Method for adjusting particle orbital centering by using first harmonics in cyclotron

Abstract

The invention discloses a method for adjusting particle orbital centering by using first harmonics in a cyclotron. The method comprises the following steps: eight coils that are symmetric up and downrelative to a midplane are used for generating a correction magnetic field; the positions and passing currents of all coils are arranged and set to guarantee generation of first harmonics with randomly adjustable amplitudes and phases; and according to an actual eccentricity value of a particle orbit, the amplitudes and directions of the passing currents of all coils are adjusted, so that centering of the particle orbital is optimized. The method is based on the simple and reliable principle; the external direct-current power supply of the accelerator is controlled to realize on-line adjustment during the debugging operation process of the accelerator by combining real-time feedback of beam detection of the accelerator; and the feasibility and operability are high. Compared with the traditional methods modifying the DEE plate shape or the location of an ion source, the method disclosed by the invention enables real-time adjustment to be realized during the debugging operation process of the accelerator, so that the adjustment flexibility is enhanced and the adjustment accuracy is improved.

Description

technical field [0001] The invention belongs to the technical field of cyclotrons, and in particular relates to a method for adjusting the centering of particle orbits, more specifically, a method for adjusting the centering of particle orbits in a cyclotron by using a first harmonic. Background technique [0002] In the design of the central area of ​​the accelerator, orbital alignment is a very important indicator. Because the equilibrium orbit of the particle is usually symmetrical about the center of the circle, if the acceleration orbit is not properly centered, the particle will deviate too far from the equilibrium orbit during the acceleration process, resulting in a greatly increased radial amplitude. Particles can even be lost if the radial amplitude is too large, beyond the radial acceptance of the corresponding equilibrium orbit. [0003] Usually, when designing the central area of ​​the accelerator, the particle alignment is optimized by adjusting the geometric ...

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Problems solved by technology

[0003] Usually in the design of the central area of ​​the accelerator, the particle alignment is optimized by adjusting the geometric shape of the DEE plate, changing the position of the ion source (in the case of the internal ion source), and adjusting the parameters of the deflection plate (in the case of the external ion source). The accuracy of the design of the area depends on the experience and level of the designer, and it cannot be adjusted in real time during the commissioning and operation process, and the adjustment means are not flexible enough

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