Author/Authors :
Hu، نويسنده , , J. and Sheffer، نويسنده , , G. and Davydov، نويسنده , , Yu.I. and Gill، نويسنده , , D.R. and Gumplinger، نويسنده , , P. and Henderson، نويسنده , , R.S. and Jamieson، نويسنده , , B. and Lindsay، نويسنده , , C. and Marshall، نويسنده , , G.M. and Olchanski، نويسنده , , K. and Olin، نويسنده , , A. and Openshaw، نويسنده , , R. and Selivanov، نويسنده , , V.، نويسنده ,
Abstract :
A low-mass time expansion chamber (TEC) has been developed to measure distributions of position and angle of the TRIUMF low-energy surface muon beam used for the TRIUMF Weak Interaction Symmetry Test (TWIST) experiment. The experiment is a high-precision measurement of muon decay and is dominated by systematic uncertainties, including the stability, reproducibility, and characterization of the beam. The distributions measured by two TEC modules are one essential ingredient of an accurate simulation of TWIST. The uncertainties, which are extracted through comparisons of data and simulation, must be known to assess potential systematic uncertainties of the TWIST results. The design criteria, construction, alignment, calibration, and operation of the TEC system are discussed, including experiences from initial beam studies. A brief description of the use of TEC data in the TWIST simulation is also included.
