Difference between revisions of "Newest preamp"
From GlueXWiki
| Line 8: | Line 8: | ||
Below: cosmics with new fADC, preamp4 (top) and newest modified preamp (below). Blue histograms are tracked hits, runtimes were not equal. | 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. | + | 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. | Pedestal mean was approx 100, sigma is 9-12. | ||
| Line 22: | Line 22: | ||
[[Image:run_31646_thr5_amp6_unz.png|thumb|420px|Max amplitude histo for cosmics, new fADC, modified HVB, modified preamp, mixed 50/50 at 60 sccm 2050V]] | [[Image:run_31646_thr5_amp6_unz.png|thumb|420px|Max amplitude histo for cosmics, new fADC, modified HVB, modified preamp, mixed 50/50 at 60 sccm 2050V]] | ||
|} | |} | ||
| + | |||
| + | Below: threshold pedestal mean + 4sigma | ||
| + | {| border="0" cellpadding="2" | ||
| + | |width="420pt"| | ||
| + | [[Image:run_31646_thr4_amp6.png|thumb|420px|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]] | Earlier new fADC results are on this page: [[New_fADC_with_cosmics]] | ||
Revision as of 10:02, 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.
Below: threshold pedestal mean + 4sigma
|
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 Below: 55Fe spectra with newest preamp (preamp4 minus terminating resistors) and Struck ADCs set to full-range, 1.1V |
