Calibration device for area of induction coil probe and calibration method

Abstract

A device comprises a clamp and an integrator. Grooves are respectively formed in the two opposite ends of the clamp in the shape of a positive cylinder, one of the grooves is used for assembling a to-be-calibrated induction coil probe, and the other groove is used for assembling a nuclear magnetic resonance probe; the nuclear magnetic resonance probe is connected with a teslameter; the integratoris communicated with the to-be-calibrated induction coil probe. The calibration method includes the steps of fastening the assembled clamp to the center of a magnetic pole air gap of a two-pole magnet; adjusting the excitation current of the two-pole magnet to I to enable the magnetic field strength in the air gap of the two-pole magnet to reach a stable value B0 which is greater than 1.0T; starting integration, or starting to adjust the excitation current from I to -I within larger than or equal to 30 seconds, wherein the magnetic field strength reaches a stable value B1, and delta phi is acquired through integration; calculating the area of the probe, S is equal to delta phi / (B1-B0); repeating the steps; calibrating the area as an arithmetic mean value of the multi-measured areas S. Thedevice has the advantages that the area calibration method has lower requirements of precise positioning, and the area calibration accuracy can reach 5*10<-5>.

Description

technical field [0001] The invention belongs to the field of quantum accelerator magnetic field measurement, and in particular relates to a device and a calibration method for area calibration of an induction coil probe. Background technique [0002] The magnetic flux method is a commonly used magnetic field measurement method in accelerators, especially in superconducting cyclotrons, where the magnetic field strength is greater than 2T, and the required measurement accuracy is higher than 10 -4 , the magnetic flux method is the best choice. The basic principle of the magnetic flux method is that the induction coil probe moves from the center to any position in the cyclotron, cutting the magnetic field to generate electromotive force, and the change of magnetic flux Δφ can be obtained by measuring the integration of the electromotive force with time through the integrator. The area S of the probe coil is known, and can be The magnetic field difference between two points is ...

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Problems solved by technology

[0005] The former also needs to design a zero-flux chamber with high shielding efficiency, which increases the corresponding cost

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