fpix0 electronic test marina artuso paul gelling jianchun wang the system works fine with charge...
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FPIX0 Electronic TestMarina ArtusoPaul Gelling
Jianchun Wang
The system works fine with charge injection calibration
Gain curve, threshold, and noise calibration
Americium source calibration
04/18/01 Jianchun (JC) Wang 3
Gain Curve Calibration
Scan step
1mV ~ 31.25 e
High Gain Cell
Normal Gain Cell
04/18/01 Jianchun (JC) Wang 4
Efficiency curve around threshold can used to measure both noise and threshold
Attenuation factor: 0.31826
04/18/01 Jianchun (JC) Wang 7
Calibration with X-ray Source
Americium-241:60 KeV
(35.7%)
Peak expected: Q ~ 60 / 3.6 = 16.7 Ke
Charge – ADC curve from pulse calibration applied Qcluster (Ke)
Num
ber
of C
lust
ers
60 KeV peak
04/18/01 Jianchun (JC) Wang 8
Am-241 with Al Filter
Qcluster (Ke)
Num
ber
of C
lust
ers
9 mm (later 4 mm) Al filter used
lower energy peak is suppressed
04/18/01 Jianchun (JC) Wang 9
Relative Scale Calibration
Col 1 Row 1 Col 5 Row 11
Qcluster (Ke)
Num
ber
of C
lust
ers
220,000 Clusters recorded for 11 63 cells
04/18/01 Jianchun (JC) Wang 10
Peak Position Distribution
Column
Row
Peak Position (Ke)N
umbe
r of
Cel
ls
04/18/01 Jianchun (JC) Wang 11
Scale Correction
Corrected Charge (Ke)
Num
ber
of C
lust
ers
Single Point (60KeV) Calibration
Scale Factor only