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FERMILAB-Conf-03/168-E June 2003
The CDF Silicon Vertex Trigger*
Bill Ashmanskasat, A. Barchiesib, A. BardiC, M. Barid, M. Baumgarte, S. Belforted, J. Berryhille,
M. Bogdane, R. CarosiC, A. Cerrif, G. Chlachidzeg, R. Culbertsone, M. Dell'OrsoC, S. DonatiC, I. Fiorih,
H. Frische, S. Galeottic, P. GiannettiC, V. Glagolevg, A. Leger', Y. Liu', T. Maruyamae, E. MeschiC,
L. Moneta', F. MorsaniC, T. Nakayae, G. PunziC, M. Rescignob, L. RistoriC, H. Sanderse, S. Sarkarb,
A. Semenovg, M. Shochete, T. Speer', F. Spinellac, H. VatagaC, X. Wu', U.K. Yange, L. Zanellob,
(for the CDF-II Collaboration)
aArgonne National Laboratory, Argonne, IL 60439, USA
bINFN, Sezione di Roma I and University La Sapienza, I-00173 Roma, Italy
CINFN, University and Scuola Normale Superiore of Pisa, I-56100 Pisa, Italy
dINFN, Sezione di Trieste, I-34012 Trieste, Italy
eEnrico Fermi Institute, University of Chicago, Chicago, IL 60637, USA
fLawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
9Joint Institute for Nuclear Research, Dubna, Russia
hUniversity of Padova and INFN, Sezione di Padova, I-35031 Padova, Italy
'University of Geneva, CH-122, Geneva 4, Switzerland
The CDF experiment's Silicon Vertex Trigger is a system of 150 custom 9U VME boards that reconstructs
axial tracks in the CDF silicon strip detector in a 15 psec pipeline. SVT's 35 pm impact parameter resolution
enables CDF's Level 2 trigger to distinguish primary and secondary particles, and hence to collect large samples of
hadronic bottom and charm decays. We review some of SVT's key design features. Speed is achieved with custom
VLSI pattern recognition, linearized track fitting, pipelining, and parallel processing. Testing and reliability are
aided by built-in logic state analysis and test-data sourcing at each board's input and output, a common inter-
board data link, and a universal "Merger" board for data fan-in/fan-out. Speed and adaptability are enhanced
by use of modern FPGAs.
1. CDF TRIGGER OVERVIEW
The recently upgraded Collider Detector at
Fermilab (CDF) experiment  pursues a broad
physics program at Fermilab's Tevatron proton-
antiproton collider, comprising topics as diverse
as top quark production and charmed meson de-
cay. In the present Tevatron data-taking period
*Talk presented at the 9th Pisa Meeting on Advanced De-
tectors, La Biodola, Isola d'Elba, May 25-31, 2003.
tCorresponding author. E-mail: wja~hep.and.gov
("Run 2"), the c.m. energy is fi = 1.96 TeV,
the bunch-crossing interval is 396 ns (with a pos-
sible upgrade to 132 ns for high luminosity), and
peak luminosities are 0.5 x 1032 cm--2S-1 to date
and climbing toward a goal of 2 x 1032 cm-2S-1.
CDF's new drift chamber  and silicon detec-
tor  are discussed in detail elsewhere in these
One challenge for a hadron collider experi-
ment is to extract signals of interest efficiently
from much larger backgrounds. To illustrate the
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Ashmanskas, B.; Barchiesi, A. & Bardi, A. The CDF silicon vertex trigger, article, June 23, 2003; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc737597/m1/1/: accessed December 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.