Method for measuring magnetic field in FRC (field reversed configuration) plasmas

Abstract

The invention provides a method for measuring a magnetic field in FRC (field reversed configuration) plasmas, and the method comprises the steps: employing a laser ion beam locus probe (LITP) to measure the magnetic field in the FRC plasmas, and enabling an ion beam generated by a laser ion accelerator to enter a field inversion device through a collimator; measuring a circumferential deflection angle (phit-2 alpha0), axial displacement Z and flight time T of ions with different energies in a magnetic field in the FRC plasmas; and determining the annular deflection angle (phit-2 alpha0), the axial displacement Z and the quantitative relationship between the flight time T and the polar magnetic field profile of the magnetic field in the field inversion plasma, and nonlinearly reconstructingthe polar magnetic field profile. The method (LITP) provided by the invention can provide the error level of the LITP diagnosis magnetic field, the key parameters of the LITP prototype, the system framework and the like for the specific given FRC.

Description

technical field [0001] The present application relates to the field of magnetic confinement plasma research, in particular to the field of field-reversed configuration (FRC) plasma and plasma diagnosis technology, and more specifically to a magnetic field measurement method in field-reversed configuration plasma. Background technique [0002] In recent years, the field-reversed configuration (FRC) magnetic confinement plasma device research has progressed rapidly, and has become one of the magnetic confinement configurations seriously considered by the academic community. Domestic Xinao Energy Research Institute and other units are developing FRC devices, which are expected to make important breakthroughs in this direction. In the process of studying the equilibrium configuration, particle transport and confinement, and energy confinement of magnetically confined plasma, the magnetic field is an indispensable basic physical parameter. Therefore, magnetic field diagnosis is ...

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Problems solved by technology

However, in the FRC plasma, there are regions with opposite magnetic fields closely connected, which cause the laser Faraday effect to cancel itself on the propagation path and approach zero, while the motion Stark spectrum split caused by the weak magnetic field in the core is very small, and it is difficult to obtain an effective The magnetic field diagnostic results of

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