New HVB

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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)

New preamp and HVB - max amplitude histo for cosmics at 2100V
Old preamp and HVB - max amplitude histo for cosmics at 2100V


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)

New preamp and HVB - max amplitude histo for cosmics at 2000V
New preamp and HVB - max amplitude histo for cosmics at 2050V
New preamp and HVB - max amplitude histo for cosmics at 1950V



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.

New preamp and HVB - max amplitude histo for 55Fe
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

New preamp and HVB - max amplitude histo for 55Fe
New preamp and HVB - energy histo for 55Fe

The beginnings of a new HV efficiency plot

New preamp and HVB - tracked/triggers with HV for software threshold=5

Scope traces for premixed 50/50 Ar/CO2

Fe55 at 2100V (50mV/div 100ns/div)
Cosmics at 2100V (50mV/div 100ns/div)

older pics below (trigger was too high)

Fe55 at 2100V (50mV/div 100ns/div)
Cosmics at 2100V (50mV/div 100ns/div)