We discuss polarizing a proton beam in a storage ring, either by selective removal or by spin flip of the stored ions. Prompted by recent, conflicting calculations, we have carried out a measurement of the spin-flip cross section in low-energy electron–proton scattering. The experiment uses the cooling electron beam at COSY as an electron target. The measured cross sections are too small for making spin flip a viable tool in polarizing a stored beam. This invalidates a recent proposal to use co-moving polarized positrons to polarize a stored antiproton beam.

Polarizing a stored proton beam by spin flip?

BARION, Luca;BENATI, Paolo;BERTELLI, Susanna;CIULLO, Giuseppe;CONTALBRIGO, Marco;FERRETTI, Paola;LENISA, Paolo;STANCARI, Giulio;STANCARI, Michelle Dawn;STATERA, Marco;
2009

Abstract

We discuss polarizing a proton beam in a storage ring, either by selective removal or by spin flip of the stored ions. Prompted by recent, conflicting calculations, we have carried out a measurement of the spin-flip cross section in low-energy electron–proton scattering. The experiment uses the cooling electron beam at COSY as an electron target. The measured cross sections are too small for making spin flip a viable tool in polarizing a stored beam. This invalidates a recent proposal to use co-moving polarized positrons to polarize a stored antiproton beam.
D., Oellers; Barion, Luca; S., Barsov; U., Bechstedt; Benati, Paolo; Bertelli, Susanna; D., Chiladze; Ciullo, Giuseppe; Contalbrigo, Marco; Ferretti, Paola; J., Dietrich; N., Dolfus; S., Dymov; R., Engels; W., Erven; A., Garishvili; R., Gebel; P., Goslawski; K., Grigoryev; H., Hadamek; A., Kacharava; A., Khoukaz; A., Kulikov; G., Langenberg; A., Lehrach; Lenisa, Paolo; N., Lomidze; B., Lorentz; G., Macharashvili; R., Maier; S., Martin; S., Merzliakov; I., Meshkov; H., Meyer; M., Mielke; M., Mikirtychiants; S., Mikirtychiants; A., Nass; M., Nekipelov; N., Nikolaev; M., Nioradze; G., D'Orsaneo; M., Papenbrock; D., Prasuhn; F., Rathmann; J., Sarkadi; R., Schleichert; A., Smirnov; H., Seyfarth; J., Sowinski; D., Spoelgen; Stancari, Giulio; Stancari, Michelle Dawn; Statera, Marco; E., Steffens; H., Stein; H., Stockhorst; H., Straatmann; H., Ströher; M., Tabidze; G., Tagliente; P. T., Engblom; S., Trusov; A., Vasilyev; C., Weidemann; D., Welsch; P., Wieder; P., Wüstner; P., Zupranski
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/1377776
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