The new UA1 calorimeter trigger processor

Author

Baird, S.A. ; Bains, N. ; Campbell, D. ; Cawthraw, M. ; Charlton, D. ; Coughlan, J. ; Eisenhandler, E. ; Ellis, N. ; Fensome, I. ; Flynn, P. ; Galagadera, S. ; Garvey, J. ; Grayer, G. ; Gregory, J. ; Halsall, R. ; Jimack, M.P. ; Jovanovic, P. ; Kenyon, I.

Author_Institution

Rutherford Appleton Lab., Chilton, Didcot, UK

Volume

36

Issue

1

fYear

1989

fDate

2/1/1989 12:00:00 AM

Firstpage

364

Lastpage

369

Abstract

The UA1 first level trigger processor (TP) is a fast digital machine with a highly parallel pipelined architecture of fast combinational and programmable transistor-transistor logic controlled by programmable microsequencers. The TP uses 100000 ICs (integrated circuits) housed in 18 crates each containing 21 FASTBUS-sized molecules. It is hardwired with a very high level of interconnection. The energy deposited in the upgraded calorimeter is digitized into 1700 bytes of input data every beam crossing (3.8 μs). The processor selects in 1.5 μs events for further processing (1 in 30000). The trigger has improved hadron jet rejection, achieved by requiring low-energy deposition around the electromagnetic cluster. A missing-transverse-energy trigger and a total-energy trigger have also been implemented

Keywords

calorimeters; multiprocessing systems; physics computing; signal processing equipment; special purpose computers; 1.5 mus; 1700 B; 3.8 mus; FASTBUS; UA1 first level trigger processor; hadron jet rejection; missing-transverse-energy trigger; parallel pipelined architecture; programmable microsequencers; total-energy trigger; transistor-transistor logic; Architecture; Educational institutions; Electrons; Fastbus; Laboratories; Mesons; Poles and towers; Programmable control; Programmable logic arrays; Programmable logic devices;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/23.34465

Filename

34465