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18 July 2000 Hard x-ray characterization of a HEFT single-reflection prototype
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We have measured the hard X-ray reflectivity and imaging performance from depth graded W/Si multilayer coated mirror segments mounted in a single reflection cylindrical prototype for the hard X-ray telescopes to be flown on the High Energy Focusing Telescope (HEFT) balloon mission. Data have been obtained in the energy range from 18 - 170 keV at the European Synchrotron Radiation Facility and at the Danish Space Research Institute at 8 keV. The modeling of the reflectivity data demonstrate that the multilayer structure can be well described by the intended power law distribution of the bilayer thicknesses optimized for the telescope performance and we find that all the data is consistent with an interfacial width of 4.5 angstroms. We have also demonstrated that the required 5% uniformity of the coatings is obtained over the mirror surface and we have shown that it is feasible to use similar W/Si coatings for much higher energies than the nominal energy range of HEFT leading the way for designing Gamma-ray telescopes for future astronomical applications. Finally we have demonstrate 35 arcsecond Half Power Diameter imaging performance of the one bounce prototype throughout the energy range of the HEFT telescopes.
© (2000) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Finn Erland Christensen, William W. Craig, Charles J. Hailey, Mario A. Jimenez-Garate, David L. Windt, Fiona A. Harrison, Peter H. Mao, Eric Ziegler, Veijo Honkimaki, Manuel Sanchez del Rio, Andreas K. Freund, and M. Ohler "Hard x-ray characterization of a HEFT single-reflection prototype", Proc. SPIE 4012, X-Ray Optics, Instruments, and Missions III, (18 July 2000);


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