Speaker
Description
The E34 experiment at J-PARC MLF aims to precisely measure the positive muon's anomalous magnetic moment and electric dipole moment.
Two technical challenges are critical. First, the ultraslow muon source (from muon cooling) must achieve its target intensity ($10^6 \mu^+/\text{sec}$) and low-emittance ($\epsilon_{x, \text{rms,normalized}}: \sim 0.3 \pi [\text{mm}\cdot\text{mrad}], \epsilon_{y, \text{rms,normalized}}: \sim 0.1 \pi [\text{mm}\cdot\text{mrad}]$). Second, the low-energy (5.7 keV) beam is highly sensitive to ambient magnetic fields and must be matched to the accelerator's acceptance with <10% accuracy, requiring active trajectory correction while preventing emittance growth.
To verify these conditions—muon source property and beam matching—we developed a new ultraslow muon beam diagnostic system.
In this system, the control section uses electrode pairs to actively correct the beam trajectory, which is sensitive to ambient fields. The transport section removes background particles (using an electrostatic mirror and bending magnet) and focuses the beam (using electrostatic quadrupoles). The measurement section uses the Q-scan method to measure the beam property.
Simulations were used to optimize the system for 100% transport efficiency and <10% emittance measurement accuracy. Subsequent commissioning confirmed the system is ready for the quality evaluation of the beam in the new experimental area.
This poster will discuss the simulation and commissioning results.
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