The HERMES experiment is collecting data on inclusive and semi-inclusive deep inelastic scattering of polarised positrons from polarised targets of H, D, and 3He. 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 contributions to the understanding of how the spins of the quarks contribute to the spin of the nucleon.
|Number of pages
|Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
|Published - Nov 11 1998
Bibliographical noteFunding Information:
This project has been supported by the FWO-Flanders, Belgium; the Natural Sciences and Engineering Council of Canada; the Dutch Foundation for Fundamenteel Onderzoek der Materie (FOM); the German Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie; the German Academic Exchange Service (DAAD); the Italian Istituto Nazionale di Fisica Nucleare (INFN); Monbusho International Scientific Research Program, JSPS, and Toray Science Foundation of Japan; the United Kingdom Particle Physics and Astronomy Research Council; the U.S. Department of Energy and National Science Foundation; and INTAS, HCM, and TMR contributions from the European Community.
- Deep inelastic lepton scattering
- Magnetic Spectrometer
- Semi-inclusive scattering
ASJC Scopus subject areas
- Nuclear and High Energy Physics