CDC prototype drift times

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 30^o 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

drift times for all tracks and tracks in single column of straws, threshold 5 sigma

drift times for all tracks and tracks in single column of straws, threshold 10 sigma