Demonstration of Muon-Beam Transverse Phase-Space Compression

Abstract

We demonstrate efficient transverse compression of a 12.5 MeV/c muon beam stopped in a helium gas target featuring a vertical density gradient and crossed electric and magnetic fields. The muon stop distribution extending vertically over 14 mm was reduced to a 0.25 mm size (RMS) within 3.5 $\mu$s. The simulation including cross sections for low-energy ${\mu }^{+}$-$\text{He}$ elastic and charge exchange (${\mu }^{+}\leftrightarrow$ muonium) collisions describes the measurements well. By combining the transverse compression stage with a previously demonstrated longitudinal compression stage, we can improve the phase space density of a ${\mu }^{+}$ beam by a factor of $10^{10}$ with $10^{-3}$ efficiency.

arXiv comment6 pages, 7 figures; accepted for publication in Phys. Rev. Lett

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• The MEG detector for $\mu +\to e+\gamma$ decay search
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• Scintillation detectors with silicon photomultiplier readout in a dilution refrigerator at temperatures down to 0.2 K
• Acceleration of positive muons by a radio-frequency cavity
• Performance of the MICE diagnostic system
• Phase space compression of a positive muon beam in two spatial dimensions