Controlled nuclear fusion represents a significant solution for future clean energy,with ion cyclotron range of frequency(ICRF)heating emerging as one of the most promising technologies for heating the fusion plasma.T...Controlled nuclear fusion represents a significant solution for future clean energy,with ion cyclotron range of frequency(ICRF)heating emerging as one of the most promising technologies for heating the fusion plasma.This study primarily presents a self-developed 2D ion cyclotron resonance antenna electromagnetic field solver(ICRAEMS)code implemented on the MATLAB platform,which solves the electric field wave equation by using the finite element method,establishing perfectly matched layer(PML)boundary conditions,and post-processing the electromagnetic field data.This code can be utilized to facilitate the design and optimization processes of antennas for ICRF heating technology.Furthermore,this study examines the electric field distribution and power spectrum associated with various antenna phases to investigate how different antenna configurations affect the electromagnetic field propagation and coupling characteristics.展开更多
The electromagnetic wave propagations and their coupling characteristics in magnetized plasma near the antenna of ion cyclotron range of frequencies(ICRF)is studied based on self-developed 3DFEM-IA code.This code effe...The electromagnetic wave propagations and their coupling characteristics in magnetized plasma near the antenna of ion cyclotron range of frequencies(ICRF)is studied based on self-developed 3DFEM-IA code.This code effectively resolves the three-dimensional(3D)geometry and the electromagnetic field using the finite element method.Our findings reveal that the distributions of electromagnetic fields and energy flow density significantly depend on the antenna phases,surface current density on the antenna straps,and background plasma density.Notably,the non-uniform surface current density on the antenna straps,resulting from the presence of induced currents,contributes to a reduction in coupling power within the edge plasma.Furthermore,the calculated coupling impedance increases with plasma density,corroborating well with experimental measurements.展开更多
在有离子回旋共振频率（ICRF）加热和改变等离子体密度的情况下，在JET托卡马克中进行的放电中，已研究了在甚高快离子能含量时锯齿稳定问题，等离子体密度的改变是通过吹氘气加以控制的，在这些实验中，已观测到锯齿性能的惊人差别，...在有离子回旋共振频率（ICRF）加热和改变等离子体密度的情况下，在JET托卡马克中进行的放电中，已研究了在甚高快离子能含量时锯齿稳定问题，等离子体密度的改变是通过吹氘气加以控制的，在这些实验中，已观测到锯齿性能的惊人差别，当等离子体密度nc减小到低于某个阈值时，居齿频率和崩塌持续时间增加5倍，因为由于快离子慢化时间与nc成反比而快离子能含量随nc减小而增加，所以nc阈值相应于快离子能含量阈值，在这些实验中，当快离子能量对总等离子体抗磁能含量的贡献变得大于45％时达到此阈值，在频率介于55和65kHz之间，环向模数n=1时，有短的无锯齿周期的锯齿活性伴随有MHD活性，这种活性解释为与ICRF驱动的快离子共振的高能粒子鱼骨模，看来实验结果是与锯齿和鱼骨模的稳定性图一致的[White 1989:Theory of Tokamak Plasmas(Amsterdam:North-Holland)]，探索在此图中有甚大快离子群体的那部分。展开更多
Two new ICRF antennas operating in the ion cyclotron radio frequency(ICRF) range have been developed for EAST to overcome the low coupling problem of the original antennas.The original ICRF antennas were limited in th...Two new ICRF antennas operating in the ion cyclotron radio frequency(ICRF) range have been developed for EAST to overcome the low coupling problem of the original antennas.The original ICRF antennas were limited in their power capacity due to insufficient coupling.The new antenna design takes into account both wave coupling and absorption processes through comprehensive wave coupling and absorption codes,with the dominant parallel wave number k∥of 7.5 m-1at dipole phasing.Through the use of these new ICRF antennas,we are able to achieve 3.8 MW output power and 360 s operation,respectively.The initial experimental results demonstrate the reliability of the antenna design method.展开更多
The experimental advanced superconducting Tokamak has two suits of ion cyclotron radio frequency heating systems, in which the two antennas are of different structures. Their performance is assessed and compared by CS...The experimental advanced superconducting Tokamak has two suits of ion cyclotron radio frequency heating systems, in which the two antennas are of different structures. Their performance is assessed and compared by CST microwave studio. The radiating capacity of antennas and the arcing around them are estimated. The impurity release is analyzed by the radio frequency(RF) potential in the plasma sheath. The simulation results show that the radiating capacity for the folded antenna(I-port) is better than those for the double loops antenna(B-port). However,the folded antenna is worse than the double loops antenna in terms of breakdown. Moreover, the impurity production is relevant to spectrum shaping. The RF potential at(0, π,π, 0) phasing with the peak of spectrum k//= 8.5 m^(-1)is lower than the one with other phases. The impurity is reduced obviously when the folded antenna is powered with(0, π, π, 0) phasing.展开更多
基金Project supported by the National MCF Energy R&D Program(Grant No.2022YFE03190100)the National Natural Science Foundation of China(Grant Nos.12422513,12105035,and U21A20438)the Xiaomi Young Talents Program.
文摘Controlled nuclear fusion represents a significant solution for future clean energy,with ion cyclotron range of frequency(ICRF)heating emerging as one of the most promising technologies for heating the fusion plasma.This study primarily presents a self-developed 2D ion cyclotron resonance antenna electromagnetic field solver(ICRAEMS)code implemented on the MATLAB platform,which solves the electric field wave equation by using the finite element method,establishing perfectly matched layer(PML)boundary conditions,and post-processing the electromagnetic field data.This code can be utilized to facilitate the design and optimization processes of antennas for ICRF heating technology.Furthermore,this study examines the electric field distribution and power spectrum associated with various antenna phases to investigate how different antenna configurations affect the electromagnetic field propagation and coupling characteristics.
基金Project supported by the National MCF Energy Research and Development Program(Grant No.2022YFE03190100)the National Natural Science Foundation of China(Grant Nos.12422513,12105035,and U21A20438)the Xiaomi Young Talents Program。
文摘The electromagnetic wave propagations and their coupling characteristics in magnetized plasma near the antenna of ion cyclotron range of frequencies(ICRF)is studied based on self-developed 3DFEM-IA code.This code effectively resolves the three-dimensional(3D)geometry and the electromagnetic field using the finite element method.Our findings reveal that the distributions of electromagnetic fields and energy flow density significantly depend on the antenna phases,surface current density on the antenna straps,and background plasma density.Notably,the non-uniform surface current density on the antenna straps,resulting from the presence of induced currents,contributes to a reduction in coupling power within the edge plasma.Furthermore,the calculated coupling impedance increases with plasma density,corroborating well with experimental measurements.
文摘在有离子回旋共振频率（ICRF）加热和改变等离子体密度的情况下，在JET托卡马克中进行的放电中，已研究了在甚高快离子能含量时锯齿稳定问题，等离子体密度的改变是通过吹氘气加以控制的，在这些实验中，已观测到锯齿性能的惊人差别，当等离子体密度nc减小到低于某个阈值时，居齿频率和崩塌持续时间增加5倍，因为由于快离子慢化时间与nc成反比而快离子能含量随nc减小而增加，所以nc阈值相应于快离子能含量阈值，在这些实验中，当快离子能量对总等离子体抗磁能含量的贡献变得大于45％时达到此阈值，在频率介于55和65kHz之间，环向模数n=1时，有短的无锯齿周期的锯齿活性伴随有MHD活性，这种活性解释为与ICRF驱动的快离子共振的高能粒子鱼骨模，看来实验结果是与锯齿和鱼骨模的稳定性图一致的[White 1989:Theory of Tokamak Plasmas(Amsterdam:North-Holland)]，探索在此图中有甚大快离子群体的那部分。
基金supported by the National Key Research and Development Program of China (Nos. 2019YFE03070000and 2019YFE03070003)National Natural Science Foundation of China (Nos. 11975265 and 11775258)+2 种基金Comprehensive Research Facility for Fusion Technology Program of China (No. 2018-000052-73-01-001228)the Open Fund of Magnetic Confinement Fusion Laboratory of Anhui Province (No. 2021AMF01001)Hefei Science Center,CAS(No. 2021HSC-KPRD001)。
文摘Two new ICRF antennas operating in the ion cyclotron radio frequency(ICRF) range have been developed for EAST to overcome the low coupling problem of the original antennas.The original ICRF antennas were limited in their power capacity due to insufficient coupling.The new antenna design takes into account both wave coupling and absorption processes through comprehensive wave coupling and absorption codes,with the dominant parallel wave number k∥of 7.5 m-1at dipole phasing.Through the use of these new ICRF antennas,we are able to achieve 3.8 MW output power and 360 s operation,respectively.The initial experimental results demonstrate the reliability of the antenna design method.
基金Supported by the National Magnetic Confinement Fusion Science Program of China(No.2015GB101001)the Natural Science Foundation of China(No.11375236)
文摘The experimental advanced superconducting Tokamak has two suits of ion cyclotron radio frequency heating systems, in which the two antennas are of different structures. Their performance is assessed and compared by CST microwave studio. The radiating capacity of antennas and the arcing around them are estimated. The impurity release is analyzed by the radio frequency(RF) potential in the plasma sheath. The simulation results show that the radiating capacity for the folded antenna(I-port) is better than those for the double loops antenna(B-port). However,the folded antenna is worse than the double loops antenna in terms of breakdown. Moreover, the impurity production is relevant to spectrum shaping. The RF potential at(0, π,π, 0) phasing with the peak of spectrum k//= 8.5 m^(-1)is lower than the one with other phases. The impurity is reduced obviously when the folded antenna is powered with(0, π, π, 0) phasing.
