In an effort to simulate the dynamic behavior of a non-ferromagnetic conducting structure with consideration of the magnetic damping effect, a finite element code is developed, which is based on the reduced vector pot...In an effort to simulate the dynamic behavior of a non-ferromagnetic conducting structure with consideration of the magnetic damping effect, a finite element code is developed, which is based on the reduced vector potential （At） method, the step-by-step integration algorithm and a time-partitioned strategy. An additional term is introduced to the conventional governing equations of eddy current problems to take into account the velocity-induced electric field corre- sponding to the magnetic damping effect. The TEAM-16 benchmark problem is simulated using the proposed method in conjunction with the commercial code ANSYS. The simulation results indicate that the proposed method has better simulation accuracy, especially in the presence of a high-intensity external magnetic field.展开更多
电子回旋共振加热系统在磁约束核聚变实验研究中有着很重要的作用。回旋管阳极供电需具备幅值快速可调、高稳定度以及波形前沿可变等条件。使用场效应管与快恢复二极管为主要器件研制出开关模块;在电路结构上将59个SM模块与同电压等级的...电子回旋共振加热系统在磁约束核聚变实验研究中有着很重要的作用。回旋管阳极供电需具备幅值快速可调、高稳定度以及波形前沿可变等条件。使用场效应管与快恢复二极管为主要器件研制出开关模块;在电路结构上将59个SM模块与同电压等级的1个BUCK电路依次串联起来。通过分别使用脉冲步进调制与高频脉冲宽度调制控制技术,实现输出幅值连续可调;并且研究了2种调制的控制方法,让输出波形的前沿时间既可在3 ms之内缓慢步进上升,也可以在60μs内快速输出。所有模块由数字信号处理器(DSP)控制的高频逆变电路实现恒压供电。样机实验结果证明:研制的电路与控制方法可行,整个电源输出的电压最大达到36 k V,电流200 m A,且全量程范围内连续可调,稳定度<1%。最大调制频率可以达到1 k Hz,可以在20μs完成各种关断保护,完全满足回旋管装置要求。展开更多
In Tokomak, the support of the ELM coil, which is close to the plasma and subject to high radiation level, high temperature and high magnetic field, is used to transport and bear the thermal load due to thermal expans...In Tokomak, the support of the ELM coil, which is close to the plasma and subject to high radiation level, high temperature and high magnetic field, is used to transport and bear the thermal load due to thermal expansion and the alternating electromagnetic force generated by high magnetic field and AC current in the coil. According to the feature of ITER ELM coil, the mechanical performance of rigid and flexible supports under different high nuclear heat levels is studied. Results show that flexible supports have more excellent performance in high nuclear heat condition than rigid supports. Concerning thermal and electromagnetic （EM） loads, optimized results further prove that flexible supports have better mechanical performance than rigid ones. Through these studies, reasonable support design can be provided for the ELM coils or similar coils in Tokamak based on the nuclear heat level.展开更多
基金supported by National Magnetic Confinement Fusion Science Program of China (No.2009GB104002)National Natural Science Foundation of China (Nos. 50977070,11021202 and 51007069)the National Basic Research Program of China (No. 2011CB610303)
文摘In an effort to simulate the dynamic behavior of a non-ferromagnetic conducting structure with consideration of the magnetic damping effect, a finite element code is developed, which is based on the reduced vector potential （At） method, the step-by-step integration algorithm and a time-partitioned strategy. An additional term is introduced to the conventional governing equations of eddy current problems to take into account the velocity-induced electric field corre- sponding to the magnetic damping effect. The TEAM-16 benchmark problem is simulated using the proposed method in conjunction with the commercial code ANSYS. The simulation results indicate that the proposed method has better simulation accuracy, especially in the presence of a high-intensity external magnetic field.
文摘电子回旋共振加热系统在磁约束核聚变实验研究中有着很重要的作用。回旋管阳极供电需具备幅值快速可调、高稳定度以及波形前沿可变等条件。使用场效应管与快恢复二极管为主要器件研制出开关模块;在电路结构上将59个SM模块与同电压等级的1个BUCK电路依次串联起来。通过分别使用脉冲步进调制与高频脉冲宽度调制控制技术,实现输出幅值连续可调;并且研究了2种调制的控制方法,让输出波形的前沿时间既可在3 ms之内缓慢步进上升,也可以在60μs内快速输出。所有模块由数字信号处理器(DSP)控制的高频逆变电路实现恒压供电。样机实验结果证明:研制的电路与控制方法可行,整个电源输出的电压最大达到36 k V,电流200 m A,且全量程范围内连续可调,稳定度<1%。最大调制频率可以达到1 k Hz,可以在20μs完成各种关断保护,完全满足回旋管装置要求。
文摘In Tokomak, the support of the ELM coil, which is close to the plasma and subject to high radiation level, high temperature and high magnetic field, is used to transport and bear the thermal load due to thermal expansion and the alternating electromagnetic force generated by high magnetic field and AC current in the coil. According to the feature of ITER ELM coil, the mechanical performance of rigid and flexible supports under different high nuclear heat levels is studied. Results show that flexible supports have more excellent performance in high nuclear heat condition than rigid supports. Concerning thermal and electromagnetic （EM） loads, optimized results further prove that flexible supports have better mechanical performance than rigid ones. Through these studies, reasonable support design can be provided for the ELM coils or similar coils in Tokamak based on the nuclear heat level.
