Large acceptance magnetic spectrometers for polarized deep inelastic electron scattering
The design of two magnetic spectrometers for the measurement of the spin-dependent structure function g{sub 1}{sup n} of the neutron and a test of the Bjorken sum rule is described. The measurement will consist of scattering 23 GeV polarized electrons off a polarized {sup 3}He target and detecting scattered electrons of 7 to 18 GeV at 4.5{degree} and 7{degree}. Each spectrometer is based on two large aperture dipole magnets bending in opposite directions. This reverse'' deflection design doubles the solid angle as compared to the conventional design of same direction bends used in previous experiments. Proper choice of the deflection angles and the distance between the two dipoles in each spectrometer allows background photons from radiative processes to reach the detectors only after at least two bounces off the spectrometer vacuum walls, resulting in an expected tolerable background. Each spectrometer is equipped with a pair of Cerenkov detectors, a pair of scintillation hodoscopes and a lead-glass shower calorimeter providing electron and pion identification with angular and momentum resolutions sufficient for the experimental measurement. 7 refs., 8 figs., 1 tab.
- Research Organization:
- Stanford Linear Accelerator Center, Menlo Park, CA (United States)
- Sponsoring Organization:
- DOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 6060580
- Report Number(s):
- SLAC-PUB-5678; CONF-911106--51; ON: DE92004948
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
663420 -- Lepton-Induced Reactions & Scattering-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYONS
BEAMS
CHARGED-PARTICLE REACTIONS
CHERENKOV COUNTERS
DEEP INELASTIC SCATTERING
DESIGN
ELECTRON REACTIONS
ELEMENTARY PARTICLES
ENERGY RESOLUTION
FERMIONS
FUNCTIONS
HADRONS
HELIUM 3 TARGET
INELASTIC SCATTERING
INTERACTIONS
LEPTON REACTIONS
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
MAGNETIC SPECTROMETERS
MEASURING INSTRUMENTS
NEUTRONS
NUCLEAR REACTIONS
NUCLEONS
PARTICLE INTERACTIONS
POLARIZED BEAMS
RADIATION DETECTORS
RESOLUTION
SCATTERING
SHOWER COUNTERS
SPECTROMETERS
STRUCTURE FUNCTIONS
TARGETS