Core column structure for improving magnetic focusing force at central area of superconducting cyclotron

Abstract

The invention relates to a core column structure for improving a magnetic focusing force at a central area of a superconducting cyclotron. The core column structure comprises a core column body (4). The core column body (4) is divided into an upper part and a lower part. The lower part has a cylindrical structure. The upper part has a structure in which a plurality of magnetic pole valley areas (5) and a plurality of magnetic pole peak areas (1) are arranged alternatively. The magnet ring of the azimuth of each magnetic pole valley area (5) is step-shaped. Two side edges on the head surface of each magnetic pole peak area (1) are provided with chamfered corners (6). The core column structure for improving a magnetic focusing force at the central area of the superconducting cyclotron has advantages of improving the axial magnetic focusing force at the central area of the superconducting cyclotron, reducing particle acceleration high-frequency phase slippage at the central area, effectively reducing beam loss at the central area, improving acceptance degree of the beam at the central area, and improving strength of the beam which is introduced from an accelerator. The core column structure further has advantages of simple structure and high practicability.

Description

technical field [0001] The invention belongs to the field of cyclotrons, and in particular relates to a core column structure for enhancing the magnetic focusing force in the central area of ​​a superconducting cyclotron. Background technique [0002] In a classical cyclotron, in order to compensate for the increase in particle mass brought about by relativistic effects, the average magnetic field needs to increase gradually with the radius. But this causes a defocusing of the magnetic field in the axial direction. In the isochronous cyclotron, the magnetic field modulated along the azimuthal angle is introduced by the alternating peak-valley pole structure, thereby introducing additional axial focusing force. A superconducting cyclotron is an isochronous cyclotron using a superconducting excitation coil. In the central area of ​​the superconducting cyclotron, due to the high saturation of the magnetic field, the modulation degree of the magnetic field along the azimuth an...

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Problems solved by technology

If the radial width of the small convex hull is too large, it may even cause the particles to fall into the deceleration phase and not get continuous acceleration

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