Difference between revisions of "Newest preamp"

Revision as of 10:03, 20 April 2011

• 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 new fADC, preamp4 (top) and newest modified preamp (below). Blue histograms are tracked hits, runtimes were not equal. The fADC range is 0-4096. These are histograms of the first maximum in ADC value for each event, pedestal has been subtracted, maximum must be above threshold. Threshold is pedestal mean + 5sigma. Pedestal mean was approx 100, sigma is 9-12.

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

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, modified preamp, mixed 50/50 at 60 sccm 2050V

Below: threshold pedestal mean + 4sigma

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

Earlier new fADC results are on this page: New_fADC_with_cosmics

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