M. Friedl, H. Pernegger
Phobos Spectrometer Module Tests
Phobos Collaboration Meeting
BNL, Apr 16-18, 1999
Contents
Introduction Back to contents
1 or 2 hybrid(s) + 2 to 4 sensors = 1 module
Assembly of Phobos Spectrometer finished
(42 installed modules)
Calibration and Source Test Back to contents
Measured data is filled into the Assembly Database (accessible via Phobos Web pages)
Calibration Details Back to contents
Module Studies Back to contents
MP = 21523 e- = 77.9 keV
SNR = 16.4
Uniformity better than 1% pp !!!
Signal Back to contents
Noise Back to contents
Single channel physical connections
Single channel preamp noise model
symbol |
represents |
typ. value |
ILeak |
Fraction of sensor leakage current |
5 nA |
RP |
Parallel resistance (polysilicon) |
2 M W |
C |
Capacitance of pad against backplane, between pads and between metal 1 and metal 2 layers |
25 pF |
RS |
Effective serial trace resistance |
40 W |
TP |
Shaper peaking time |
1.2 ms |
ENCC |
Preamp noise (k + C · d) |
950+5/pF e- |
with ENC [e-], k [e-], d [e-/pF],
ILeak [nA], TP [
ENCC = |
1078 |
e- |
ENCILeak = |
249 |
e- |
ENCRP = |
562 |
e- |
ENCRS = |
60 |
e- |
ENC = |
1243 |
e- |
Signal-to-Noise Back to contents
Summary Back to contents
The sensor properties: