Preamp 4: Comparison of 55Fe data with original preamp

The pictures below show ADC amplitude and energy histograms for 55Fe data with 50/50 Ar/CO2 gas mixture (the maximum ADC amplitude for each event contributes one entry for that amplitude in the histogram; the energy spectra were obtained by integrating the event amplitude after pedestal subtraction).

These compare data taken using the old and new preamps - the "old" preamp is the original one and the "new" preamp is Preamp4, described in Table 2 row 2 of GlueX-doc-1364 and labelled 27.

Amplitude

1900V

amplitude: old preamp, 55Fe, 50/50 Ar/CO2, 1900V

amplitude: new preamp, 55Fe, 50/50 Ar/CO2, 1900V

1950V

amplitude: old preamp, 55Fe, 50/50 Ar/CO2, 1950V

amplitude: new preamp, 55Fe, 50/50 Ar/CO2, 1950V

2000V

amplitude: old preamp, 55Fe, 50/50 Ar/CO2, 2000V

amplitude: new preamp, 55Fe, 50/50 Ar/CO2, 2000V

2500V

File:Fe amplitude 2500V old preamp.jpg amplitude: old preamp, 55Fe, 50/50 Ar/CO2, 2500V

File:Fe amplitude 2500V preamp4.jpg amplitude: new preamp, 55Fe, 50/50 Ar/CO2, 2500V

Energy

1900V

energy: old preamp, 55Fe, 50/50 Ar/CO2, 1900V

energy: new preamp, 55Fe, 50/50 Ar/CO2, 1900V

1950V

energy: old preamp, 55Fe, 50/50 Ar/CO2, 1950V

energy: new preamp, 55Fe, 50/50 Ar/CO2, 1950V

2000V

energy: old preamp, 55Fe, 50/50 Ar/CO2, 2000V

energy: new preamp, 55Fe, 50/50 Ar/CO2, 2000V

2500V

File:Fe energy 2500V old preamp.jpg energy: old preamp, 55Fe, 50/50 Ar/CO2, 2500V

File:Fe energy 2500V preamp4.jpg energy: new preamp, 55Fe, 50/50 Ar/CO2, 2500V