CDC signal integration

50/50 gas, 2100V

• • • • Caveat: data were with preamp underpowered, 2.65V on preamp card ****

1. CDC Update
   1. Construction Update
      File:Ccinsects1.jpg

      x50px
      File:Ccinsects1.jpg

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   2. Cosmic Calibration of the Chamber

Try to calculate dE/dx

integration from low threshold crossing for next 700ns / track length

No tilt

Tilted at 45 degrees

This does not scale very nicely with track length.

Track length is calculated in the plane parallel to the endplates (no z information) so I scaled it by the tilt of the prototype for the 45 degree data, the upper cosmic trigger scintillator is high up enough that the cosmics are ~ vertical

height of first maximum in signal amplitude / track length

No tilt

Tilted at 45 degrees

signal integrated from low threshold crossing to position of first maximum in signal amplitude / track length

No tilt

Tilted at 45 degrees

Look at time over threshold...

Peak duration is # samples after the lower threshold crossing until the ADC value decreases by 2sigma over 2 samples, this is a measure of time over threshold in units of 8ns

Peak duration

No tilt

Tilted at 45 degrees

Peak duration / track length

No tilt

Tilted at 45 degrees

Peak duration vs track length

No tilt

Tilted at 45 degrees

Peak length vs first maximum in signal amplitude

No tilt

Tilted at 45 degrees