The Longitudinal Polarimeter at HERA

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• 作者：Beckmann ; M. ; Borissov ; A. ; Brauksiepe ; S. ; Burkart ; F. ; Fischer ; H. ; Franz ; J. ; Heinsius ; F.H. ; et. al.
• 关键词：29.20.Dh ; 29.27.Bd ; 29.27.Fh ; 29.27.Hj ; Polarized Compton scattering ; Electron polarimetry
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2002
• 出版时间：March 1, 2002
• 年：2002
• 卷：479
• 期：2-3
• 页码：334-348
• 全文大小：393 K

文摘

The design, construction and operation of a Compton back-scattering laser polarimeter at the HERA storage ring at DESY are described. The device measures the longitudinal polarization of the electron beam between the spin rotators at the HERMES experiment with a fractional systematic uncertainty of 1.6 % . A measurement of the beam polarization to an absolute statistical precision of 0.01 requires typically 1min when the device is operated in the multi-photon mode. The polarimeter also measures the polarization of each individual electron bunch to an absolute statistical precision of 0.06 in approximately 5min. It was found that colliding and non-colliding bunches can have substantially different polarizations. This information is important to the collider experiments H1 and ZEUS for their future longitudinally polarized electron program because those experiments use the colliding bunches only.