CDC old preamp then and now

First cosmics and then Fe55. 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. Comparing old and new runs with the old preamp.

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 |}