The DISTO first level trigger at SATURNE
F. Balestra, Y. Bedfer, Raimondo Pietro Bertini, L. C. Bland, A. Brenschede, F. Brochard, M.P. Bussa, S. Choi, M. Dȩbowski, Mario Džemidžić, J.C. Faivre, L. Fava, Livio Ferrero, J. Foryciarz, V. Frolov, Raffaello Garfagnini, D. R. Gill, A. Grasso, S. Heinz, W. W. Jacobs · IEEE Transactions on Nuclear Science · 1998
The DISTO collaboration has built a large-acceptance magnetic spectrometer designed to provide broad kinematic coverage of multi-particle final states produced in pp scattering. The spectrometer has been installed in the polarized proton beam of the Saturne accelerator in Saclay to study polarization observables in the p/spl I.oarr/p/spl rarr/pK/sup +/Y/spl I.oarr/ (Y=/spl Lambda/, /spl Sigma//sup 0/ or Y*) reaction and vector meson production (/spl phi/, /spl omega/, and /spl rho/) in pp collisions. The common signature of such events is the multiplicity of four charged particles in the final state. A flexible 1st level trigger which uses topological information from fast detectors (scintillating fibers and hodoscope) has been built. It is completely software programmable through a menu-driven user interface and allows switching between production and monitor triggers on successive beam spills.