New fADC with cosmics

• 50/50 mixed Ar, CO₂
• Recalibrated MFCs
• Outer plenum added to CDC prototype to prevent leaks
• New preamp
• New HVB

Software methods are mostly as described in [Yves's NIM paper] (start at page 9)

Below: Cosmics, 2050V, max amplitude histograms, new fADC with unmodified HVB (left), with modified HVB (attenuation x0.5 before the preamp input) (center) and Struck fADCs with modified HVB (right), same straw for each. The pedestal has been subtracted (this is around 100 for the new fADC, could go down to 50.) NB different x axis scales, full scale is 4096 for both ADCs.

Max amplitude histo for cosmics, new fADC, unmodified HVB, mixed 50/50 at 60 sccm 2050V

Max amplitude histo for cosmics, new fADC, modified HVB, mixed 50/50 at 60 sccm 2050V

Max amplitude histo for cosmics, Struck fADCs, modified HVB, mixed 50/50 at 60 sccm, 2050V

Below: Cosmics, 2050V, drift time - untracked, new fADC (left) and Struck fADCs (right), same straw for both.

New fADC cosmics drift time (untracked), mixed 50/50 at 60 sccm 2050V

Struck fADCs cosmics drift time (untracked), mixed 50/50 at 60 sccm, 2050V

Below: Cosmics, 2050V, drift radius fit residuals (radius of fitted track - radius interpolated from Garfield drift time calcs)
New fADC with unmodified HVB (left), with modified HVB (center) and Struck fADCs with modified HVB (right), same straw for each.

Drift radius fit residuals, new fADC, unmodified HVB, mixed 50/50 at 60 sccm 2050V

Drift radius fit residuals, new fADC, modified HVB, mixed 50/50 at 60 sccm 2050V

Drift radius fit residuals, Struck fADCs, modified HVB, mixed 50/50 at 60 sccm, 2050V

Below: Cosmics, 2050V, drift radius fit residuals with chosen straw omitted from fit
New fADC with unmodified HVB (left), with modified HVB (center) and Struck fADCs with modified HVB (right), same straw for each.

Drift radius fit residuals, new fADC, unmodified HVB, mixed 50/50 at 60 sccm 2050V

Drift radius fit residuals, new fADC, modified HVB, mixed 50/50 at 60 sccm 2050V

Drift radius fit residuals, Struck fADCs, modified HVB, mixed 50/50 at 60 sccm, 2050V

Below: Fits to drift radius fit residuals

Drift radius fit residuals, new fADC, unmodified HVB, mixed 50/50 at 60 sccm 2050V

Drift radius fit residuals, new fADC, modified HVB, mixed 50/50 at 60 sccm 2050V