Difference between revisions of "New HVB"
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<br>Cosmics with premixed 50/50 Ar/CO<sub>2</sub>, New preamp and new HVB, ADC half-range<br> | <br>Cosmics with premixed 50/50 Ar/CO<sub>2</sub>, New preamp and new HVB, ADC half-range<br> | ||
| − | Left: 2000V; Right: 2050V | + | NB expanded x-axis, zoomed to 1000ch from 4096. |
| − | + | Left: 2000V; Right: 2050V; Far Right: 1950V (too low for software threshold of ped_mean+5sigma)<br> | |
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[[Image:newHVB_cosmics_amp_2050V.jpg|thumb|400px|New preamp and HVB - max amplitude histo for cosmics at 2050V ]] | [[Image:newHVB_cosmics_amp_2050V.jpg|thumb|400px|New preamp and HVB - max amplitude histo for cosmics at 2050V ]] | ||
| + | |width="400pt"| | ||
| + | [[Image:newHVB_cosmics_amp_1950V.jpg|thumb|400px|New preamp and HVB - max amplitude histo for cosmics at 1950V ]] | ||
| + | |||
|} | |} | ||
| + | <br>Fe55 with premixed 50/50 Ar/CO<sub>2</sub>, New preamp and new HVB, ADC half-range, for a range of HV<br> | ||
| + | Left: max amplitude histogram; Right: energy<br> | ||
| + | Mean pedestal is around 455ch, this has been subtracted from the amplitude histogram so at 2200V it is the fADC saturating rather than the preamp. | ||
| + | {| border="0" cellpadding="2" | ||
| + | |width="400pt"| | ||
| + | [[Image:newHVB_Fe55_amp.jpg|thumb|400px|New preamp and HVB - max amplitude histo for 55Fe ]] | ||
| + | |width="400pt"| | ||
| + | [[Image:newHVB_Fe55_e.jpg|thumb|400px|New preamp and HVB - energy histo for 55Fe ]] | ||
| + | |} | ||
| + | Re-analysed with shorter integration time (100ns, prev 160ns), improved pedestal subtraction, and new 2200V run with lower pedestal | ||
| + | {| border="0" cellpadding="2" | ||
| + | |width="400pt"| | ||
| + | [[Image:newHVB_Fe55_amp_2.png|thumb|400px|New preamp and HVB - max amplitude histo for 55Fe ]] | ||
| + | |width="400pt"| | ||
| + | [[Image:newHVB_Fe55_e_2.png|thumb|400px|New preamp and HVB - energy histo for 55Fe ]] | ||
| + | |} | ||
| + | The beginnings of a new HV efficiency plot | ||
| + | {| border="0" cellpadding="2" | ||
| + | |width="400pt"| | ||
| + | [[Image:newHVB_eff_HV.gif|thumb|400px|New preamp and HVB - tracked/triggers with HV for software threshold=5]] | ||
| + | |} | ||
Scope traces for premixed 50/50 Ar/CO<sub>2</sub> | Scope traces for premixed 50/50 Ar/CO<sub>2</sub> | ||
| + | {| border="0" cellpadding="2" | ||
| + | |width="400pt"| | ||
| + | [[Image:newHVB_Fe55_2100V_30s.jpg|thumb|400px|Fe55 at 2100V (50mV/div 100ns/div)]] | ||
| + | |width="400pt"| | ||
| + | [[Image:newHVB_cosmics_2100V_30s.jpg|thumb|400px|Cosmics at 2100V (50mV/div 100ns/div)]] | ||
| + | |} | ||
| + | older pics below (trigger was too high) | ||
{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
|width="400pt"| | |width="400pt"| | ||
Latest revision as of 22:17, 8 October 2010
Max amplitude histograms for
cosmics at 2100V with 50/50 Ar/CO2
Left: new preamp and new HVB, ADC half-range; right: old preamp and HVB, ADC full-range
Purple: untracked, blue: tracked (less of this with old preamp because of 2 dead central channels)
Cosmics with premixed 50/50 Ar/CO2, New preamp and new HVB, ADC half-range
NB expanded x-axis, zoomed to 1000ch from 4096.
Left: 2000V; Right: 2050V; Far Right: 1950V (too low for software threshold of ped_mean+5sigma)
Fe55 with premixed 50/50 Ar/CO2, New preamp and new HVB, ADC half-range, for a range of HV
Left: max amplitude histogram; Right: energy
Mean pedestal is around 455ch, this has been subtracted from the amplitude histogram so at 2200V it is the fADC saturating rather than the preamp.
Re-analysed with shorter integration time (100ns, prev 160ns), improved pedestal subtraction, and new 2200V run with lower pedestal
The beginnings of a new HV efficiency plot
Scope traces for premixed 50/50 Ar/CO2
older pics below (trigger was too high)
