A threshold gas Cherenkov detector for the Spin Asymmetries of the Nucleon Experiment

作者：Armstrong Whitney R^*; Choi Seonho; Kaczanowicz Ed; Lukhanin Alexander; Meziani Zein Eddine; Sawatzky Brad

来源：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment , 2015, 804: 118-126.

DOI：10.1016/j.nima.2015.09.050

• Threshold gas Cherenkov detector
• SANE
• Particle identification

We report on the design, construction, commissioning, and performance of a threshold gas Cherenkov counter in an open configuration, which operates in a high luminosity environment and produces a high photo-electron yield. Part of a unique open geometry detector package called the Big Electron Telescope Array (BETA), this Cherenkov counter served to identify scattered electrons and reject produced pions in an inclusive scattering experiment known as the Spin Asymmetries of the Nucleon Experiment (SANE), E07-003 at Jefferson Lab. The experiment consisted of a measurement of double spin asymmetries A(parallel to) and Lambda(perpendicular to) of a polarized electron beam impinging on a polarized ammonia target. The Cherenkov counter's performance is characterised by a yield of about 20 photoelectrons per electron or positron track. Thanks to this large number of photoelectrons per track, the Cherenkov counter had enough resolution to identify electron-positron pairs from the conversion of photons resulting mainly from pi(0) decays.

• 出版日期2015-12-21