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Proceedings Paper

A very compact polarizer for an x-ray polarimeter calibration
Author(s): Fabio Muleri; Paolo Soffitta; Ronaldo Bellazzini; Alessandro Brez; Enrico Costa; Sergio Fabiani; Massimo Frutti; Massimo Minuti; Maria Barbara Negri; Piermarco Pascale; Alda Rubini; Giuseppe Sindoni; Gloria Spandre
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Paper Abstract

We devised and built a light, compact and transportable X-ray polarized source based on the Bragg diffraction at nearly 45 degrees. The source is composed by a crystal coupled to a small power X-ray tube. The angles of incidence are selected by means of two orthogonal capillary plates which, due to the small diameter holes (10 μm) allow good collimation with limited sizes. All the orders of diffraction defined by the crystal lattice spacing are polarized up to the maximum order limited by the X-ray tube voltage. Selecting suitably the crystal and the X-ray tube, either the line or the continuum emission can be diffracted, producing polarized photons at different energies. A very high degree of polarization and reasonable fluxes can be reached with a suitable choice of the capillary plates collimation. We present the source and test its performances with the production of nearly completely polarized radiation at 2.6, 5.2, 3.7 and 7.4 keV thanks to the employment of graphite and aluminum crystals, with copper and calcium X-ray tubes respectively. Triggered by the very compact design of the source, we also present a feasibility study for an on-board polarized source, coupled to a radioactive Fe55 nuclide and a PVC thin film, for the calibration of the next generation space-borne X-ray polarimeters at 2.6 and 5.9 keV.

Paper Details

Date Published: 13 September 2007
PDF: 12 pages
Proc. SPIE 6686, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XV, 668610 (13 September 2007); doi: 10.1117/12.734647
Show Author Affiliations
Fabio Muleri, Istituto di Astrofisica Spaziale e Fisica Cosmica (Italy)
Univ. di Roma Tor Vergata (Italy)
Paolo Soffitta, Istituto di Astrofisica Spaziale e Fisica Cosmica (Italy)
Ronaldo Bellazzini, Istituto Nazionale di Fisica Nucleare (Italy)
Alessandro Brez, Istituto Nazionale di Fisica Nucleare (Italy)
Enrico Costa, Istituto di Astrofisica Spaziale e Fisica Cosmica (Italy)
Sergio Fabiani, Istituto di Astrofisica Spaziale e Fisica Cosmica (Italy)
Massimo Frutti, Istituto di Astrofisica Spaziale e Fisica Cosmica (Italy)
Massimo Minuti, Istituto Nazionale di Fisica Nucleare (Italy)
Maria Barbara Negri, Agenzia Spaziale Italiana (Italy)
Piermarco Pascale, Istituto di Astrofisica Spaziale e Fisica Cosmica (Italy)
Alda Rubini, Istituto di Astrofisica Spaziale e Fisica Cosmica (Italy)
Giuseppe Sindoni, Istituto di Astrofisica Spaziale e Fisica Cosmica (Italy)
Gloria Spandre, Istituto Nazionale di Fisica Nucleare (Italy)


Published in SPIE Proceedings Vol. 6686:
UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XV
Oswald H.W. Siegmund, Editor(s)

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