Speaker
Description
To measure spin precession in ultra-precise magnetic fields, a method for injecting a beam with a three-dimensional spiral trajectory has been developed. For example, a muon beam with a momentum of 300 MeV/c must be confined within a controlled storage region (radius 33.3 ± 1.5 cm, height ± 5 cm) in a solenoid-type storage magnet (central magnetic flux density 3 T) based on medical MRI technology, with the local magnetic field variation controlled to be less than 0.1 ppm. A vertical kick by magnetic field is required to suppress the motion in the axial direction of the solenoid, and trial calculations have shown that a pulsed magnetic field can be excited by applying a pulsed current with a half-sine waveform (peak current 1 kA, pulse width 120 ns, frequency 25 Hz) to a kicker coil with a radius of 37 cm and a height of 10 cm. Generating a magnetic field using an extremely fast pulsed current requires a calculation method that takes into account the transient response on the conductor surface, with a skin effect of approximately 35 μm. In this presentation, we will apply the OPERA model to the geometry of the current kicker field generating conductor, and discuss the modeling by practicable mesh on the conductor surface and the evaluation of the time-space distribution of the generated kicker field. In addition, we will also discuss the model calculation method including the wall of the vacuum chamber around the kicker device.
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