The CLEO-III trigger: level 1 decision and gating

Author

Bergfeld, T.J. ; Ernst, J.A. ; Gollin, G.D. ; Haney, M.J. ; Hans, R.M. ; Johnson, E.E. ; Plage, C.L. ; Sedlack, C. ; Selen, M.A. ; Williams, J.B.

Author_Institution

Dept. of Phys., Illinois Univ., Urbana, IL, USA

Volume

2

fYear

2000

fDate

2000

Firstpage

17868

Abstract

The Level 1 Decision and Data Flow/Control subsystems of the CLEO-III Trigger produce and distribute a trigger decision every 42 ns based on input from calorimetry and tracking subsystems. This paper describes the free-running pipelined trigger decision logic that correlates axial and stereo tracking information, and combines time-aligned calorimetry information onto a common backplane. Programmable trigger decision boards monitor this backplane, and can be configured as desired to respond to a wide variety of trigger conditions. The resulting trigger decision is regulated by a throttling mechanism that allows the data acquisition system to modulate the trigger rate to maximize throughput without buffer overrun. A central signal distribution mechanism delivers the trigger decision and system clock to the front-end electronics

Keywords

data acquisition; drift chambers; liquid scintillation detectors; nuclear electronics; particle calorimetry; trigger circuits; 42 ns; CLEO-III trigger; Data Flow/Control subsystem; axial tracking information; free-running pipelined trigger decision logic; front-end electronics; level 1 decision; programmable trigger decision boards; stereo tracking information; tracking subsystems; Backplanes; Calorimetry; Circuit topology; Clocks; Condition monitoring; Data acquisition; Detectors; Logic; Physics; Wire;

fLanguage

English

Publisher

ieee

Conference_Titel

Nuclear Science Symposium Conference Record, 2000 IEEE

Conference_Location

Lyon

ISSN

1082-3654

Print_ISBN

0-7803-6503-8

Type

conf

DOI

10.1109/NSSMIC.2000.949938

Filename

949938