CDC prototype drift times
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CDC prototype cosmics data
- 50/50 mixed Ar, CO2
- Recalibrated MFCs
- Outer plenum added to CDC prototype to prevent leaks
- New pre-production HVB
- 2100V
- Modified preamp4 (terminating resistors removed)
- Prototype tilted at 30o to enclosing scintillators (scints trigger the daq)
- New timing setup (recording coinc logic signal)
Purple histogram is drift time in tracks through each straw; gray selects tracks through all 3 straws in same column, hit threshold is 5sigma over pedestal
hit threshold is 10sigma over pedestal
Below: Purple:all tracks through straw, grey: track angle 5° or more to vertical, light blue: track angle less than 5° to vertical. Hit threshold 5 sigma over pedestal
Same again just for straw 17
Fitted drift distance for straw 17, for all tracks, and tracks through all 3 straws in the same vertical column, hit threshold 5sigma (left) and 10sigma (right)
Same again with more bins
Trigger signal (derived from coinc unit)