The Development of the Detector and Imaging Systems of the Masco Telescope

Details The Development of the Detector and Imaging Systems of the Masco Telescope The Development of the Detector and Imaging Systems of the Masco Telescope

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997phdt..........d&link_type=abstract

PhD Dissertation, INPE-6409/TDI-619

Other

Imaging Techniques, Detectors, Gamma Ray Telescopes, Angular Resolution, Temporal Resolution, Gamma Rays, Field Of View, Energy Bands, High Resolution, Scintillation Counters

Scientific paper

In this thesis the detector and imaging systems of the MASCO telescope are described. MASCO is a gamma-ray imaging telescope with both high angular resolution and sensitivity. Conceived to be able to individually study sources in crowded fields, MASCO is an ideal mission to map sky regions like the Galactic Center. A revision of recent observational results obtained with imaging telescopes of this particular region is presented. Also presented is the sensitivity of the telescope for pulsed gamma-ray sources, taking GX 1+4 as an example. MASCO employs the coded-aperture imaging technique, and will be the first telescope to use a new type of mask patterns, the modified uniformly redundant arrays (MURAs). The coded-aperture imaging technique is reviewed and interesting properties of the MURAs discussed. This work gives two original contributions for MURA based coded mask telescopes: an empirical rule that says which MURA pattern is convenient to build a mask when we want to make observations with the mask-antimask method and the definition of the rotation center of a MURA pattern. MASCO uses a large number of scintillation detectors. The main detector of the experiment is a 41 cm diameter and 5 cm thick inorganic NaI(Tl) scintillation detector in an Anger Camera configuration, with approximately 10% energy resolution in 662 keV. Organic scintillation detectors are used to minimize the telescope background. and large volume scintillation detectors were built for the first time in Brazil. MASCO uses 12 of these scintillation detectors and the fabrication process are discussed together with tests for 2 different types of these detectors. MASCO shall have an angular resolution of 14 min in a 14 deg field-of-view and 20 micro-s of temporal resolution. A simulated image of the Galactic Center region in the 50-150 keV energy band is presented in order to show the imaging capabilities of the telescope. Preliminary tests results obtained with the detector and imaging systems are also presented together with the first laboratory images of the instrument, another original contribution of this work. These images are, to date, the only images obtained with a mask based in a MURA pattern.

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