A RECOIL DETECTOR FOR THE INTERNAL TARGET FACILITY OF AMPS (NIKHEF)

A recoil detector has been built for internal target experiments with the Amsterdam Pulse Stretcher and storage ring, AmPS, of NIKHEF. The d etector was designed to detect low-energy (1-20 MeV/nucleon) and low-m ass (A less than or equal to 4) recoiling nuclei emerging from electro n-induced reactions. The detector consists of a low-pressure, two-step avalanche chamber, two layers of silicon strip detectors of 100 and 4 75 mu m thickness and a scintillator. The signals from the separate de tector elements are processed by custom-made analog electronics and de dicated VME-based digitizer modules. The detector was operated success fully at the AmPS electron scattering facility with a gaseous He targe t of 10(15) atoms/cm(2) internal to the storage ring and beam currents up to 200 mA of 660 MeV electrons. Unambiguous particle separation wa s achieved. (C) 1998 Elsevier Science B.V. All rights reserved.