Development and application of photosensitive device systems to studies of biological and organic materials Page: 4 of 27
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of meeting some of the more difficult detector requirements encountered at storage ring
The results of the tests were reported at several crystallographic meetings to a great
degree of enthusiasm. This led to the formation of a collaborative effort between our group,
CHESS, and others to develop a detector for use at CHESS based on a 2048 x2048 CCD and
a 3:1 fiber-optic taper (see the Supplemental Application dated Nov. 11, 1991 or the current
renewal application, date May, 1992 for a complete description of the collaboration). This
detector will serve as a test platform for similar devices intended for beamlines at the APS.
B) Other CCD Detector Designs
References: Tate (1991); Eikenberry et al, 1992; manuscripts in preparation.
Three other CCD detector designs were also carried through to completion, including
assemble, testing, and installation for dedicated research use. The first design is a retrofit
of the detector of Reynolds et al, 1978 (Rev. Sci. Instr. \9'. 1241) by replacement of
the slow-scan vidicon camera with a commercially available cooled, slow-scan CCD unit
(Photometries model CC-200). The result was a great improvement in overall performance,
including a wider dynamic range, better resolution, less distortion, better stability, and
fewer systematic effects. The detector allowed operation of the image intensifier in the
system at a fraction of the gain needed with the old vidicon camera. Non-linearity problems
in the A/D electronics were encountered with the Photometries CC-200 200 Khz camera
design which necessitated using a 50 Khz model. This detector is now in dedicated use in
our laboratory and will be fully described in a manuscript in preparation. It is suitable
for SAXS problems for which an appropriate image intensifier is available.
The second detector design consists of a custom fabricated 80 mm input area single
stage zoom intensifier lens coupled to a TEK512 CCD. This detector has the advantage
of a larger input area and at least two vendors who are willing to supply the image inten-
sifier. It has the disadvantages of a compromised resolution when operated at sufficient
reduction in the image tube to achieve high gain, quantum limited operation. Although
the detector is quite suitable for use with diffuse signals, it was decided to try and improve
the characteristics by operating with less image reduction in the intensifier and to perform
the remaining reduction and image coupling via a reducing fiber-optic taper. The new
configuration is now under assembly. The detector is intended to be used for polymer and
membrane diffraction problems.
The final detector configuration consists of a single stage proximity focussed intensifier
with a custom, low persistence phosphor coupled via a 5:1 fiber-optic taper to a fiber-optic
input Thomson 512 x 512 detector. The CCD is controlled by a Princeton Scientific
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Gruner, S.M. & Reynolds, G.T. Development and application of photosensitive device systems to studies of biological and organic materials, report, May 15, 1992; United States. (https://digital.library.unt.edu/ark:/67531/metadc1072386/m1/4/?rotate=270: accessed May 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.