CDC old preamp then and now

The pictures below show ADC amplitude histograms for tracked and untracked cosmic ray data with 50/50 Ar/CO2 gas mixture (the maximum ADC amplitude for each event contributes one entry for that amplitude in the histogram) and energy spectra obtained by integrating the amplitude histograms.

2050V - cosmics - amplitude, old preamp, 2009 (left) and 2010 (right)

old preamp, cosmics, 50/50 Ar/CO2, 1950V

new preamp, cosmics, 50/50 Ar/CO2, 1950V, ADC half-range

1950V - cosmics - energy, old preamp (left) and new preamp (right) - ADC range is halved for new preamp

old preamp, cosmics, 50/50 Ar/CO2, 1950V

new preamp, cosmics, 50/50 Ar/CO2, 1950V, ADC half-range

Old preamp, n=10

old preamp, cosmics, 50/50 Ar/CO2, 1950V

old preamp, cosmics, 50/50 Ar/CO2, 1950V, 45 degrees

Old preamp (flat), 2050V, software threshold n=10, newer data

old preamp, cosmics, 50/50 Ar/CO2, 2050V, n=10, 30726

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2050V - cosmics - amplitude, old preamp, 2009 (left) and 2010 (right)

old preamp, cosmics, 50/50 Ar/CO2, 2050V

old preamp, cosmics, 50/50 Ar/CO2, 2050V, n=10, 30726

2050V - cosmics - energy, old preamp (left) and new preamp (right)

old preamp, cosmics, 50/50 Ar/CO2, 2050V

old preamp, cosmics, 50/50 Ar/CO2, 2050V, n=10, 30726 |}