Electronics for the BaBar central drift chamber

Author

Albert, J. ; Bajic, A. ; Bard, R. ; Beaulieu, M. ; Blinov, V. ; Boyarski, A. ; Broomer, B. ; Coupal, D. ; Corso, F. Dal ; Dolinsky, S. ; Dorfan, D. ; Dow, S. ; Dubrovin, M. ; Dusatko, J. ; Erdos, E. ; Facciai, R. ; Fernandez, J.P. ; Ford, W.T. ; Galeazzi,

Author_Institution

Princeton Univ., NJ, USA

Volume

46

Issue

6

fYear

1999

Firstpage

2027

Lastpage

2032

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-discriminator 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 front 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.

Keywords

drift chambers; nuclear electronics; BaBar central drift chamber; SLAC B-factory; amplifier-discriminator; custom amplifier-discriminator IC; digitizing circuitry; electronics design; prompt trigger data; CMOS integrated circuits; Detectors; Educational institutions; Laboratories; Linear accelerators; Nuclear physics; Optical amplifiers; Optimization; Printed circuits; Structural beams;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/23.819276

Filename

819276