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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 1^st-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 2^nd-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