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The OLYMPUS Experiment

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arxiv 1312.1730 v1 pith:WZRWHI5Q submitted 2013-12-05 physics.ins-det nucl-ex

The OLYMPUS Experiment

R. Milner , D.K. Hasell , M. Kohl , U. Schneekloth , N. Akopov , R. Alarcon , V.A. Andreev , O. Ates
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A. Avetisyan D. Bayadilov R. Beck S. Belostotski J.C. Bernauer J. Bessuille F. Brinker B. Buck J.R. Calarco V. Carassiti E. Cisbani G. Ciullo M. Contalbrigo N. D'Ascenzo R. De Leo J. Diefenbach T.W. Donnelly K. Dow G. Elbakian D. Eversheim S. Frullani Ch. Funke G. Gavrilov B. Gl\"aser N. G\"orrissen J. Hauschildt B.S. Henderson Ph. Hoffmeister Y. Holler L.D. Ice A. Izotov R. Kaiser G. Karyan J. Kelsey D. Khaneft P. Klassen A. Kiselev A. Krivshich I. Lehmann P. Lenisa D. Lenz S. Lumsden Y. Ma F. Maas H. Marukyan O. Miklukho A. Movsisyan M. Murray Y. Naryshkin C. O'Connor R. Perez Benito R. Perrino R.P. Redwine D. Rodr\'iguez Pi\~neiro G. Rosner R.L. Russell A. Schmidt B. Seitz M. Statera A. Thiel H. Vardanyan D. Veretennikov C. Vidal A. Winnebeck V. Yeganov
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The OLYMPUS experiment was designed to measure the ratio between the positron-proton and electron-proton elastic scattering cross sections, with the goal of determining the contribution of two-photon exchange to the elastic cross section. Two-photon exchange might resolve the discrepancy between measurements of the proton form factor ratio, $\mu_p G^p_E/G^p_M$, made using polarization techniques and those made in unpolarized experiments. OLYMPUS operated on the DORIS storage ring at DESY, alternating between 2.01~GeV electron and positron beams incident on an internal hydrogen gas target. The experiment used a toroidal magnetic spectrometer instrumented with drift chambers and time-of-flight detectors to measure rates for elastic scattering over the polar angular range of approximately $25^\circ$--$75^\circ$. Symmetric M{\o}ller/Bhabha calorimeters at $1.29^\circ$ and telescopes of GEM and MWPC detectors at $12^\circ$ served as luminosity monitors. A total luminosity of approximately 4.5~fb$^{-1}$ was collected over two running periods in 2012. This paper provides details on the accelerator, target, detectors, and operation of the experiment.

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