TY - JOUR
T1 - The HERMES polarized hydrogen and deuterium gas target in the HERA electron storage ring
AU - Airapetian, A.
AU - Blok, H.P.
AU - Chen, T.
AU - Hesselink, W.H.A.
AU - Laziev, A.
AU - Volmer, J.
AU - Wang, S.
AU - Smit, G.P.
N1 - The HERMES polarized hydrogen and deuterium gas target in the HERA electron storage ring
PY - 2005
Y1 - 2005
N2 - 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.
AB - 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.
U2 - 10.1016/j.nima.2004.11.020
DO - 10.1016/j.nima.2004.11.020
M3 - Article
SN - 0168-9002
VL - 540
SP - 68
EP - 101
JO - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment
IS - 1
ER -