The CDF level 2 calorimetric trigger upgrade

Journal Article · Thu Jan 01 04:00:00 EST 2009 · Nucl.Instrum.Meth.A598:331-333,2009

DOI:https://doi.org/10.1016/j.nima.2008.08.035· OSTI ID:947208

Bhatti, A; Canepa, A; Casarsa, M; Convery, M; Cortiana, G; Dell'Orso, M; Donati, S; Flanagan, G; Frisch, H; Fukun, T; Krop, D

CDF II upgraded the calorimeter trigger to cope with the higher detector occupancy due to the increased Tevatron instantaneous luminosity ({approx} 2.8 x 10{sup 32} cm{sup -2} s{sup -1}). While the original system was implemented in custom hardware and provided to the L2 trigger a limited-quality jet clustering performed using a reduced resolution measurement of the transverse energy in the calorimeter trigger towers, the upgraded system provides offline-quality jet reconstruction of the full resolution calorimeter data. This allows to keep better under control the dependence of the trigger rates on the instantaneous luminosity and to improve the efficiency and purity of the trigger selections. The upgraded calorimeter trigger uses the general purpose VME board Pulsar, developed at CDF II and already widely used to upgrade the L2 tracking and L2 decision systems. A battery of Pulsars is used to merge and send the calorimeter data to the L2 CPUs, where software-implemented algorithms perform offline-like clustering. In this paper we review the design and the performance of the upgraded system.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 947208
• Report Number(s): FERMILAB-PUB-09-040-E
• Journal Information: Nucl.Instrum.Meth.A598:331-333,2009, Journal Name: Nucl.Instrum.Meth.A598:331-333,2009 Journal Issue: 1 Vol. 598; ISSN NIMAER; ISSN 0168-9002
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ALGORITHMS
CALORIMETERS
COLLIDING BEAMS
DESIGN
EFFICIENCY
FERMILAB COLLIDER DETECTOR
FERMILAB TEVATRON
Instrumentation
LUMINOSITY
PERFORMANCE
PHYSICS
PULSARS
RESOLUTION
TRANSVERSE ENERGY