Part I: Angular distribution measurement of beam-foil muonium. Part II. Muon injection simulation for a new muon g-2 experiment

Thesis/Dissertation · Wed Jan 01 04:00:00 EST 1992

OSTI ID:6923298

Ahn, H E

The angular and energy distributions of positive muons ([mu][sup +]) and muonium (M) produced by the beam-foil [Bol81] method have been measured. A low pressure multi-wire proportional chamber (MWPC) upstream of the target foil was used as a moderator and muon counter. To observe muonium, muons were swept away by a bending magnet which was placed downstream of the target foil. Two pairs of scintillators mounted above (S[sub t]) and below (S[sub b]) a microchannel plate detector (MCP) were used to detect the decay positrons to verify from the lifetime spectrum that the particles detected by the MCP are muons. The intensities of [mu][sup +] and M emerging from the Al foil at different angles were obtained from a time-of-flight spectrum (between MWPC and MCP) and a lifetime spectrum (between MCP and (S[sub t] or S[sub b])). The M neutral fraction [Phi][sub 0] has a very good agreement with the published data of hydrogen [Phi55] and deuterium [Ber72]. The charge exchange process depends only on the energy of emerging muons and not on the angular direction of the muons coming out of the foil. In a proposed muon g - 2 experiment [Hug88], pions are injected into a storage ring. The pions decay in flight into muons, which are trapped in the storage ring. Only about 10[sup [minus]4] of the pions injected into the storage ring produce stored muons. The alternative of muon injection into the ring with capture achieved by a fast kicker magnetic field has been studied. A simulation code has been written to model the muon injection process which computes the number of stored muons and other properties of the stored distribution, given the parameters of the storage ring and the inflected beam. The stored muon distribution is insensitive to fluctuations in storage ring parameters or injected beam parameters. A long electric kicker with small field works about as well as short electric kicker with high field.

• Research Organization: Yale Univ., New Haven, CT (United States)
• OSTI ID: 6923298
• Country of Publication: United States
• Language: English

Related Subjects

662350 -- Decays of Mesons-- (1992-)
664500* -- Special Atoms & Molecules-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR DISTRIBUTION
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BEAM INJECTION
DISTRIBUTION
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
ELEMENTARY PARTICLES
ENERGY SPECTRA
EQUIPMENT
FERMIONS
ION SPECTROSCOPY
KICKER MAGNETS
LEPTONS
MAGNETS
MATTER
MUONIUM
MUONS
MUONS PLUS
SPECTRA
SPECTROSCOPY