The HERMES polarized hydrogen and deuterium gas target in the HERA electron storage ring

A. Airapetian, H.P. Blok, T. Chen, W.H.A. Hesselink, A. Laziev, J. Volmer, S. Wang, G.P. Smit

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

The HERMES hydrogen and deuterium nuclear-polarized gas targets have been in use since 1996 with the polarized electron beam of HERA at DESY to study the spin structure of the nucleon. Polarized atoms from a Stern-Gerlach Atomic Beam Source are injected into a storage cell internal to the HERA electron ring. Atoms diffusing from the center of the storage cell into a side tube are analyzed to determine the atomic fraction and the atomic polarizations. The atoms have a nuclear polarization, the axis of which is defined by an external magnetic holding field. The holding field was longitudinal during 1996-2000, and was changed to transverse in 2001. The design of the target is described, the method for analyzing the target polarization is outlined, and the performance of the target in the various running periods is presented. © 2004 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)68-101
JournalNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment
Volume540
Issue number1
DOIs
Publication statusPublished - 2005

Bibliographical note

The HERMES polarized hydrogen and deuterium gas target in the HERA electron storage ring

Fingerprint

Dive into the research topics of 'The HERMES polarized hydrogen and deuterium gas target in the HERA electron storage ring'. Together they form a unique fingerprint.

Cite this