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Description
A superconducting cyclotron, the CYCIAE230, has been developed by CIAE of CNNC for proton therapy applications over the past few years. The beam commissioning of this machine was completed previously, in 2023. A series of improvements were carried out in the early part of this year to increase the stability and beam intensity of the cyclotron for potential FLASH usage. It includes optimizing the ion source to achieve higher intensity, optimizing the phase selection in the central region, and aligning the primary coil, as well as adjusting the location of the electrostatic deflector, among other factors. In the meantime, several measures have also been taken to improve cyclotron subsystem stability, including enhancements to the RF system and improvements in beam diagnostics, such as the time structure and beam phase. A dedicated beam tuning software has been developed to adapt to the needs of cyclotron beam fine-tuning. It provides a feature that displays all parameters on a single page, which facilitates beam tuning activity. All these technical adjustments combined led to an overall extraction beam current of up to 1.6 μA. Afterward, the radiation distribution analysis and relocation of the cyclotron accessory device were performed according to the configuration of the short-term runs. The optimization measures, improvements to the subsystems, and beam tuning results will be reported in this paper, along with the dedicated beam tuning software.
