Temperature stabilization of a K110 variable energy cyclotron magnet

Area of Science:

• Nuclear physics
• Accelerator technology
• Magnetics

Background:

• Large-scale cyclotrons require highly stable magnetic fields for operation.
• Achieving magnetic field stability is challenging due to gradual magnet temperature changes caused by heat transfer from normal conducting coils.
• Conventional methods require over 10 hours to stabilize magnetic fields in cyclotrons.

Purpose of the Study:

• To develop a method for stabilizing magnet temperature in the TIARA K110 cyclotron.
• To suppress heat transfer from the main coil to the magnet.
• To achieve a highly stable magnetic field with reduced stabilization time.

Main Methods:

• Insertion of water-cooled copper plates between the main coil and magnetic yoke to suppress heat transfer.
• Development of a technique to control cooling water temperature based on the main coil current.
• Monitoring magnet temperature and magnetic field stability.

Main Results:

• Magnet temperature was successfully stabilized to 24 ± 0.3 °C for various ion beams.
• The magnetic field was maintained at ΔB/B = 1 × 10^-5 after a few hours of operation.
• Significant reduction in magnetic field stabilization time compared to conventional methods.

Conclusions:

• The implemented technique effectively stabilizes magnet temperature in the TIARA K110 cyclotron.
• This method ensures a highly stable magnetic field, crucial for precise cyclotron operation.
• The approach offers a practical solution for improving the performance and efficiency of large-scale cyclotrons.