Abstract
An AC magnetic sensor is presented for measuring the high speed and high strength magnetic field generated in Z-pinch fusion machines. The proposed magnetic sensor provides the measurement of magnetic fields across a broadband frequency range. The simulation of magnetic probe is presented using a SPICE simulation software LTspice. The magnetic sensors are installed in a Pulsotron-3 Z-pinch machine and measured performance of the sensor are presented. This sensor also can be used to check the ignition conditions of the Z-Pinch by measuring the magnetic field generated by the output streams of large number of reacted alpha particles. The equations for measuring non-stationary magnetic field due to rapidly varying electric currents and a LTspice simulation file are provided to help the engineers to design, build, and install this kind of sensors.
Highlights
Magnetic field measurements are extensively used in the field of magnetically confined fusion [1,2,3]
These magnetic diagnostics [4] are required for understanding plasma behaviour
The changing magnetic field in the sensor induces an Electro Motive Force (EMF) which is integrated over time to determine the desired plasma property [7]
Summary
Magnetic field measurements are extensively used in the field of magnetically confined fusion [1,2,3]. The state-of-the-art magnetic sensors based on the Hall effect [8] measures magnetic fields up to 0.2 tesla across a 20 kHz bandwidth These sensors are completely out of range for Z-pinches that can reach more than 10 kilotesla and pulse width of 100-2000 nanoseconds. After several tests carried out using Pulsotron-2A and Pulsotron-3 it is recommended that it is necessary to install several magnetic sensors in an array that can measure several parameters of the discharging energy through a plasma in Z-pinches It is needed a small and accurate magnetic sensor to be immersed in plasma to measure its parameters as skin depth and plasma impedance that can be useful to study plasma properties and help make magnetic confinement fusion
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