Architecture of the MEGA detector trigger

Y. K. Chen, M. D. Cooper, P. S. Cooper, M. Dzemidzic, C. A. Gagliardi, G. E. Hogan, E. V. Hungerford, G. J. Kim, J. E. Knott, K. J. Lan, F. Liu, B. W. Mayes, R. E. Mischke, R. Phelps, L. S. Pinsky, K. M. Stantz, J. J. Szymanski, L. G. Tang, R. E. Tribble, X. L. TuL. A. Van Ausdeln, W. Von Witsch, C. S. Wright

Research output: Contribution to journalArticle

5 Scopus citations


The trigger for the MEGA detector system is based on signals from single, high-energy photons interacting in one of the three MEGA pair spectrometers. The trigger is divided into a fast and a slow stage. The first stage produces a fast output if a specific pattern of detector hits is observed in the scintillators and high-speed wire chambers of a pair spectrometer. The second, slow-stage interrogates drift chamber hit patterns and provides a veto when the pattern fails a minimal requirement for reconstruction of the hits into a pair of circular orbits. The trigger interacts with the photon detector electronics by gating limited sections of the detector during the read-out of an event. This paper describes the two stage trigger system, the photon detector electronics, and the implementation of the trigger outputs to strobe the data acquisition system. The performance of the trigger is compared to Monte Carlo simulations of the photon detector response.

Original languageEnglish (US)
Pages (from-to)195-206
Number of pages12
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1-2
StatePublished - Mar 21 1996
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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    Chen, Y. K., Cooper, M. D., Cooper, P. S., Dzemidzic, M., Gagliardi, C. A., Hogan, G. E., Hungerford, E. V., Kim, G. J., Knott, J. E., Lan, K. J., Liu, F., Mayes, B. W., Mischke, R. E., Phelps, R., Pinsky, L. S., Stantz, K. M., Szymanski, J. J., Tang, L. G., Tribble, R. E., ... Wright, C. S. (1996). Architecture of the MEGA detector trigger. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 372(1-2), 195-206.