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features up to 100 MHz operation, 6 Bit A/D and fast
sparsification to eliminate zero pixels - pixels below
minimum threshold. This latter feature is particularly
important for data handling: in a typical fixed target
event only 10% 'f pixels are acti7'e; for a collider
detector, which does not see the primary interaction
directly but rather emerging secondaries, the number of
active pixels is even further reduced. This is still true
at SSC luminosities, where numerous events (-10) can occur
in a typical integration time of -100 as. For temporary
data storage VDAS utilizes an 8 MByte FI/FO (expandable to
256 MBytes). The data is successively shifted through the
FI/FO, pro-iding amply time for the formation of a high
level trigger to decide whether to write the data to tape or
optical disk.
The VDAS system represents an important initial step in
data handling and processing. Nevertheless, further effort
is definitely required to understand how to accomodate data
from the ~-1000 CCDs needed to image a large scintillating
fiber detector such as the SCIFID device considered at
Snowmass '84.12
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Bross, A. & Ruchti, R. Scintillation techniques and optical devices: summary report of the working group, article, February 1, 1986; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc1061381/m1/13/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.