1. TAPS October 2004 TAPS Status  Martin Kotulla, University Basel

2. TAPS Setup Martin Kotulla, Universität Basel BaF 2 Detectors/Electronics:  all 510 detectors are working  during production run ~507 channels operating  NTEC board and trigger very reliable  problem of setting up CFD some channels show an increasing threshold with time (dying)  CFD threshold little higher than expected (~3 MeV)  operation very unproblematic DAQ (performance):  TAPS daq very reliable and fast  combined daq: works fine ~1 syncronization loss / day easy to notice and recover

3. TAPS CFD Status SPS 2004 Martin Kotulla, Universität Basel

4. CB-TAPS Invariant mass SPS 2004 Martin Kotulla, Universität Basel

5. TIME I Martin Kotulla, Universität Basel TAPS Time Difference:   0 decay photons, all 510 detectors  „online“ resolution: FWHM < 1.2 ns

6. TIME II Martin Kotulla, Universität Basel TAPS proton signature:  time difference TAGGER - TAPS   0 p kinematics, E vs TOT plot to identify protons in TAPS

7. TAPS Veto SPS 2004 Martin Kotulla, Universität Basel TAPS Veto detectors:  have been in checked/repaired in Giessen after ELSA period  operated with common gate (500ns) no ADC/TDC available  thresholds have been individually determined (H.Loehner and S. Shende)  Veto detectors not used in 1. Experiment  0 threshold  thresholds have been lowered and HV increased  1. Operation during MDM beamtime   0 p kinematics to check proton efficiency  „preliminary“ average p efficiency ~80 %  improvement?

8. Summary/Status SPS 2004 Martin Kotulla, Universität Basel Upcoming Runs / Future:  need to take care of maximum single crystal rate rare  decays (factor 2-3 higher flux) solid target runs (much higher background from pair production...) 1. Ring 1.0-2.9° 2. Ring2.9-4.9°  will try to improve on veto efficiency  need to solve CFD setup

9. SPS 2004 Martin Kotulla, Universität Basel