Oct 16 – 20, 2016
Europe/Zurich timezone

Low emittance muon source for muon g-2/EDM at J-PARC

Oct 19, 2016, 3:50 PM
Oral Low energy precision tests of the Standard Model We - 3


Dr Glen Marshall (TRIUMF)


The anomalous magnetic moment of the muon, a_mu = (g_mu - 2)/2, has been measured to 0.54 ppm at BNL (E821), and when compared to the Standard Model (SM) calculation of similar precision, a discrepancy of about 3 sigma remains unexplained. A similar method will be used at FNAL (E989) with the goal of achieving a factor of four increase in experimental precision. An independent method is being exploited for the J-PARC muon g-2/EDM experiment (E34). It uses a smaller high-precision storage ring for 300 MeV/c muons with no requirement for electric field focusing. Storage is achieved due to the extremely small momentum spread of the beam, maintained through acceleration of room-temperature thermal muons. The method offers many advantages, and relies on a thermal muon source derived from laser ionization of muonium atoms emitted from silica aerogel structures. The yields and properties of the muonium in vacuum are being studied at TRIUMF as well as at RIKEN/RAL and J-PARC. The status of the muonium experiments will be presented, showing the substantial increase in thermal muonium yield from laser-ablated aerogel materials and the current understanding based on model-independent analysis as well as comparison with simulations based on muonium diffusion.

Primary author

Dr Glen Marshall (TRIUMF)

Presentation materials