Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Design and Testing of a Prototype Pixellated CZT Detector and Shield for
  Hard X-Ray Astronomy   We report on the design and laboratory testing of a prototype imaging CZT
detector intended for balloon flight testing in April 2000. The detector tests
several key techniques needed for the construction of large-area CZT arrays, as
required for proposed hard X-ray astronomy missions. Two 10 mm x 10 mm x 5 mm
CZT detectors, each with a 4 x 4 array of 1.9 mm pixels on a 2.5 mm pitch, will
be mounted in a ``flip-chip'' fashion on a printed circuit board carrier card;
the detectors will be placed 0.3 mm apart in a tiled configuration such that
the pixel pitch is preserved across both crystals. One detector is eV Products
high-pressure Bridgman CZT, and the other is IMARAD horizontal Bridgman
material. Both detectors are read out by a 32-channel VA-TA ASIC controlled by
a PC/104 single-board computer. A passive shield/collimator surrounded by
plastic scintillator surrounds the detectors on five sides and provides a ~45
deg field of view. The background spectrum recorded by this instrument will be
compared to that measured by a single-element CZT detector (10 mm x 10 mm x 2
mm high-pressure Bridgman material from eV Products) fitted with the same
passive/plastic collimator but including an active BGO shield to the rear. This
detector has been previously flown by us completely shielded by a passive
cover. We describe preliminary laboratory results for the various systems,
discuss initial background simulations, and describe our plans for balloon
flight tests.

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The categories of this paper are: supr-con
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The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-lat
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The categories of this paper are: plasm-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: eess
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The categories of this paper are: solv-int
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The categories of this paper are: math-ph