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A new 40 m long electrostatic beamline has replaced the original 50-year-old injection line at the 500 MeV cyclotron.
A novel suppression scheme for the cyclotron stray magnetic field has been implemented using a continuous, in-vacuum µ-metal shield. Beam bunching is performed with a new three-harmonic buncher, whose amplitude has been calibrated through beam-based techniques. Advanced powerful beam instrumentation has been introduced for beam intensity, profile and position monitoring including non-interceptive devices.
The injection system operates under ultra-high vacuum (low 10⁻⁸ Torr), achieved using stainless steel and ceramics materials and all-metal seals.
During commissioning, new high-level software applications for online tuning were deployed. These tools are now integrated into routine operation, providing enhanced automation and reproducibility of tuning procedures.
The paper also discusses the initial teething problems associated with diagnostic devices crosstalk, ion gauges interference with beam, high voltage discharges of electrostatic devices.
Overall, the new injection beamline significantly improves the robustness, flexibility, and performance of cyclotron operations.
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