We're concerned with future accelerators of high intensity protons for isotope production. To this end, we initiate a proposal to design an innovative superconducting H+ 3 cyclotron TR150, aiming at proton energy of 70–150 MeV and proton current of ∼ 1.0 mA. Cyclotrons in this energy range are not developed world-wide; moreover numerous highly interesting and increasingly demanded radionuclides are in this energy range. Our machine shall be designed to accelerate H+ 3 ion, the simplest and stable triatomic molecular ion, by injection from an external ion source and extraction by stripping. This has potential to extract proton beam of variable energies with very high extraction efficiency, and thus enables to simultaneously provide multiple proton beams for multiple external production targets. A baseline design of our machine and the beam dynamics studies are presented in this paper.
An accurate and detailed field map is important for cyclotron beam dynamics studies. During the long history of cyclotron studies, many techniques have been developed by cyclotron pioneers for the treatment of median plane field map. In this paper, we take the TRIUMF 500 MeV cyclotron as an example to study the asymmetric field resulting from imperfect median plane symmetry. The “Gordon approach” and a highly accurate compact finite differentiation method are used to investigate the historical field survey data. The redundancy in the survey data is revealed by the expansion method, which also makes it possible to correct the error in the measurement. Finally, both the azimuthal field Bθ and the axial gradient of the axial field dBz /dz in the median plane are corrected using the radial field map Br . The influence of the correction is examined by recalculating the equilibrium orbit properties of the TRIUMF cyclotron. The result shows significantly increased vertical centering errors of the closed orbits. A further simulation study suggests that these centering errors can be reduced to below 1.5 cm by adjusting the trim coils' Br field within the output limits of our trim coils' power supplies. The error in the measurement field data may explain why the calculated trim coils' settings during the cyclotron commissioning in 1974 encountered difficulty.
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