A Periodic Magnet Assembly That Generates Torsion Orbits and Increases Axial Focusing Force

Abstract

The invention discloses a periodic magnet assembly generating a torsional pendulum track and increasing axial focusing force; the periodic high-gradient magnet assemblies used for generating torsionalpendulum track and increasing axial focusing force are arranged at intervals in the circumferential direction of an accelerator; the periodic high-gradient magnet assembly used for generating torsional pendulum track and increasing axial focusing force is characterized by comprising a reverse deflection magnet arranged in the middle of two forward deflection magnets, wherein the reverse deflection magnet is a magnet which is opposite to the magnetic pole direction of the forward deflection magnets in the vertical direction; and the reverse deflection magnet is a magnet capable of performing axial focusing for focusing the particles at the upper and lower ends close to the current track of the accelerator to the current track. According to the periodic magnet assembly, the reverse deflection axial focusing magnet is introduced, and radial variable gradient and variable helix angle and the like are adopted, so that the alternating focusing force is generated, and the axial focusing intensity is improved, and therefore the beam flow can be stably accelerated to 1GeV or above, and the energy limitation of the lead-out beam flow of a traditional cyclotron is broken through.

Description

technical field [0001] The invention belongs to the technical field of accelerators, and in particular relates to a magnet assembly for generating twisted orbits with periodic high gradients for increasing axial focusing force. Background technique [0002] The trajectory of particles is a straight line in the absence of a magnetic field, and the trajectory of particles in a cyclotron changes from linear motion to circular motion after the trajectory is deflected under the action of a magnetic field. We call the orbits of ideal particles ideal orbits. The non-ideal particles in the cluster oscillate up and down near the ideal orbit. If these non-ideal particles cannot be effectively restrained, the beam loss will be caused, that is, the accelerator beam current is strongly affected. limit. [0003] In the prior art isochronous cyclotron design, the axial component of the magnetic field of the magnet is the effect of axial defocusing on the beam. Axial defocusing means that ...

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Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention proposes a periodic magnet assembly that generates twisted orbits and increases the axial focusing force, with the purpose of solving the problem of insufficient axial focusing force in the cyclotron design of the prior art

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