In the scope of the COMPASS experiment a multi-purpose, high rate capable TDC with digitisation width of 60 ps has been developed. The integration into the readout system and the flexible input of the CATCH readout driver is presented.Key words: TDC; readout driver; front-end electronics; VMEThe COMPASS experiment at CERN will investigate the hadron structure by deep inelastic muon scattering and hadronic production processes. One central issue of the experimental effort will be the measurement of the contribution of gluons to the nucleon spin. To reach this objective a demanding stateof-the-art double-stage spectrometer with large geometrical and dynamical acceptance is being set-up and commissioned through the year 2000.
The JETSET (PS202) experiment at CERN{LEAR searches for hadronic resonances by means of in-ight a n tiproton{proton annihilations in the reaction pp . In order to obtain sucient luminosity and good nal-state mass resolution, this experiment uses an internal hydrogen-cluster jet target intersecting the LEAR antiproton beam. We report on the study of the reaction pp 4K at 1.4 GeV/c incident p momentum, and we present the rst experimental observation of a strong signal in this reaction.
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