Calibration method for area calibration of induction coil probes
An induction coil and area technology, which is applied in the field of quantum accelerator magnetic field measurement, can solve the problems of increasing costs and achieve the effects of low requirements for precise positioning, simple structure, and reduced calibration costs
Active Publication Date: 2020-05-19
CHINA INSTITUTE OF ATOMIC ENERGY
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The former also needs to design a zero-flux chamber with high shielding efficiency, which increases the corresponding cost
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[0029] The specific preferred embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.
[0030] Such as figure 1 As shown, a high-precision induction coil probe area calibration device includes diodes 1 and 2, induction coil probe 4, nuclear magnetic resonance probe 5, Tesla meter 7, integrator 8, computer 9 and probe fixing fixture 3 composition. The clamp 3 is slotted at both ends, the circular slot on the left is equipped with the induction coil probe 4, and a small slot is reserved for the induction coil probe to lead the cable routing; the square slot on the right is equipped with the nuclear magnetic resonance probe 5, and the clamp is installed on the second pole In the air gap formed by the iron left magnetic pole 1 and the right magnetic pole 2; the induction coil probe 4 is connected with the integrator 8, the nuclear magnetic resonance probe 5 is connected with the Tesla meter 7, and both are connecte...
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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 specifically relates to a device and a calibration method for calibrating the area 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. 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, the cutting magnetic field generates electromotive force, and the integration of the electromotive force over time can be obtained by measuring the integration of the electromotive force with the integrator to obtain the magnetic flux change ΔФ. The area S of the probe coil is known. Obtain the magnetic field d...
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IPC IPC(8): G01R35/00
CPCG01R35/005
Inventor 李明张天爵杨光曹磊吕银龙关镭镭王飞
Owner CHINA INSTITUTE OF ATOMIC ENERGY