Newest preamp

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  • 50/50 mixed Ar, CO2
  • Recalibrated MFCs
  • Outer plenum added to CDC prototype to prevent leaks
  • New modified HVB
  • 2050V
  • Comparison of modified preamp (preamp4 with terminating resistors removed) and its predecessor (preamp4)

Below: cosmics with newest modified preamp (left) and preamp4 (right) Blue histograms are tracked hits.

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



Below: 55Fe spectra with preamp 4 and Struck ADCs set to half-range, 550mV

Max amplitude histo, 55Fe, 2050V, Struck fADC range 550mV
Max amplitude histo (x-axis expanded), 55Fe, 2050V, Struck fADC range 550mV
Integrated, 96ns, 55Fe, 2050V, Struck fADC range 550mV

Below: 55Fe spectra with newest preamp (preamp4 minus terminating resistors) and Struck ADCs set to full-range, 1.1V

Max amplitude histo, 55Fe, 2050V, Struck fADC range 1.1V
Max amplitude histo (x-axis expanded), 55Fe, 2050V, Struck fADC range 1.1V
Integrated, 96ns, 55Fe, 2050V, Struck fADC range 1.1V
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