| Autor: |
Spiga, D., Fioretti, V., Bulgarelli, A., Dell'Orto, E., Foschini, L., Malaguti, G., Pareschi, G., Tagliaferri, G., Tiengo, A. |
| Rok vydání: |
2015 |
| Předmět: |
|
| Zdroj: |
Proceedings of the SPIE, Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray, Vol. 7011, 70112Y (2008) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1117/12.789917 |
| Popis: |
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. |
| Databáze: |
arXiv |
| Externí odkaz: |
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