Bochum 1998 – scientific programme
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HK: Hadronen und Kerne
HK 56: Postersitzung
HK 56.65: Poster
Wednesday, March 18, 1998, 17:00–19:00, Foyer
Development of a fast tracking trigger for the Kaon Spectrometer at SIS (GSI)[*] — •M. Menzel1, I.M. Böttcher1, B. Kohlmeyer1, J. Speer1, F. Pühlhofer1, and KaoS Kollaboration 2 — 1Univ. Marburg — 2GSI Darmstadt, TH Darmstadt, Univ. Marburg, Univ. Frankfurt, Univ. Kraków
The Kaon Spectrometer at the SIS [1] was designed to identify subthreshold kaons in the presence of a high background of pions and protons (1:104:105). Two plastic scintillator arrays, one between the quadrupole and the dipole magnet and the other one in the focal plane, serve as a 1st-level time-of-flight trigger. With a new scintillator array behind the focal plane this arrangement allows a fast tracking trigger, which will online reduce scattered particles significantly.
A technique with fast lookup tables was introduced for a 2nd-level trigger to analyze the hit pattern of the three detector arrays and to compare it with a table of allowed tracks within 110 ns. An experiment with Ni beams, in which K− at low momenta were measured, yielded additional background suppression factors of the order of 8.
[1] P.Senger et al. NIM A327 (1993) 393
[*] supported by GSI