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Radiation hardness test of PD’s and APD’s, Energy resolution of CsI/PD and CsI/APD. ACCULINNA Group, FLNR JINR, Dubna Russia (http://aculina.jinr.ru) & Lund University, Sweden. Si PIN characteristics : Face size – 10.5 by 11.5 mm 10 by 10 mm Resistance – 8 k W 4 k W

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acculinna group flnr jinr dubna russia http aculina jinr ru lund university sweden

Radiation hardness test of PD’s and APD’s,

Energy resolution of CsI/PD and CsI/APD

ACCULINNA Group, FLNR JINR, Dubna Russia (http://aculina.jinr.ru)&Lund University, Sweden

Si PIN characteristics :

Face size – 10.5 by 11.5 mm 10 by 10 mm

Resistance – 8 kW 4 kW

Front layer materials: RTV, Epotex301, Bicron, Naked

Radiation flux:

Light charged particles (E=1-25 AMeV) 2×1010 1/cm2

Fast and slow neutrons 5×1011 1/cm2

slide2

earlier warning on effectiveness of full energy deposition for CsI

Test of CsI detection response for 179 MeV tritons

2 Si strip 61x61x1mm3 detectors followed by 25x25x50mm3 CsI

dark current values na of pd s and e e of csi pd s after an integrated flux of 2 10 10 lcp cm 2
Conditions:

Iinitial (U=50V) = 2-3 nA

DE/E=2.5% (5.8 MeV)

Air, T = 22o 1o C

Intensity: <104 pps/cm2

Time: ~ 60 days

Dark current values (nA) of PD’s and ΔE/E (%) of CsI/PD’safter an integrated flux of ~2×1010 LCP/cm2
energy resolution after radiation 2 10 10 lcp cm2 e 1 mm si vs eloss csi pd plots
Beam components:

8He (99%) & 3H (1%)

Dimension – 25 mm

on a D2 gas target

Energy resolution after radiation (2×1010 LCP/cm2)ΔE (1 mm Si) vs. Eloss (CsI/PD) plots
effect of irradiation by fast neutrons 5 days after flux 5 10 11 n cm 2 at acculinna f2
Effect of irradiation by fast neutrons, 5 days after(Flux ~ 5×1011 n/cm2 at ACCULINNA - F2)

few hours after irradiation

slide7

From literature:

Increase of the dark current of APD’s during irradiation with 70 MeV proton beam of PSI (top) and 90 MeV protons at KVI (bottom)

Prop. CMS PANDA-EMC

APD’s S8148 S8664-1010

Area 5x5 mm2 10x10 mm2

Idark 5 nA 10 nA

Cterm 80 pF 270 pF

(according to authors the beam rate of 9×1012 protons/cm2 is equivalent to 2×1013 of 1 MeV neutrons/cm2)

Jump of Idark (510 nA  4 μmA) takes place after an integrated flux of 5×1011 neutron/cm2

PSI

That could be dangerous for low energy gamma spectroscopy!

KVI

slide8

Comparison of CsI/APD and CsI/PD energy resolution Eγ=0.66 MeV ΔE/E=5.8% ΔE/E=12.0% Eγ=1.33 MeV ΔE/E=4.8% ΔE/E=7.1%

conclusions
Conclusions

1H

  • For single CsI there is a large loss of events of full energy deposition for high proton energy (E > 200 MeV).
  • DE-E method for LCP identification will be ambiguous with increasing energy.
  • High energy γ will fire several CsI crystals. How to reconstruct from the neighbouring crystals (5-10?) the total energywith a good enough resolution ~3-5% ?
  • Low energy γ spectroscopy will suffer from radiation damage of PD/APD and crystals activation.
  • A simulation of a neutron field is desirable to estimate deterioration of energy resolution caused by the radiation.

γ

Has each crystal its specific light-energy relation and has be calibrated individually by LCP and/or γ ?