Development of the calorimeter trigger for the ZEUS detector

Technical Report · Fri Jan 01 04:00:00 EST 1988

OSTI ID:6400762

Smith, W H

The purpose of this research was to begin development of the trigger for the calorimeter of the ZEUS detector at HERA, a new storage ring that will provide collisions between 820 GeV protons and 30 GeV electrons by 1990. The calorimeter will be made of depleted uranium plates and plastic scintillator read out by wavelength shifter bars into 12,000 photomultiplier tubes. These signals will be combined into 1000 towers with separate electromagnetic and hadronic sums. The calorimeter first level trigger will be pipelined with a decision provided 5 ..mu..sec after each beam crossing, occurring every 96 nsec. The trigger will need to determine the total energy, the total transverse energy, the missing energy, and the energy and number of jets and isolated electrons. The trigger rate needs to be held to 1 kHz against a rate of proton-beam gas interactions of 200 kHz. The summed pulseheights will be digitized by 8-bit flash ADC's. They will be linearized, stored and manipulated digitally. The various pipelined sums will be made using ECL and CMOS technology.This grant was used to investigate these technologies, model the trigger performance, and begin the design. This research will be continued by this principal investigator under another DOE grant at the University of Wisconsin.

• Research Organization: Columbia Univ., New York (USA)
• DOE Contract Number: AC02-87ER40369
• OSTI ID: 6400762
• Report Number(s): DOE/ER/40369-1; ON: DE89006491
• Country of Publication: United States
• Language: English

Related Subjects

440104* -- Radiation Instrumentation-- High Energy Physics Instrumentation
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
BARYONS
DESIGN
ELECTRONIC CIRCUITS
ELEMENTARY PARTICLES
FERMIONS
FUNCTIONS
HADRONS
HERA STORAGE RING
MEASURING INSTRUMENTS
NUCLEONS
PHOSPHORS
PLASTIC SCINTILLATORS
PULSE CIRCUITS
RADIATION DETECTORS
SHOWER COUNTERS
STORAGE RINGS
STRUCTURE FUNCTIONS
TRIGGER CIRCUITS