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Axial centering method of superconducting coil in compact cyclotron

A technology for cyclotrons and superconducting coils, which is applied to superconducting magnets/coils, magnetic resonance accelerators, magnetic objects, etc., can solve problems such as large beam current losses, and achieve simple implementation, high difficulty in implementation, and high alignment accuracy

Active Publication Date: 2020-02-21
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention proposes an axial centering method for superconducting coils in a compact cyclotron, with the purpose of solving the problem that the beam current in a compact cyclotron deviates from the central plane of the accelerator and causes a large beam loss

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  • Axial centering method of superconducting coil in compact cyclotron
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  • Axial centering method of superconducting coil in compact cyclotron

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Embodiment

[0072] A 230MeV compact superconducting cyclotron, the magnetic pole radius is 85cm, the superconducting coil current runs at 250A, the average magnetic field range of the center plane of the accelerator is 2.3-3.0T, and the magnet is in a polar saturation state. A radial target is installed in the accelerator, which can measure the beam current intensity and beam axial distribution from the small radius of 10cm to the extraction radius position. In the magnetic field measurement stage, measure the magnetic field distribution at 250A and 260A, and adjust the beam current to be near the center plane through the axial centering of the coil. The steps are as follows:

[0073] (1) Calculate the beam dynamics from the magnetic field measured at 250A, and obtain the axial one-cycle oscillation number V z Variation curve with radius.

[0074] (2) Calculate the average magnetic field from the magnetic field measured at 250A and 260A, see image 3 As shown in curves 1 and 2, the magn...

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Abstract

The invention discloses an axial centering method for a superconducting coil in a compact cyclotron. The axial centering method comprises the following steps: measuring axial magnetic field distribution Bc of the superconducting coil in a central plane of the cyclotron; and adjusting axial offset position delta Z of the superconducting coil to realize axial centering. The method overcomes the traditional prejudice that when the axial non-centering problem of the superconducting coil in the compact cyclotron is solved in the prior art, the axial position of the superconducting magnet is generally adjusted in a radial magnetic field measurement mode; and the prejudice leads to high engineering implementation difficulty and difficulty in ensuring the measurement precision. According to the invention, only the axial magnetic field distribution provided by the superconducting coil on the central plane of the accelerator is measured, the axial offset position of the superconducting coil is adjusted in cooperation with the beam debugging stage, and the axial centering of the superconducting coil can be realized through multiple iterations; and the method is simple to implement, and high in centering precision.

Description

technical field [0001] The invention belongs to the technical field of compact superconducting cyclotrons, in particular to an axial centering method of superconducting coils in compact cyclotrons. Background technique [0002] In a cyclotron, the magnetic field consists of two parts: one provided by the coil itself, and one produced by magnetization of the magnet. If it is a normal temperature magnet (non-superconducting magnet), because its magnetic field is relatively weak, and because the magnetic field contributed by the coil in the normal temperature magnet is very small, it does not matter even if the coil is a little asymmetrical up and down, because the magnetic field of the normal temperature magnet is mainly contributed by the magnet, so The room temperature accelerator only needs the magnets to be symmetrical up and down. [0003] Superconducting magnets are different from normal temperature magnets. The magnetic field provided by superconducting coils in superc...

Claims

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Application Information

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IPC IPC(8): H05H7/04H05H13/00H01F6/06
CPCH01F6/06H05H7/04H05H13/005
Inventor 李明张天爵王川
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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