Fast asynchronous level 1 pre-trigger for electrons at L = 10/sup 33/cm/sup -2/sec/sup -1/

Conference · Sat Jan 01 04:00:00 EST 1983

OSTI ID:6308950

Tannenbaum, M J

Asynchronous Triggers have long been used at fixed target accelerators and the CW High Luminosity CERN ISR. Bunched beam colliders have tended to use triggers which were synchronized with the time of the beam crossing. The CDF trigger scheme has 3.5 ..mu..sec between such crossings to decide whether to further process any events which occurred during the crossing. The level 1 trigger can accept a rate of 50 KHz without appreciable dead time. The level 2 trigger uses fast bit-slice processors to select event topologies in 10 ..mu..sec and thus can accept a trigger rate of 5 KHz. Readout of the system which takes 1/2 msec is required for level 3, thus limiting the triggering rate at level 3 to approx. 100 Hz. The purpose of this note is to show that this same trigger scheme would work at a CW luminosity of 10/sup 33/cm/sup -2/sec/sup -1/ by the addition of a conventional hard-wired asynchronous pre-trigger.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6308950
• Report Number(s): BNL-32843; CONF-830224-9; ON: DE83011361
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430303* -- Particle Accelerators-- Experimental Facilities & Equipment
440104 -- Radiation Instrumentation-- High Energy Physics Instrumentation
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ACCELERATOR FACILITIES
BEAMS
CERN ISR
COLLIDING BEAMS
ELECTRONIC CIRCUITS
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
HADRON-HADRON INTERACTIONS
INTERACTIONS
LEPTONS
LUMINOSITY
MEASURING INSTRUMENTS
OPTICAL PROPERTIES
PARTICLE INTERACTIONS
PHYSICAL PROPERTIES
PULSE CIRCUITS
RADIATION DETECTORS
SHOWER COUNTERS
STORAGE RINGS
TRIGGER CIRCUITS