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The ATLAS Level-1 Calorimeter Trigger

R Achenbach2, P Adragna4, V Andrei2, P Apostologlou5, B Åsman6, C Ay3, B M Barnett5, B Bauss3, M Bendel3, C Bohm6, J R A Booth1,5, I P Brawn5, P Bright Thomas1, D G Charlton1, N J Collins1, C J Curtis1, A Dahlhoff3, A O Davis5, S Eckweiler3, J P Edwards5, E Eisenhandler4, P J W Faulkner1, J Fleckner3, F Föhlisch2, J Garvey1, C N P Gee5, A R Gillman5, P Hanke2, R P Hatley5, S Hellman6, A Hidvégi6, S J Hillier1, K Jakobs3, M Johansen6, E -E Kluge2, M Landon4, V Lendermann2, J N Lilley1, K Mahboubi2, G Mahout1, A Mass2, K Meier2, T Moa6, E Moyse4, F Müller2, A Neusiedl3, C Nöding3, B Oltmann3, J M Pentney4, V J O Perera5, U Pfeiffer2, D P F Prieur5, W Qian5, D L Rees1, S Rieke3, F Rühr2, D P C Sankey5, U Schäfer3, K Schmitt2, H -C Schultz-Coulon2, C Schumacher2, S Silverstein6, R J Staley1, R Stamen2, M C Stockton1, S Tapprogge3, J P Thomas1, T Trefzger3, P M Watkins1, A Watson1, P Weber2 and E -E Woehrling1

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The ATLAS Level-1 Calorimeter Trigger uses reduced-granularity information from all the ATLAS calorimeters to search for high transverse-energy electrons, photons, τ leptons and jets, as well as high missing and total transverse energy. The calorimeter trigger electronics has a fixed latency of about 1 μs, using programmable custom-built digital electronics. This paper describes the Calorimeter Trigger hardware, as installed in the ATLAS electronics cavern.

Keywords

Digital electronic circuits

Trigger concepts and systems (hardware and software)

PACS

29.40.Vj Calorimeters

29.40.Gx Tracking and position-sensitive detectors

29.50.+v Computer interfaces

Subjects

Accelerators, beams and electromagnetism

Nuclear physics

Instrumentation and measurement

Particle physics and field theory

Dates

Issue 03 (March 2008)

Received 22 January 2008, accepted for publication 15 February 2008

Published 6 March 2008



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