[SLAC] [SLAC Pubs and Reports]
SLAC-PUB-7996
Electroniucs for the BaBar Central Drift Chamber
Abstract
The central drift chamber for the BaBar detector at the SLAC B-factory
is based on a hexagonal cell design with 7104 cells arranged in 40
layers and drift gas Helium:isobutane (80%:20%). Performance
optimization and integration requirements led to an electronics design
that mounts the amplifier-descriminator and digitizing circuitry
directly on the endplate. High channel density is achieved using a
4-channel custom amplifier-discriminator IC and an 8-channel custom
CMOS TDC/FADC IC on a single circuit board. Data read from the ends are
multiplexed on 4 fiber optic links, and prompt trigger data are sent
out continuously on 24 links. Analysis of cosmic ray data demonstrates
that the electronics design meets the performance goals for the BaBar
drift chamber. The final electronics were installed on the drift
chamber in July, 1998. Installation of BaBar on beamline is scheduled
for March, 1999.
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