The HERMES Spectrometer
K. Ackerstaff, et al. (The HERMES Collaboration)

TL;DR
The HERMES spectrometer is a sophisticated detector system designed to study the spin structure of the nucleon through deep inelastic scattering experiments with polarized particles, featuring advanced tracking and particle identification capabilities.
Contribution
This paper introduces the design and features of the HERMES spectrometer, enabling precise measurements of polarized deep inelastic scattering.
Findings
High acceptance for positrons and hadrons
Effective particle identification including pions
Contributions to understanding nucleon spin structure
Abstract
The HERMES experiment is collecting data on inclusive and semi-inclusive deep inelastic scattering of polarised positrons from polarised targets of H, D, and He. These data give information on the spin structure of the nucleon. This paper describes the forward angle spectrometer built for this purpose. The spectrometer includes numerous tracking chambers (micro-strip gas chambers, drift and proportional chambers) in front of and behind a 1.3 T.m magnetic field, as well as an extensive set of detectors for particle identification (a lead-glass calorimeter, a pre-shower detector, a transition radiation detector, and a threshold Cherenkov detector). Two of the main features of the spectrometer are its good acceptance and identification of both positrons and hadrons, in particular pions. These characteristics, together with the purity of the targets, are allowing HERMES to make unique…
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