Characterization of scatterers for an active focal plane Compton polarimeter |
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| Institution: | 1. Università di Roma “Tor Vergata”, Dipartimento di Fisica, Via della Ricerca Scientifica 1, 00133 Rome, Italy;2. INAF-IAPS, Via del Fosso del Cavaliere 100, 00133 Rome, Italy;1. IRFU, CEA, Université Paris-Saclay, F 91191 Gif-sur-Yvette, France;2. LLR, Ecole Polytechnique, CNRS/IN2P3, 91128 Palaiseau, France;1. ISDC, University of Geneva, Chemin dÉcogia 16, CH-1290 Versoix, Switzerland;2. INAF, Istituto di Astrofisica Spaziale e Fisica Cosmica – Palermo, via U. La Malfa 153, 90146 Palermo, Italy;3. Institut für Astronomie und Astrophysik, Eberhard Karls Universität, Sand 1, 72076 Tübingen, Germany;4. Department of Physics & Astronomy, Wayne State University, 666 W. Hancock St., Detroit, MI 48201, USA;5. INAF, Osservatorio Astronomico di Capodimonte, Salita Moiariello 16, I-80131 Napoli, Italy;6. International Space Science Institute, Hallerstrasse 6, CH-3012 Bern, Switzerland;7. International Space Science Institute in Beijing, No. 1 Nan Er Tiao, Zhong Guan Cun, Beijing 100190, China;1. Physikalisches Institut, University of Bonn, Germany;2. CERN, Geneva, Switzerland;1. Oak Ridge National Laboratory, United States;2. The University of Tennessee, United States;1. Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, 1049-001, Lisboa, Portugal;2. Institute of Nuclear Physics Polish Academy of Sciences, PL-31342, Krakow, Poland;3. Culham Centre for Fusion Energy, Culham, United Kingdom;4. Narodowe Centrum Badań J?drowych (NCBJ), 05-400, Otwock, Poland;5. Istituto di Fisica del Plasma “P. Caldirola”, CNR, Milano, Italy;6. Dipartimento di Fisica “G. Occhialini”, Università degli Studi di Milano-Bicocca, Milano, Italy;7. LibPhys-UC, Department of Physics, University of Coimbra, P-3004 516, Coimbra, Portugal;1. DEI-Politecnico di Bari, Via Orabona 4, I-70125 Bari, Italy;2. INFN, Sezione di Bari, Via Orabona 4, I-70125 Bari, Italy;3. INFN, Laboratori Nazionali di Frascati, Via E. Fermi 40, I-00044 Frascati, Italy |
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| Abstract: | In this work we present an active Compton scattering polarimeter as a focal plane instrument able to extend the X-ray polarimetry towards hard X-rays.Other authors have already studied various instrument design by means of Monte Carlo simulations, in this work we will show for the first time the experimental measurements of “tagging efficiency” aimed to evaluate the polarimeter sensitivity as a function of energy. We performed a characterization of different scattering materials by measuring the tagging efficiency that was used as an input to the Monte Carlo simulation. Then we calculated the sensitivity to polarization of a design based on the laboratory set-up. Despite the geometry tested is not optimized for a realistic focal plane instrument, we demonstrated the feasibility of polarimetry with a low energy threshold of 20 keV. Moreover we evaluated a minimum detectable polarization of 10% for a 10 mCrab source in 100 ks between 20 and 80 keV in the focal plane of one multilayer optics module of NuSTAR. The configuration used consisted of a doped p-terphenyl scatterer 3 cm long and 0.7 cm of diameter coupled with a 0.2 cm thick LaBr3 absorber. |
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