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Proceedings Paper

A magnetic diverter for charged particle background rejection in the SIMBOL-X telescope
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Paper Abstract

Minimization of charged particle background in X-ray telescopes is a well known issue. Charged particles (chiefly protons and electrons) naturally present in the cosmic environment constitute an important background source when they collide with the X-ray detector. Even worse, a serious degradation of spectroscopic performances of the X-ray detector was observed in Chandra and Newton-XMM, caused by soft protons with kinetic energies ranging between 100 keV and some MeV being collected by the grazing-incidence mirrors and funneled to the detector. For a focusing telescope like SIMBOL-X, the exposure of the soft X-ray detector to the proton flux can increase significantly the instrumental background, with a consequent loss of sensitivity. In the worst case, it can also seriously compromise the detector duration. A well-known countermeasure that can be adopted is the implementation of a properly-designed magnetic diverter, that should prevent high-energy particles from reaching the focal plane instruments of SIMBOL-X. Although Newton-XMM and Swift-XRT are equipped with magnetic diverters for electrons, the magnetic fields used are insufficient to effectively act on protons. In this paper, we simulate the behavior of a magnetic diverter for SIMBOL-X, consisting of commercially-available permanent magnets. The effects of SIMBOL-X optics is simulated through GEANT4 libraries, whereas the effect of the intense required magnetic fields is simulated along with specifically-written numerical codes in IDL.

Paper Details

Date Published: 15 July 2008
PDF: 11 pages
Proc. SPIE 7011, Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray, 70112Y (15 July 2008); doi: 10.1117/12.789917
Show Author Affiliations
D. Spiga, INAF, Osservatorio Astronomico di Brera (Italy)
V. Fioretti, INAF, Istituto di Astrofisica Spaziale e Fisica Cosmica (Italy)
A. Bulgarelli, INAF, Istituto di Astrofisica Spaziale e Fisica Cosmica (Italy)
E. Dell'Orto, INAF, Osservatorio Astronomico di Brera (Italy)
Univ. degli Studi dell'Insubria (Italy)
L. Foschini, INAF, Istituto di Astrofisica Spaziale e Fisica Cosmica (Italy)
G. Malaguti, INAF, Istituto di Astrofisica Spaziale e Fisica Cosmica (Italy)
G. Pareschi, INAF, Osservatorio Astronomico di Brera (Italy)
G. Tagliaferri, INAF, Osservatorio Astronomico di Brera (Italy)
A. Tiengo, INAF, Istituto di Astrofisica Spaziale e Fisica Cosmica (Italy)


Published in SPIE Proceedings Vol. 7011:
Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray
Martin J. L. Turner; Kathryn A. Flanagan, Editor(s)

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