Realistic requirements from R 3 B program In-beam tests of Demonstrators (no TRD yet) Decisions on: Readout device, Forward cap detectors (Detector manufacturing program, Formulation of acceptance test) CALIFA LU DEMONSTRATOR ARRAY V. Avdeichikov, P. Golubev, B. Jakobsson, June 2008
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Realistic requirements from R 3 B program In-beam tests of Demonstrators (no TRD yet) Decisions on: Readout device, Forward cap detectors ( Detector.
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Realistic requirements from R3B program
In-beam tests of Demonstrators (no TRD yet)
Decisions on: Readout device, Forward cap detectors ( Detector manufacturing program, Formulation of acceptance test)
CALIFA LU DEMONSTRATOR ARRAY
V. Avdeichikov, P. Golubev, B. Jakobsson, June 2008
Readout of CsI(Tl) – photodiodes?
+ PDs do not need specific temperature or voltage stability precausions
What about resolution and threshold?
With existing PA/PD
significantly worse energy resolution
high threshold ~100 keV
Can the proper combination of PA and PD solve the problem?
black points: calculated, open (1.0 nA), closed (2.0 nA). red points: measured with PAs eV5091 and PHOS
The gamma energy resolution depends very much on the PD noise level.
A low-capacity (15 pF) PD with low current (< 1 nA) can give a resolution close to what an APD can provide.
We should order a PD with these parameters now if ......................
the R3B and/or EXL programmes or at least a substantial part of these programmes can live with a threshold of ~100 keV.