muCool: A novel low-energy muon beam for future precision experiments

Abstract

Experiments with muons (${\mu }^{+}$) and muonium atoms (${\mu }^{+}{e}^{-}$) offer several promising possibilities for testing fundamental symmetries. Examples of such experiments include search for muon electric dipole moment, measurement of muon $g-2$ and experiments with muonium from laser spectroscopy to gravity experiments. These experiments require high quality muon beams with small transverse size and high intensity at low energy. At the Paul Scherrer Institute, Switzerland, we are developing a novel device that reduces the phase space of a standard ${\mu }^{+}$ beam by a factor of $10^{10}$ with $10^{-3}$ efficiency. The phase space compression is achieved by stopping a standard ${\mu }^{+}$ beam in a cryogenic helium gas. The stopped ${\mu }^{+}$ are manipulated into a small spot with complex electric and magnetic fields in combination with gas density gradients. From here, the muons are extracted into the vacuum and into a field-free region. Various aspects of this compression scheme have been demonstrated. In this article the current status will be reported.

arXiv comment8 pages, 5 figures, TCP 2018 conference proceedings

References in corpus (8)

• Measurement of the Negative Muon Anomalous Magnetic Moment to 0.7 ppm
• An Improved Limit on the Muon Electric Dipole Moment
• Muon spin rotation and relaxation in magnetic materials
• A limit for the mu -> e gamma decay from the MEG experiment
• The Mu-MASS (MuoniuM lAser SpectroScopy) experiment
• Muon cooling: longitudinal compression
• Studying Antimatter Gravity with Muonium
• Testing antimatter gravity with muonium

Cited by in corpus (2)

• Intense beam of metastable Muonium
• A proposed PKU-Muon experiment for muon tomography and dark matter search