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A magnetic spectrometer for electron-positron pair spectroscopy in storage rings |
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| Authors: | Siegbert Hagmann Pierre-Michel Hillenbrand Yuri A. Litvinov Uwe Spillmann Thomas Stöhlker |
| Affiliation: | 1. Department of Atomic Physics, GSI Helmholtz-Zentrum Darmstadt, Darmstadt, Germany;2. Department of Atomic Physics, GSI Helmholtz-Zentrum Darmstadt, Darmstadt, Germany Department of Physics, Columbia University, New York, NY;3. Department of Atomic Physics, GSI Helmholtz-Zentrum Darmstadt, Darmstadt, Germany Department of Atomic Physics, Helmholtz Institut Jena, Jena, Germany IOQ, Universität Jena and HI, Jena, Germany |
| Abstract: | We report an analysis of electron-optical properties of a toroidal magnetic sector spectrometer and examine parameters for its implementation in a relativistic heavy-ion storage ring, for example the High Energy Storage ring (HESR) at the future Facility for Antiproton and Ion Research (FAIR) facility. For studies of free–free pair production in heavy-ion atom collisions, this spectrometer exhibits very high efficiencies for coincident e+–e− pair spectroscopy over a wide range of momenta of emitted lepton pairs. The high coincidence efficiency of the spectrometer is the key for stringent tests of theoretical predictions for the phase space correlation of lepton vector momenta in free–free pair production. |
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