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Precise measurement of the longitudinal polarisation at HERA with a Fabry-Perot cavity polarimeter

Abstract : A Fabry-Perot cavity polarimeter installed in 2003 at HERA was designed to measure the longitudinal polarisation of the electron beam with high precision for each electron bunch spaced with a time interval of 96 ns. By interacting a high intensity laser (enhanced up to a few kW within the cavity) with the HERA electron beam it is possible to measure its polarisation with a relative statistical precision of 2% per bunch per minute. Detailed systematics studies have been performed and in particular a complete theoretical model has been developed in order to control at the per mill level the degree of circular polarisation of the laser beam. The result is a total systematic uncertainty of 1%. This is the first time that such a precision is achieved in the difficult, hostile and noisy environment of a particle collider.
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Submitted on : Friday, June 10, 2011 - 10:58:32 AM
Last modification on : Wednesday, September 16, 2020 - 4:26:43 PM

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M. Jacquet. Precise measurement of the longitudinal polarisation at HERA with a Fabry-Perot cavity polarimeter. Workshop on Sources of Polarized Leptons and High Brightness Electron Beams (PESP2010), Sep 2010, Bonn, Germany. 012023 (8 p.), ⟨10.1088/1742-6596/298/1/012023⟩. ⟨in2p3-00599583⟩

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