presented in this study is only based on sapphire phonon detectors.Although there may be discrepancies between this approximation and the actual performance,the intrinsic characteristics of phonon detectors permit a qualitative evaluation of the solid argon phonon detector's potential capabilities.展开更多
The effects of equilibrium toroidal rotation during edge-localized mode(ELM)mitigated by resonant magnetic perturbation(RMP)are studied with the experimental equilibria of the EAST tokamak based on the four-field mode...The effects of equilibrium toroidal rotation during edge-localized mode(ELM)mitigated by resonant magnetic perturbation(RMP)are studied with the experimental equilibria of the EAST tokamak based on the four-field model in the BOUT++code.As the two main parameters to determine the toroidal rotation profiles,the rotation shear and magnitudes were separately scanned to investigate their roles in the impact of RMPs on peeling-ballooning(P-B)modes.On one hand,the results show that strong toroidal rotation shear is favorable for the enhancement of the self-generated E×B shearing rate<ω_(E×B)>with RMPs,leading to significant ELM mitigation with RMP in the stronger toroidal rotation shear region.On the other hand,toroidal rotation magnitudes may affect ELM mitigation by changing the penetration of the RMPs,more precisely the resonant components.RMPs can lead to a reduction in the pedestal energy loss by enhancing the multimode coupling in the turbulence transport phase.The shielding effects on RMPs increase with the toroidal rotation magnitude,leading to the enhancement of the multimode coupling with RMPs to be significantly weakened.Hence,the reduction in pedestal energy loss by RMPs decreased with the rotation magnitude.In brief,the results show that toroidal rotation plays a dual role in ELM mitigation with RMP by changing the shielding effects of plasma by rotation magnitude and affecting<ω_(E×B)>by rotation shear.In the high toroidal rotation region,toroidal rotation shear is usually strong and hence plays a dominant role in the influence of RMP on P-B modes,whereas in the low rotation region,toroidal rotation shear is weak and has negligible impact on P-B modes,and the rotation magnitude plays a dominant role in the influence of RMPs on the P-B modes by changing the field penetration.Therefore,the dual role of toroidal rotation leads to stronger ELM mitigation with RMP,which may be achieved both in the low toroidal rotation region and the relatively high rotation region that has strong rotational shear.展开更多
基金the National Key Research and Development Program of China(2017YFA0402203)the National Natural Science Foundation of China(12075161)。
文摘Over the past few years,phonon detectors have emerged as a prevailing technology for detecting lowmass dark matter due to their low thresholds and high resolution.These detectors,which employ either dual-phase detectors combining phonon-light or phonon-electron interactions,have significantly advanced direct dark matter detection efforts.Argon,as a low-background and high-reserve detection medium,has also played a crucial role in this field.Both liquid-argon single-phase detectors and gas-liquid two-phase time projection chambers(TPCs)have contributed substantially to the direct detection of high-mass dark matter.By integrating these distinct detector types,the upper limits of the corresponding mass cross-section in dark matter detection can be lowered.We propose a phonon detector utilizing solid argon as the absorber,which combines the advantages of both aforementioned detector types.However,due to the requirement for an ultra-low temperature environment in the tens of millikelvin(mK)range,experimental investigations of solid argon phonon detector performance are currently constrained by technical limitations.Therefore,the performance analysis of the solid argon phonon detector presented in this study is only based on sapphire phonon detectors.Although there may be discrepancies between this approximation and the actual performance,the intrinsic characteristics of phonon detectors permit a qualitative evaluation of the solid argon phonon detector's potential capabilities.
基金supported by the National MCF Energy R&D Program of China(Nos.2019YFE03090400 and 2019YFE03030004)National Natural Science Foundation of China(Nos.12375222 and 11775154)National Key R&D Program of China(Nos.2017YFE0301203 and 2017YFE0301101)。
文摘The effects of equilibrium toroidal rotation during edge-localized mode(ELM)mitigated by resonant magnetic perturbation(RMP)are studied with the experimental equilibria of the EAST tokamak based on the four-field model in the BOUT++code.As the two main parameters to determine the toroidal rotation profiles,the rotation shear and magnitudes were separately scanned to investigate their roles in the impact of RMPs on peeling-ballooning(P-B)modes.On one hand,the results show that strong toroidal rotation shear is favorable for the enhancement of the self-generated E×B shearing rate<ω_(E×B)>with RMPs,leading to significant ELM mitigation with RMP in the stronger toroidal rotation shear region.On the other hand,toroidal rotation magnitudes may affect ELM mitigation by changing the penetration of the RMPs,more precisely the resonant components.RMPs can lead to a reduction in the pedestal energy loss by enhancing the multimode coupling in the turbulence transport phase.The shielding effects on RMPs increase with the toroidal rotation magnitude,leading to the enhancement of the multimode coupling with RMPs to be significantly weakened.Hence,the reduction in pedestal energy loss by RMPs decreased with the rotation magnitude.In brief,the results show that toroidal rotation plays a dual role in ELM mitigation with RMP by changing the shielding effects of plasma by rotation magnitude and affecting<ω_(E×B)>by rotation shear.In the high toroidal rotation region,toroidal rotation shear is usually strong and hence plays a dominant role in the influence of RMP on P-B modes,whereas in the low rotation region,toroidal rotation shear is weak and has negligible impact on P-B modes,and the rotation magnitude plays a dominant role in the influence of RMPs on the P-B modes by changing the field penetration.Therefore,the dual role of toroidal rotation leads to stronger ELM mitigation with RMP,which may be achieved both in the low toroidal rotation region and the relatively high rotation region that has strong rotational shear.
