TAPS October 2004

TAPS Status

Martin Kotulla, University Basel

TAPS Setup

Martin Kotulla, Universität Basel

BaF2 Detectors/Electronics: all 510 detectors are working

during production run~507 channels operating

NTEC boardand trigger very reliable

problem of setting up CFDsome channels show anincreasing threshold with time(dying)

CFD threshold little higherthan expected (~3 MeV)

operation very unproblematic

DAQ (performance): TAPS daq very reliable and fast

combined daq: works fine~1 syncronization loss / dayeasy to notice and recover

TAPS CFD Status

SPS 2004 Martin Kotulla, Universität Basel

CB-TAPS Invariant mass

SPS 2004 Martin Kotulla, Universität Basel

TIME I

Martin Kotulla, Universität Basel

TAPS Time Difference: 0 decay photons, all 510 detectors

„online“ resolution: FWHM < 1.2 ns

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

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?

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. Ring 2.9-4.9°

will try to improve on veto efficiency

need to solve CFD setup

SPS 2004 Martin Kotulla, Universität Basel

SPS 2004 Martin Kotulla, Universität Basel