Improved timing

• Work in progress - intended more as a logbook than presentation of results*

Results using Gerard's leading edge algo to extract drift-time from CDC prototype cosmics data

• 50/50 mixed Ar, CO₂
• Recalibrated MFCs
• Outer plenum added to CDC prototype to prevent leaks
• New pre-production HVB
• 2050V
• Modified preamp4 (terminating resistors removed)
• Prototype tilted at 30^o to enclosing scintillators (scints trigger the daq)

Fed scintillator signals post-discriminator and coincidence signal through then level converter to ECL, then attentuator, into fADC. Took threshold as half peak value (also tried 1/4 and 3/4 peak but these broadened the timing spectra). Used interpolation algo. (The DAQ is triggered by the coinc signal.)

Interpolated signals for many events (ADC value vs time)

Histogram of threshold crossing time

Histogram of threshold crossing time - coincidence time for scintillators and 2D plot