View source for Preamp 4: Comparison of 55Fe data with original preamp at lower voltage

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).

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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.

<br>Amplitude - original (left) and new (right) preamps<br>


<br>

1900V
{| border="1" cellpadding="2"
|width="415pt"|[[Image:Fe_amplitude_1900V_old_preamp.jpg|thumb|none|400px|amplitude: old preamp, 55Fe, 50/50 Ar/CO2, 1900V]]
|width="415pt"|[[Image:Fe_amplitude_1900V_preamp4.jpg|thumb|none|400px|amplitude: new preamp, 55Fe, 50/50 Ar/CO2, 1900V]]
|}
<br>

1950V (this was shown earlier, the y axis scale is expanded)
{| border="1" cellpadding="2"
|width="415pt"|[[Image:Fe_amplitude_1950V_old_preamp_diff_yaxis.jpg|thumb|none|400px|amplitude: old preamp, 55Fe, 50/50 Ar/CO2, 1950V]]
|width="415pt"|[[Image:Fe_amplitude_1950V_preamp4.jpg|thumb|none|400px|amplitude: new preamp, 55Fe, 50/50 Ar/CO2, 1950V]]
|}

<br>Energy - original (left) and new (right) preamps<br>

1900V
{| border="1" cellpadding="2"
|width="415pt"|[[Image:Fe_energy_1900V_old_preamp.jpg|thumb|none|400px|energy: old preamp, 55Fe, 50/50 Ar/CO2, 1900V]]
|width="415pt"|[[Image:Fe_energy_1900V_preamp4.jpg|thumb|none|400px|energy: new preamp, 55Fe, 50/50 Ar/CO2, 1900V]]
|}

<br>

1950V
{| border="1" cellpadding="2"
|width="415pt"|[[Image:Fe_energy_1950V_old_preamp.jpg|thumb|none|400px|energy: old preamp, 55Fe, 50/50 Ar/CO2, 1950V]]
|width="415pt"|[[Image:Fe_energy_1950V_preamp4.jpg|thumb|none|400px|energy: new preamp, 55Fe, 50/50 Ar/CO2, 1950V]]
|}