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