15 July 2008 A versatile facility for the calibration of x-ray polarimeters with polarized and unpolarized controlled beams
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Abstract
We devised and built a versatile facility for the calibration of the next generation X-ray polarimeters with unpolarized and polarized radiation. The former is produced at 5.9 keV by means of a Fe55 radioactive source or by X-ray tubes, while the latter is obtained by Bragg diffraction at nearly 45 degrees. Crystals tuned with the emission lines of X-ray tubes with molybdenum, rhodium, calcium and titanium anodes are employed for the efficient production of highly polarized photons at 2.29, 2.69, 3.69 and 4.51 keV respectively. Moreover the continuum emission is exploited for the production of polarized photons at 1.65 keV and 2.04 keV and at energies corresponding to the higher orders of diffraction. The photons are collimated by means of interchangeable capillary plates and diaphragms, allowing a trade-off between collimation and high fluxes. The direction of the beam is accurately arranged by means of high precision motorized stages, controlled via computer so that long and automatic measurements can be done. Selecting the direction of polarization and the incidence point we can map the response of imaging devices to both polarized and unpolarized radiation. Changing the inclination of the beam we can study the systematic effects due to the focusing of grazing incidence optics and the feasibility of instruments with large field of view.
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Fabio Muleri, Fabio Muleri, Paolo Soffitta, Paolo Soffitta, Ronaldo Bellazzini, Ronaldo Bellazzini, Alessandro Brez, Alessandro Brez, Enrico Costa, Enrico Costa, Massimo Frutti, Massimo Frutti, Marcello Mastropietro, Marcello Mastropietro, Ennio Morelli, Ennio Morelli, Michele Pinchera, Michele Pinchera, Alda Rubini, Alda Rubini, Gloria Spandre, Gloria Spandre, } "A versatile facility for the calibration of x-ray polarimeters with polarized and unpolarized controlled beams", Proc. SPIE 7011, Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray, 701127 (15 July 2008); doi: 10.1117/12.789605; https://doi.org/10.1117/12.789605
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