Performance Characteristics of the Ferilab 15-Foot Bubble Chamber with a 1/3-Scale Internal Picket Fence (IPF) And a Two-Plane External Muon Identifier (EMI)

摘要

The Fermilab 15-foot bubble chamber has been exposed to a quadrupole triplet neutrino beam. During this exposure, a 2-plane EMI and a 1/3-scale IPF, were in operation down-stream of the bubble chamber. The IPF consisted of sixteen 0.1 m exp 2 drift chambers (pickets) placed inside the vacuum tank of the bubble chamber to record temporal information from neutrino interactions. When a greater than or equal to 5-fold time coincidence between one or more of the pickets of the IPF and the EMI was formed, one was able to search the nagmetic tapes for dimuon candidates. Even with 1/3 geometrical coverage by the IPF, this system identified 70% of the dimuon candidates before the film was scanned. Other performance characteristics of the system will be presented with emphasis on the usefulness of the IPF. (ERA citation 04:014377)