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Work at IPN Orsay

R&D on Calorimeters

Jean PeyréSept 2007

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1:Temperature dependanceMichaël JOSSELIN

Gain vs Temperature Reference article

XP2020 Photomultiplier -0.1%/°C below 20°C-0.4%/°C above 20°C

Temperature dependences of LaBr3(Ce), LaCI3(Ce) and NAI(Tl) scintillators.M.Moszynski, Nucl.Instr. And Methods in Physics Research A568(2006) p741.

CSI(Tl) Crystal326x19.9x26.7mmAmcrys

From -20 to 30°C+0.28%/°C

Performances of the CSI(Tl) detector element of the GLAST calorimeter.Ph. Bourgeois, Nucl.Instr. And Methods in Physics Research A518(2004) p18.

Photodiode metal-resistor-semiconductor

From 16 to 32°C-0.8%/°C-1.2%/°C

Scintillator counters with multi-pixel avalanche photodiode readout for ND280 detector of the T2K experiment.O. Mineev, Nucl.Instr. And Methods in Physics Research A577(2007) p544.

Hamamatsu HC APDHamamatsu LC APD

+2.3%/°C from 15 to 18°+2.5%/°C from 15 to 18°

Characterization of avalanche photodiodes for calorymetrie applications.A. Karar, Y. Musienko, J.Ch. Vanel, Nucl.Instr. And Methods in Physics Research A428(1999) p429.

Hamamatsu S5345W/-66KG5246 APD

At 25°C, Vbias=320, G=100+3.8%/°C

Readout of scintillator light with avalanche photodiodes for positron emission tomography.Ruru Chena, A. Fremout, S. Tavernier, P. Bruyndonckx, D. Clément, J.-F. Loude, C. Morel, Nucl.Instr. And Methods in Physics Research A428(1999) p429.

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1:Temperature dependanceMichaël JOSSELIN

CONCLUSION

Variation of Xtal+detector response at 20°C (according to NIm papers) • PMT + CsI(Tl) → +0.2 to 0.4%/°K• APD + CsI(Tl) → +2.3 to 3.8 %/°K

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2: R&D Status at IPNO

Prototypes for Calorimeter

Dual Square PMTs (1 per 2 crystals) received from

Photonis (1 PMT 9 stages and 1 PMT 11 stages)

Scionix has promised CsI(Tl) Crystals for the

end of september

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3: magnetic field R3B

Discussion with J.E. Ducret from CEA Saclay

Magnetic field along Z axis of Magnet

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3: magnetic field R3B

Discussion with J.E. Ducret from CEA Saclay

Magnetic field along Z axis of Magnet

218 Gauss at 900mm from point (0,0,0)

Conclusion: if use of PMT, need of shilding (to be studied)

(0,0,0)

z

x

Beam axis14°

Target

1450mm

R3B Calorimeter

2.2T Magnet

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r4:Non-Homogenity measurements

protocol

Proposition

1. Use of Charge PreAmplifier + shaper of peaking time of 3 μs

2. Feedback Capacitor Cf adapted to the gain of photodetector

3. Rf*CF >> shaping time

4. Rf >> 1 MΩ to minimize noise5. PreAmplifier Rise Time T=Cd/wc*Cf (be careful for

LaBr3+APD)

6. Measurements must be done in temperature controled room

Cd

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r4:Non-Homogenity measurements

protocol

« MESURES D’AMPLITUDESR. HERMEL (LAPP)Du détecteur à la mesureRoscoff juin 2003 »