Increasing luminosity at the Fermilab Tevatron collider has led the D0 collaboration to make improvements to its detector beyond those already in place for Run IIa, which began in March 2001. One of the cornerstones of this Run IIb upgrade is a completely redesigned level-1 calorimeter trigger system. The new system employs novel architecture and algorithms to retain high efficiency for interesting events while substantially increasing rejection of background. We describe the design and implementation of the new level-1 calorimeter trigger hardware and discuss its performance during Run IIb data taking. In addition to strengthening the physics capabilities of D0, this trigger system will provide valuable insight into the operation of analogous devices to be used at LHC experiments.
|Original language||English (US)|
|Number of pages||23|
|Journal||Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment|
|State||Published - Jan 1 2008|
Bibliographical noteFunding Information:
We gratefully acknowledge the guidance of George Ginther, Jon Kotcher, Vivian O’Dell, and Paul Padley as managers of the Run IIb project, as well as the technical advice of Dean Schamberger. We would also like to thank Samuel Calvet, Kayle DeVaughan, Ken Herner, Marc Hohlfeld, Bertrand Martin, and Thomas Millet for analyzing L1Cal data and for producing the performance plots shown in this paper. Finally, we thank the staffs at Fermilab and the collaborating institutions, and acknowledge support from the DOE and NSF (USA); CEA (France); and the CRC Program, CFI and NSERC (Canada).