论文部分内容阅读
为了在多极Galatea磁阱等离子体约束实验中获得更精确的等离子体参数,利用Rogowski线圈测量了多极磁阱中等离子体的逆磁电流,并借助COMSOL有限元软件分析了磁阱的磁场和等离子体逆磁电流的分布特点,建立了逆磁电流和等离子体分界面处压强之间的数学模型;结合理想气体方程,给出了利用逆磁电流估算等离子体能量约束时间和等离子体温度的方法,并根据测量的逆磁电流计算了不同障壁磁场下多极磁阱中等离子体的主要参数。计算结果表明,障壁磁场磁感应强度在0.025~0.1 T之间变化时,逆磁电流最大值的变化范围为60~110 A,磁阱分界面处压强变化范围为9~14 Pa,等离子体的能量约束时间变化范围为50~150μs。根据上述测量结果和所提模型估算的等离子体温度约为10 e V,这与热量计测量的等离子体温度基本一致,证明了在等离子体浓度的数值已知的情况下,可以通过测量逆磁电流来测定磁阱中的等离子压强、等离子约束能量时间和等离子体温度。
In order to obtain more accurate plasma parameters in the multi-pole Galatea trap experiments, the Rogowski coil was used to measure the inverse magnetization current of the plasma in the multipole trap. The magnetic field of the trap and its magnetic field were analyzed by COMSOL finite element software And the mathematical model of the relationship between the inverse magnetizing current and the pressure at the plasma interface is established. Based on the ideal gas equation, the method of estimating the plasma confinement time and the plasma temperature by using the inverse magnetic current is given Method and the main parameters of the plasma in the multipole magnetic trap under different barrier magnetic fields are calculated based on the measured inverse magnetic current. The results show that when the magnetic flux density of barrier wall varies from 0.025 to 0.1 T, the maximum range of reverse magneto-electric current varies from 60 to 110 A, and the pressure at the interface between the magnetic well and the trap ranges from 9 to 14 Pa. The energy of the plasma The constraint time varies from 50 to 150 μs. The plasma temperature estimated from the above measurements and the proposed model is about 10 eV, which is basically the same as the plasma temperature measured by the calorimeter. It is proved that when the value of the plasma concentration is known, Current is used to determine the plasma pressure in the magnetic trap, the plasma confinement energy time, and the plasma temperature.