Abstract
We give the results of an analysis of some 18 rise-time calibrations which are based on data collected in 1996/97. Such measurements are used to determine the absolute polarization scale of the transverse electron beam Polarimeter (TPOL) at HERA. The results of the 1996/97 calibrations are found to be in good agreement with earlier calibrations of the TPOL performed in 1994 with errors of 1.2% and 1.1%. Based on these calibrations and a comparison with measurements from the longitudinal Polarimeter (LPOL) at HERA carried out over a two-months period in 2000, we obtain a mean LPOL/TPOL ratio of 1.018. Both Polarimeters are found to agree with each other within their overall errors of about 2% each.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
D.P. Barber et al., The HERA Polarimeter and the first observation of electron spin polarization at HERA, Nucl. Instr. Meth. A329 (1993) 79.
D.P. Barber et al., High Spin polarization at the HERA electron storage ring, Nucl. Instr. Meth. A338 (1994) 166.
D.P. Barber et al., The first achievement of longitudinal spin polarization in a high energy electron storage ring, Phys. Lett. B434 (1995) 436.
D. Westphal et al., Polarisationsmessungen am HERA Elektronenstrahl, DESY F35D-93-04, diploma thesis, Univ. Hamburg, 1993.
K.P. Schüler, Polarimetry at HERA, Proc. 12th Int. Symp. on High Energy Spin Physics (SPIN 96) Amsterdam, eds. C.W. de Jaeger et al., World Scientific, 1997, p. 822.
K. Long, K.P. Schüler, Polarisation measurements on e± beams, NIM A, article in press.
M. Beckmann et al., The Longitudinal Polarimeter at HERA, Nucl. Instr. Meth. A479 (2002) 334.
A.A. Sokolov, I.M. Ternov, Sov. Phys. Doklady 8 (1964) 1203; I.M. Ternov, Yu.M. Loskutov, L.I. Korovina, Sov. Phys. JETP 14 (1962) 921.
Ya.S. Derbenev, A.M. Kondratenko, Sov. Phys. JETP 37 (1973) 968; S.R. Mane, Phys. Rev. A36 (1987) 105.
D.P. Barber, G. Ripken, Radiative Polarization, Computer Algorithms and Spin Matching in Electron Storage Rings, Handbook of Accelerator Physics and Engineering, eds. A.W. Chao and M. Tigner, 2nd edition, World Scientific, 2002.
D.P. Barber, private communications
F. Zetsche, Use of Resonant Depolarization at the HERA Electron Ring, Proc. 12th Int. Symp. on High Energy Spin Physics (SPIN 96) Amsterdam, eds. C.W. de Jaeger et al., World Scientific, 1997, p. 846.
S. Barrow et al., Interim Report on the Measurement of the Positron Beam Polarization, HERMES Polarimeter Note, Jan. 1996.
Particle Data Group, Review of Particle Physics, Chapter 4.2 Averages and fits, Eur. Phys. J. C3 (1998) p. 10.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2003 Springer Science+Business Media Dordrecht
About this chapter
Cite this chapter
Gharibyan, V., Schüler, K.P. (2003). HERA Transverse Polarimeter Absolute Scale and Error by Rise-Time Calibration. In: Steffens, E., Shanidze, R. (eds) Spin Structure of the Nucleon. NATO Science Series II: Mathematics, Physics and Chemistry, vol 111. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0165-6_14
Download citation
DOI: https://doi.org/10.1007/978-94-010-0165-6_14
Publisher Name: Springer, Dordrecht
Print ISBN: 978-1-4020-1441-3
Online ISBN: 978-94-010-0165-6
eBook Packages: Springer Book Archive