Effect of Specific Pressure of Fast Particles on Double-Tearing Mode of Resistance Magnetic Fluid
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GENERAL AND APPLIED PHYSICS
Effect of Specific Pressure of Fast Particles on Double-Tearing Mode of Resistance Magnetic Fluid ZW Wan 1 Received: 23 September 2020 / Accepted: 21 October 2020 # Sociedade Brasileira de Física 2020
Abstract In the advanced Tokamak magnetic field configuration, the instability of the double tear mode excited by the diamagnetic shear configuration plays an important role. At the same time, due to the fusion reaction and auxiliary heating means, a large number of fast particles will be generated. The existence of fast particles will affect the growth of double tear mode. In the context of resistive magnetic fluids, the role of fast particle specific pressure in the instability of the double tear mode was analyzed, and the CLT-K program was used to simulate the instability of the fast particle specific pressure to the double-tearing mode to explore the physical mechanism of its impact. Keywords Fast particles . Specific pressure . Reversed shear . Double-tearing mode
1 Introduction In the current Tokamak device, because there are a lot of fast particles in the heating process and fusion reaction products, the physics of fast particles has always been a very important topic in the future advanced Tokamak device, which has been widely studied. In the Tokamak device represented by TFTR, it is found that the off-axis neutral beam injection can form the antimagnetic shear configuration [1], which naturally controls the MHD instability of the Tokamak core due to its special configuration [2]. Through the hollow current distribution, the safety factor of the plasma in the center of the whole Tokamak is improved, so that the sawtooth mode can be avoided effectively. However, due to the existence of the reverse magnetic shear configuration, there will be many for rational surfaces with the same value, and the tearing modes generated on these rational surfaces may be coupled or even driven to produce double-tearing mode (DTM) [3]. In addition, in the non-linear evolution of double-tearing modes observed in this configuration, there will still be off-axis “sawtooth collapse” effect in the later
* ZW Wan [email protected] 1
College of Physics, Sichuan University, Chengdu 610065, China
stage of evolution, and the fast particles in the device will also excite certain instability [4]. The physical problems between the fast particles and the double-tearing modes are also concerned. Therefore, in the study of the physical problems related to ITER, the instability in the operation mode of antimagnetic shear is also very important. In addition, in the study of the instability of Tokamak device, the total method includes two aspects: theory and experiment, and the method to solve the contradiction between the theoretical calculation without analytical results and the higher and higher experimental cost is numerical simulation. In this paper, the simulation of plasma adopts the initial value simulation of hybrid dynamics and magnetic fluid, in which the simulation of fast particles is adopted
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