SET-UP OPTIMIZATION FOR ARM EXPERIMENTAL TEST OF A POSITRON SOURCE USING CHANNELING

A new experiment is suggested in order to investigate the positron yie ld at the exit of crystal tungsten targets of different thicknesses su bmitted to 10 GeV electron beam at one of the SPS CERN transfer lines. The Set-up consists of the beam control counters, targets mounted on the goniometer, positron detector and photon detector. The positron de tector is based mainly on a drift chamber inserted between the poles o f the magnet. It allows to reconstruct the track of the charged partic les, to define the vertex coordinates and initial angle of the particl es at the exit of the target, to measure the total and transverse mome nta. A Monte Carlo simulation corresponding to the theoretical descrip tion of chanelling radiation and also numerical calculation were provi ded for the estimations of the expected distributions and detector res ponse. The optimization of the Set-up is considered, as well as the st atus of the project in general. (C) 1998 Elsevier Science B.V. Al righ ts reserved.