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CERN group contribution to ENVISION WP2

CERN group contribution to ENVISION WP2. E. Auffray, P. Lecoq. The research leading to these results has received funding from the European Union’s Seventh Framework Programme (FP7 / 2007-2013) under Grant Agreements N ° 256984 ( EndoTOFPET ) and N ° 241851 (Envision)

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CERN group contribution to ENVISION WP2

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  1. CERN group contributionto ENVISION WP2 E. Auffray, P. Lecoq The research leading to these results has received funding from the European Union’s Seventh Framework Programme (FP7 / 2007-2013) under Grant Agreements N° 256984 (EndoTOFPET) and N° 241851 (Envision) This work was also carried out in the frame of the Crystal Clear Collaboration.

  2. Introduction • CERN group involved in PET activities in the frame of: • Crystal Clear Collaboration • EndoTOFPET-US • PICOSEC McNet • Envision • Entervision • ERC TICAL (from 01-02-2014) • Main hardware activities • Inorganic scintillators • Optimization of light transport and light collection (eg photonic crystals) • Photo detectors • Module integration • Aim : Improvement of the full detector chain: Scintillator, Photo detector, Electronics CERN_EnvisionWP2, Dec2013

  3. Coincidence time resolution measurement setup Setup 2010-2011 Optimization of threshold and bias voltage Time over threshold method • Best resolution obtained with: • Threshold: 100mV, • Bias: 72.4V • coincidence between 2 Proteus LSO 2x2x10mm, poor LY:20’000ph/MeV SiPM and electronics (NINO Chip) integrated on one board. • MPPC Hamamatsu 3x3mm2 (S10931-050P) • Best results with SPAD-size of 50μm x 50μm • Fill factor 61.5% • No. of SPADS : 3600 (S. Gundacker et al, IEEE transactions on nuclear science,Vol. 59 , N°5(2012) pp1798 – 1804 ) CERN_EnvisionWP2, Dec2013

  4. First comparisonbetween LYSOand Lu garnetfamilies (similar LY) 2010-2011 • Best resultswith LYSO • LuAG:Prisfast but poor SiPM photo-detectionefficiency (PDE) in UV; • LuAG:Ce’sdecay time istoo slow. CERN_EnvisionWP2, Dec2013

  5. Systematicstudy on L(YG)SO crystals 2011 CERN_EnvisionWP2, Dec2013

  6. Results for 10mm long crystals 2011 • Wrapping: Teflon • Readout: photodetectorswithopticalgrease Readout for CTR: SiPM Hamamatsu MPPC S10931-050P (50µm2) + NINO Readout for LY and decay time: Photonis PMT XP2020Q withCAEN digitizer (LY), digital oscilloscope Lecroy (decay time) (E. Auffray et al, IEEE transactions on nuclear science,Vol. 60 , N°5(2013) pp 3163 – 3164 ) CERN_EnvisionWP2, Dec2013

  7. Correlationbetween LY and CTR For samples 2* 2*Lmm3with L varyingfrom 4.5mm to 20mm 2011 Slope describes the overall PDE of the photo detection system. Good correlationbetween LY (measuredwith PMT) and No. of detectedphotoelectronsinferredfrom the coincidence time resolutionmeasurementassuming Poisson contribution only (E. Auffray et al, IEEE transactions on nuclear science,Vol. 60 , N°5(2013) pp 3163 – 3164 ) CERN_EnvisionWP2, Dec2013

  8. Influence of crystalwrapping 2011 Lateral Top photodetector Lateral (E. Auffray et al, IEEE transactions on nuclear science,Vol. 60 , N°5(2013) pp 3163 – 3164 ) CERN_EnvisionWP2, Dec2013

  9. Towards a simple demonstrator 2012 Pixel Proteus 3.2*3.2*15mm3 Wrappedwithteflon Pixel Proteus 3.2*3.2*15mm3 Wrappedwithteflon CTR : 235ps (E. Auffray et al, conference record of Nuclear Science Symposium and Medical Imaging IEEE 2012, pp3236 - 3240) CERN_EnvisionWP2, Dec2013

  10. New bench to characterise the timing performances of Xtal matrices 2012 Crystal Matrix Na 22 source Reference crystal Nino Board XY motors CERN_EnvisionWP2, Dec2013

  11. Newsilicon through via(TSV) MPPC Hamamatsu MPPC array S11827-344MG (“old Monolithic) 2013 3344-TSV Discrete 3344-TSV Monolithic CERN_EnvisionWP2, Dec2013

  12. Comparison Timing performance 2013 We have tested three read out configurations: (1) A fully single-ended read out 3.1x3.1x15 mm3 crystal matrix from Proteus coupled to the monolithic MPPC in coincidence with reference MPPC coupled to the 2x2x10 mm3 single crystal (2) A partial differential readout 3.1x3.1x15 mm3 crystal matrix from CPI coupled to the TSV monolithic MPPC in coincidence with reference MPPC coupled to the 2x2x10 mm3 single crystal (3) A fully differential read out 3.4x3.4x15 mm3 crystal matrix from CPI in coincidence with reference MPPC coupled to the 2x2x10 mm3 single crystal K. Doroud, CERN, EndoTOFPET 12

  13. TSVMonolithic/Discrete • Monolithic array has a common cathode only single ended readout is possible • => Electronic crosstalk. • Noise in the ground that limited the setting of the threshold low enough to trigger at the level of 1 pe. • Discrete array: each channel has its own anode and cathode differential read-out possible 2013 CTR of 3.1 x 3.1 x 15 mm3 mounted on the monolithic and Discrete MPPC K. Doroud Better CTR with Discrete array SPTR for discrete array are independent of the number of channels On Discrete MPPC array has been selected for ourEndoTOFPET-Us project the dead space between each MPPC cell (0.6 mm) => Crystal size of 3.5x3.5x15 mm3 CERN_EnvisionWP2, Dec2013

  14. Crystal matrices for EndoTOFPET 2013 256 crystals matrices: 3.5*3.5*15mm3 Average LY: 32700ph/MeV CERN_EnvisionWP2, Dec2013

  15. Timing performance 2013 CERN_EnvisionWP2, Dec2013

  16. Timing performance 2013 Up to now 70 modules glued: Mean value CTR 240ps (FWHM) CERN_EnvisionWP2, Dec2013

  17. Conclusion • The best timing resolution is achieved with LSO:Ce,0.4%Ca • LYSO:Ce with > 32’oooph/MeV gives almost similar results • Differential readout provides the necessary robustness and immunity to common noise, which is essential to maintain the timing resolution at the system level • A consistent coincidence timing resolution of 240ps FWHM has been obtained on a large set of 4x4 matrix pairs made of 3.5*3.5*15mm3 LYSO crystals CERN_EnvisionWP2, Dec2013

  18. Spareslides CERN_EnvisionWP2, Dec2013

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