Imaging in High Energy Astronomy: Proceedings of the by G. K. Skinner (auth.), L. Bassani, G. Di Cocco (eds.)
By G. K. Skinner (auth.), L. Bassani, G. Di Cocco (eds.)
An nearly whole number of the papers given on the foreign Workshop on Imaging in excessive strength Astronomy (Anacapri, Italy, 1994). those complaints, which pay attention to imaging above 10 keV, signify the cutting-edge within the box, because of the luck of many missions (I.C. Granat and CGRO) wearing detectors for top power astronomy with imaging services. the most issues of the booklet are Bragg concentrators, coded mask-modulation collimators, double Compton telescopes, the occultation strategy, monitoring chambers, and new experimental recommendations. The publication additionally comprises a few papers facing photo reconstruction and processing, with an emphasis at the above techniques.
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Extra info for Imaging in High Energy Astronomy: Proceedings of the International Workshop held in Anacapri (Capri-Italy), 26–30 September 1994
For energetic gamma rays the diffraction angle (Bragg angle) is quite small and Laue geometry makes much more efficient use of the crystalline material. Laue Crystal Bragg Crystal ,... 3 em Footprint lc~ InCident Beam J lcm Diffracted Beam lcm Incident Beam 1 em Footprint 1 cm Diffracted Beam Figure 2. Comparison of Bragg and Laue Diffraction Crystals Crystal lenses are further subdivided into condenser type lenses 1-6 that concentrate a large amount of radiation on a small focal spot and whose spatial resolution in the image plane is about the size of the individual diffraction crystals, and the point-topoint focusing type lenses l ,2,3,5,7,8 that produce real images of the source as well as a high concentration of photons at the focal point.
Landini, G. : 1991, 'Hard X-ray Imaging via Crystal Diffraction: First Results of Reflectivity Measurements', Proc. SPIE 1549, 113. Frontera, F. , Landini, G. : 1993, 'Hard X-ray (>15 keY) Facility for Calibration of Space Astronomy Experiments', IEEE Tran,. on Nucl. , 40, 874. Frontera, F. : 1994, 'Polarimetric performance of a Bragg hard X-ray (>10 keY) Concentrator', Proc. SPIE 2283, 85. : 1991, 'Modelling of Capillary Optics as a Focussing Hard X-ray Concentrator', Proc. SPIE 1548, 91. Joensen, K.
10-5~~~~~~~~~~~~~~~~~~~~~ Obs Time = 10e5 see; FL = 5 m SIN = 5 ; Energy bandwidth = 10 % No residual atmosphere Imaging resolution = 1 aremin Ni/C 10 - 7 - - -. :-=-:"::::':::"----- 30 W/Si 40 50 Energy (keV) 60 70 Figure 8. Continuum sensitivity for a satellite relevant observation. Parameters are given in the plot and in the text. 44 FE. CHRISTENSEN ET AL. 4 COMPARISON TO A NON FOCUSING TELESCOPE. For a background limited observation the figure of merit for comparing a focusing with a non focusing imaging telescope, is (see equation 2): FOM = (3) For a non focusing telescope based on a coded aperture.