Beam-induced resonant depolarization effects in a polarized atomic hydrogen gas target at HERA

Journal Article · Tue Jan 20 04:00:00 EST 1998 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.55019· OSTI ID:21182414

Kolster, H ^[1]

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1. LMU Muenchen, Seklion Physik, Am Coulombwall 1, D-85748 Garching (Germany)

In the HERMES experiment at HERA deep inelastic scattering of polarized positrons from internal polarized gas targets is used to study the spin structure of the nucleons. For the hydrogen target, a strong magnetic field parallel to the positron beam direction is used to maintain the polarization of the atoms inside the target cell. Depolarization of the atoms due to time dependent magnetic fields resulting from the time structure of the high energy positron beam have been studied using a Breit-Rabi type polarimeter. Resonant effects are observed as function of the magnetic holding field. They are in agreement with model expectations. At the working point at 335 mT in between two resonances depolarization is negligible.

• OSTI ID: 21182414
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 421; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ATOMS
DEEP INELASTIC SCATTERING
DEPOLARIZATION
HERA STORAGE RING
HYDROGEN 1 TARGET
MAGNETIC FIELDS
OPTICAL PUMPING
POLARIMETERS
POLARIMETRY
POLARIZATION
POLARIZED BEAMS
POLARIZED TARGETS
POSITRON BEAMS
RESONANCE
TIME DEPENDENCE