Speaker
Description
To measure spin precession in ultra-precise magnetic fields, we are developing a beam injection technique based on a three-dimensional spiral trajectory. As a representative case, the transverse phase-space requirements for injecting a 300 MeV/c muon beam into a solenoid-type storage magnet (central field: 3 T, local field uniformity controlled below 0.1 ppm using medical-MRI technology) were previously reported at IPAC25/WEPM029.
In this presentation, we introduce a beam phase-space design concept using a quadrupole magnet that can be rotated by an arbitrary angle around the beam (Z) axis, and we show an example transport line that successfully achieves the required X–Y coupling. We further discuss a beam-diagnostics scheme employing the rotating quadrupole to determine a full 4×4 σ-matrix.
Promising operational results on the control of X–Y coupled beams—obtained from the demonstration experiments conducted between 2014 and 2024—will also be presented, indicating that the approach is moving in the expected and desirable direction.
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