First test of the CHAOS polarized proton target

Journal Article · Fri Sep 01 04:00:00 EDT 1995 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.48922· OSTI ID:254131

Delheij, P P; Mantel, G; Sekachev, I ^[1]

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1. TRIUMF, 4004 Wesbrook Mall, Vancouver, B.C. V6T 2A3 (Canada)

The CHAOS polarized proton target (CPPT) is a new dynamically polarized target for the recently commissioned Canadian High Acceptance Orbit Spectrometer at TRIUMF. During the first test with a sample, a polarization of 0.70 was obtained in 1 hour and a decay time of 63 hours was measured at a temperature of 60 mK. The target must travel 2 m through a field free region between the polarizing magnet and the spectrometer magnet. Therefore, a superconducting magnet, giving a field of 0.13 T on the target, is incorporated in the cryostat shell surrounding the dilution refrigerator. The magnetic field in the spectrometer will be lowered to 0.5 T. These conditions require the operation in frozen spin mode. Particle access and exit is by two windows spanning 320 degrees in the scattering plane. Vertically the opening angle is {plus_minus}20 degrees. Particles with an energy down to 30 MeV must be observed which requires very thin windows. A major goal is the determination of the {pi}{ital N} {sigma}-term from low energy pion scattering. Then the strange sea quark content of the proton can be derived. {copyright} {ital 1995 American Institute of Physics.}

• OSTI ID: 254131
• Report Number(s): CONF-9409103--
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 343; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
66 PHYSICS
DESIGN
PERFORMANCE
POLARIZATION
POLARIZED TARGETS
PROTONS
RELAXATION TIME
TEMPERATURE RANGE 0000-0013 K