a design study for a cobra upgrade to - Institut für Kern- und ...

60 5 Scintillator upgrade
three different PMTs, one PIN diode, one APD and two Si-PMT. The
implemented PMTs correspond to Hamamatsu R669 (borosilicate window,
extended red photocathode), R6094 (borosilicate window and
bialkali photocathode) and a R5900 with UV Glass and multialkali
photo cathode. The PIN diode is a 2x1 cm 2 S2744-08, the APD a S8664-
1010 (10x10 mm 2 ) and the Si-PMT correspond to S10985-050C (MPPC-
050C) with 6x6 mm 2 active area and four times 900 pixels and the
S10985-100C (MPPC-100C) with four times 3600 pixels.
Figure 5.2: Quantum efficiencies for photo absorption of various electronic
readouts in comparison to CsI:Tl emission spectrum [41].
In this application, the default geometry can be changed with messengers,
redefining the crystal size, the amount of placed readout devices
and the size of the readout devices. Also, optical properties, like
the housing finish of the crystal surface can be set to polished with
the parameter ID (1), polished-frontpainted (2), polished-backpainted
(3), ground (4), ground-frontpainted (5) and ground-backpainted (6).
Available quantum efficiencies are these of the PMT R669 (1), the PMT
R6094 (2), the APD (3), the MPPC-100C (4), the MPPC-050C (5), the PIN
diode (6) and the PMT R5900 (7). These parameters can be changed by
using these commands:
/CsI/detector/dimensions 20.00 5.00 5.00 cm
/CsI/detector/pmtRadius 2.5 mm
/CsI/detector/nx 0