Synchrocyclotron beam orbit and RF drive synchrocyclotron

Abstract

The invention specifies the use of feedback in the radio frequency (RF) drive for a synchrocyclotron, controlling the phase and / or amplitude of the accelerating field as a means to assure optimal acceleration of the beam, to increase the average beam current and to alter the beam orbit in order to allow appropriate extraction as the beam energy is varied. The effect of space charge is reduced by rapid acceleration and extraction of the beam, and the repetition rate of the pulses can be increased. Several means are presented to monitor the phase of the beam in synchrocyclotrons and to adjust the phase and amplitude of the RF to optimize the acceleration of the beam and to adjust the extraction and injection of the beam. Also, the use of a pulsed ion source that matches the acceptance window of the synchrocyclotron is described.

Description

[0001] This application claims priority to U.S. Provisional Application Serial No. 61 / 676,377, filed July 27, 2012, and U.S. Patent Application Serial No. 13 / 949,459, filed July 24, 2013, the disclosures of which are incorporated herein by reference Its entirety is incorporated here. Background technique [0002] Ion acceleration using a synchrocyclotron is a well-established technology that is well suited for producing high energies but relatively low average ion beam currents. Acceleration is achieved by applying a high frequency (usually radio frequency (RF)) electric field to the ion beam packet as it spirals outward from the center of an axisymmetric static magnetic field. It is well known that the frequency of the RF drive in a synchrocyclotron needs to be adjusted as the ion beam is accelerated. The RF drive can be extended to include a variable frequency RF generator, one or more RF power amplifiers, and one or more structures inside the magnetic field (such as an RF ...

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