Polarised Photon Beams for the BGO-OD Experiment at ELSA

Zimmermann, T. and Bella, A. and Alef, S. and Bayadilov, D. and Beck, R. and Becker, M. and Bielefeldt, P. and Boese, S. and Braghieri, A. and Brinkmann, K. and Cole, P. and Curciarello, F. and De Leo, V. and Di Salvo, R. and Dutz, H. and Elsner, D. and Fantini, A. and Freyermuth, O. and Friedrich, S. and Frommberger, F. and Ganenko, V. and Gervino, G. and Ghio, F. and Giardina, G. and Goertz, S. and Gridnev, A. and Gutz, E. and Hammann, D. and Hannappel, J. and Hartmann, P. and Hillert, W. and Ignatov, A. and Jahn, R. and Joosten, R. and Jude, T. C. and Klein, F. and Koop, K. and Krusche, B. and Lapik, A. and Sandri, P. Levi and Lopatin, I. V. and Mandaglio, G. and Messi, F. and Messi, R. and Metag, V. and Moricciani, D. and Mushkarenkov, A. and Nanova, M. and Nedorezov, V. and Novinskiy, D. and Pedroni, P. and Reitz, B. and Romaniuk, M. and Rostomyan, T. and Rudnev, N. and Schaerf, C. and Scheluchin, G. and Schmieden, H. and Stugelev, A. and Sumachev, V. and Tarakanov, V. and Vegna, V. and Walther, D. and Watts, D. and Zaunick, H.. (2016) Polarised Photon Beams for the BGO-OD Experiment at ELSA. In: Proceedings of the 10th International Workshop on the Physics of Excited Nucleons (NSTAR2015), 10. 032003.

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The new BGO-OD experiment at the electron accelerator ELSA, of the University of Bonn, is designed to study the reaction dynamics of nucleon excitations in meson photoproduction. It consists of a central BGO calorimeter with a magnetic spectrometer in forward direction. The physics programme includes the measurement of polarisation observables using linearly and circularly polarised photon beams. Linear polarisation is obtained by coherent bremsstrahlung off a diamond crystal, and circular polarisation is obtained via bremsstrahlung from longitudinally polarised electrons. The degree of linear polarisation is determined from the bremsstrahlung spectrum itself. To determine the polarisation of the circularly polarised photon beam, the polarisation of the electron beam is measured by a Møller polarimeter. As a preliminary consistency check, the (linear) polarisation observable, Σ, was compared to world data for π^0 and η photoproduction. To determine the degree of circular polarisation, a Møller polarimeter was setup and first measurements of the electron beam polarisation performed.
Faculties and Departments:05 Faculty of Science > Departement Physik > Former Organization Units Physics > Hadronenphysik (Krusche)
UniBasel Contributors:Krusche, Bernd
Item Type:Conference or Workshop Item, refereed
Conference or workshop item Subtype:Conference Paper
Publisher:The Physical Society of Japan
Series Name:JPS Conference Proceedings
Note:Publication type according to Uni Basel Research Database: Conference paper
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Last Modified:17 Mar 2017 15:04
Deposited On:17 Mar 2017 15:04

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