Measurement and control method of high-precision magnetic field of multi-threaded double-probe superconducting cyclotron
A cyclotron, measurement and control technology, applied in the direction of the magnitude/direction of the magnetic field, measuring devices, measuring magnetic variables, etc., can solve the problems of high professional requirements for machinery and control, system errors, etc., to reduce the magnetic field measurement time and improve The effect of reliability, guaranteed precision and accuracy
Active Publication Date: 2020-07-28
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology
At present, the international superconducting cyclotron mainly adopts the magnetic flux method to measure the magnetic field. Due to the need to introduce a variety of equipment such as induction coil probes and integrators, the professional requirements for machinery and control are relatively high, and system errors are easily introduced. This problem needs to be investigated. solve
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Embodiment 1
[0029] A 230MeV superconducting cyclotron, the peak and valley areas of the main magnetic field are 4.0T and 1.5T respectively, and the starting radius of the radial magnetic field measurement of the accelerator is R S = -16cm, end point radius is R E =85cm, the above position is relative to the center of the accelerator. Fix a certain angle and measure the radial magnetic field with a measurement interval of ∆R=1cm. Measurement steps such as figure 2 As shown, the details are as follows:
[0030] 1) Move the induction coil probe to the -17cm position;
[0031] 2) Keep the probe still, configure the integrator as time-triggered mode, the integration time is 5s, start the integration, obtain the magnetic flux Φ=0.000112Wb, and calculate the linear drift L of the integrator off =Φ / (S*T) =0.933Gs / s, S=0.24m 2 ;
[0032] 3) Configure the integrator again as the encoder trigger mode, and set the radius of the starting point of integration as R S , the end radius is R E , t...
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The invention discloses a measurement control method for a high-precision magnetic field of a multi-thread double-probe superconducting cyclotron. Adopted equipment comprises an induction coil probe,a linear grating ruler, a signal multiplexer, a motion controller, an integrator and a computer, wherein the induction coil probe and a grating ruler reading head move forwards along the radial direction of the cyclotron; the grating ruler outputs square waves, and the square waves are modulated into the same square wave A signal and B signal through the signal multiplexer; the square wave A signal and B signal are transmitted to the integrator and the motion controller respectively; radial accurate positioning during measurement of two groups of probes is realized simultaneously through the computer; synchronous parallel measurement of double probes in a flight mode is realized by adopting a multi-thread technology; the magnetic field measurement time is greatly shortened; and the precision and accuracy of magnetic field measurement data of the superconducting cyclotron are ensured, so that the overall reliability of the cyclotron is improved.
Description
technical field [0001] The invention belongs to the field of cyclotron magnetic field measurement, and in particular relates to a method for measuring and controlling the high-precision magnetic field of a multi-thread double-probe superconducting cyclotron. Background technique [0002] A superconducting cyclotron is used to accelerate and extract a stable beam, and the beam movement needs to be confined by an isochronous magnetic field. In order to provide an isochronous magnetic field, it is necessary to measure the magnetic field of the accelerator. The magnetic field is shimmed according to the measured data, so that the magnetic field meets the beam dynamics requirements. [0003] The Hall effect method and the magnetic flux method are two commonly used magnetic field measurement methods in accelerators. The former is mainly suitable for measuring within 2T and the accuracy is not higher than 10 -4 There are relatively mature Hall probe products on the market; the la...
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IPC IPC(8): G01R33/07G01R33/02
CPCG01R33/02G01R33/07
Inventor 曹磊李明张天爵吕银龙
Owner CHINA INSTITUTE OF ATOMIC ENERGY