Design And Construction Of A Magnetic Probe Diagnostic System For The θ-pinch Formation Zone Of A FRC Plasma

Field reversed configuration(FRC)is of great significance for the development of new fusion configuration research,miniaturization and economic exploration of fusion reactors.To observe the motion state of the plasma,a variety of diagnostics are needed to detect its physical state.Among them,the magnetic diagnostic system is one of the most basic diagnostic systems for plasma devices.Since the magnetic field is closely related to the plasma,the magnetic field information can reflect or deduce the plasma parameters and its motion characteristics from the side.In this paper,a set of magnetic diagnosis system covering the formation area is designed.Its purpose is to use the inverse magnetic properties of FRC plasma to obtain the plasma interface radius,and to obtain plasma position information through the interventional magnetic probe array and the magnetic flux ring array.And stability information.The interventional probe requires accurate measurement of the magnetic field signal while being small in size.This article uses a multilayer printed circuit board as the framework to design an interventional magnetic probe suitable for field-reversal magnetic field diagnosis,which increases the volume of the interventional probe.Utilization rate;in view of the particularity of the environment where the interventional probe is located,corresponding sealing and insulation protection are designed for the interventional probe;according to the frequency range of the background magnetic field of the discharge coil,the high-frequency response characteristics of the magnetic probe are tested,and Calibrated;in order to make the interventional magnetic probe movable in the radial direction,a corresponding drive system was made in this article;In this paper,a magnetic flux loop suitable for high-frequency and high-voltage magnetic flux measurement is designed,and a special capacitor divider magnetic flux loop and integrating circuit are used for the magnetic flux loop;the signal is calibrated by simulating the discharge of the discharge circuit,Corrected the signal distortion caused by the stray parameters of the circuit under high-frequency conditions;in the field anti-plasma magnetic trap type magnetic compression fusion device pre-research platform(called Hust Field-Reversed Configuration,HFRC),tested the high-frequency high-voltage Under the experimental conditions,the accuracy of the magnetic field data collected by the magnetic flux loop and the point magnetic probe.