1Istituto di Astrofisica Spaziale e Fisica Cosmica (Italy) 2Univ. di Roma Tor Vergata (Italy) 3Istituto Nazionale di Fisica Nucleare (Italy) 4CNR, Istituto Metodologie Inorganiche e dei Plasmi (Italy)
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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.
Fabio Muleri,Paolo Soffitta,Ronaldo Bellazzini,Alessandro Brez,Enrico Costa,Massimo Frutti,Marcello Mastropietro,Ennio Morelli,Michele Pinchera,Alda Rubini, andGloria 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); https://doi.org/10.1117/12.789605
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Fabio Muleri, Paolo Soffitta, Ronaldo Bellazzini, Alessandro Brez, Enrico Costa, Massimo Frutti, Marcello Mastropietro, Ennio Morelli, Michele Pinchera, Alda Rubini, 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); https://doi.org/10.1117/12.789605