Marcos Bavdaz,1 Anthony J. Peacock,1 Roland H. den Hartog,1 Abel Poelaert,1 Peter J. Underwood,1 Veli-Pekka Viitanen,2 Detlef Fuchs,3 Peter Bulicke,3 Stefan Kraft,3 Frank Scholze,3 Gerhard Ulm,3 Annesley C. Wright4
1European Space Agency/ESTEC (Netherlands) 2Metorex International Oy (Finland) 3Physikalisch-Technische Bundesanstalt (Germany) 4MRIC Research (United Kingdom)
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Soft x-ray detectors for astronomical applications are often also sensitive to visible and UV photons. Filters of a new design have been developed, which could be used in future missions to suppress the flooding of x-ray detectors by low energy photons. Three series of filters are discussed: aluminum/silicon multilayers, Niobium and calcium/boron multilayers. The filters are typically 100 to 200 nm thick and reject the IR/visible/UV from 10-4 to 10-6. The transmission for soft x-rays is above 10% for wavelengths less than 30 nm, when combining the bandpasses of at least two filters. The optimum transmission band depends very much on the filter type. The IR/visible/UV has been measured using standard laboratory spectro- photometers while the x-ray transmission characteristics have been determined using synchrotron radiation.
Marcos Bavdaz,Anthony J. Peacock,Roland H. den Hartog,Abel Poelaert,Peter J. Underwood,Veli-Pekka Viitanen,Detlef Fuchs,Peter Bulicke,Stefan Kraft,Frank Scholze,Gerhard Ulm, andAnnesley C. Wright
"Performance of transmission filters for EUV and soft x-ray astronomy", Proc. SPIE 2808, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy VII, (31 October 1996); https://doi.org/10.1117/12.256004
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Marcos Bavdaz, Anthony J. Peacock, Roland H. den Hartog, Abel Poelaert, Peter J. Underwood, Veli-Pekka Viitanen, Detlef Fuchs, Peter Bulicke, Stefan Kraft, Frank Scholze, Gerhard Ulm, Annesley C. Wright, "Performance of transmission filters for EUV and soft x-ray astronomy," Proc. SPIE 2808, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy VII, (31 October 1996); https://doi.org/10.1117/12.256004