Configuration analysis and optimization on multipolar Galatea trap
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AGNETIC CONFINEMENT SYSTEMS
Configuration Analysis and Optimization on Multipolar GALATEA Trap1 W. M. Tong*, B. Q. Tao, X. J. Jin, and Z. W. Li School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin, China *e-mail: [email protected] Received August 7, 2015; in final form, December 28, 2015
Abstract—Multipolar Galatea magnetic trap simulation model was established with the finite element simulation software COMSOL Multiphysics. Analyses about the magnetic section configuration show that better magnetic configuration should make more plasma stay in the weak magnetic field rather than the annular magnetic shell field. Then an optimization model was established with axial electromagnetic force, weak magnetic field area and average magnetic mirror ratio as the optimization goals and with the currents of myxines as design variables. Select appropriate weight coefficients and get optimization results by applying genetic algorithm. Results show that the superiority of the target value of typical application parameters, including the average magnetic mirror can reduce more than 5%, the weak magnetic field area can increase at least 65%, at the same time, axial electromagnetic force acting on the outer myxines can be reduced to less than 50 N. Finally, the results were proved by COMSOL Multiphysics and the results proved the optimized magnetic trap configuration with more plasma in the weak magnetic field can reduce the plasma diffusion velocity and is more conducive for the constraint of plasma. DOI: 10.1134/S1063780X1610007X
1. INTRODUCTION Multipolar Galatea trap can automatically suppress plasma diamagnetic instability [1, 2]. This device belongs to internal conductor device with current carrying conductors immersed in the plasma. However, since the coils are submerged in the plasma, most of the researches on Galatea were restricted in connection with the technical complications and inconveniences, such as the coil ablation, the plasma loss caused by the holders. However, the situation is now reversed in connection with the development of hightemperature superconductors and the technology around them. The multilayer superconducting compound coils [3] and the magnetic levitation technology [4] have been investigated. So, the fundamental advantages of Galatea will be brought to the fore in the near future. The parameters design of multipolar Galatea trap coil is very important for the design of Galatea magnetic confinement device because reasonable coil parameters can provide better magnetic field configuration. The magnetic trap coil parameters for the barrier magnetic field of 0.022 and 0.11 T are given in [5, 6], but there are no concrete methods for the design method of magnetic trap coil parameters. Multipolar Galatea magnetic trap simulation model was established with the finite element simulation software 1 The article is published in the original.
COMSOL Multiphysics [7, 8]. Analyses about the magnetic section configuration show that the plasma in the weak magnetic field will be p
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