Performance of a compact detector package for the out-of-plane spectrometer system

Abstract

We report on the design and performance of compact detector packages currently installed in the four magnetic out-of-plane spectrometers for electron scattering experiments at the MIT-Bates Linear Accelerator Center. The detector packages have been designed to meet the mechanical requirements arising from out-of-plane particle detection. They offer good trajectory and momentum reconstruction, particle identification and time-of-flight measurements for electrons, pions, protons, and deuterons with large momentum bites and in broad kinematical ranges and high luminosities. The detectors have so far been used with great success in out-of-plane measurements of 12 C( e → , e′ p) , 2 H( e → , e′ p) , virtual Compton scattering below pion threshold and in studies of the N→ Δ transition in both exclusive reaction channels 1 H( e → , e′ p) π 0 and 1 H( e → , e′ π +)n .