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A dvanced GA mma T racking A rray

A dvanced GA mma T racking A rray. Performance of an AGATA prototype detector estimated by Compton-imaging techniques. Francesco Recchia INFN - Legnaro on behalf of the AGATA collaboration. The g -ray spectrometer AGATA. R int = 23 cm. Efficiency: 43% (M g =1) 28% (M g =30)

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A dvanced GA mma T racking A rray

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  1. AdvancedGAmmaTrackingArray Performance of an AGATA prototype detector estimated by Compton-imaging techniques Francesco RecchiaINFN - Legnaro on behalf of the AGATA collaboration

  2. The g-ray spectrometer AGATA Rint = 23 cm Efficiency: 43% (Mg=1) 28% (Mg=30) today’s arrays ~10% 5% Peak/Total: 58% (Mg=1) 49% (Mg=30) today ~55% 40% Angular Resolution: ~1º FWHM (1 MeV, v/c=50%) ~ 6 keV today ~40 keV Design values: 5 mm of position resolution assumed Rext = 32 cm 180 HPGe • 180 large volume 36-fold segmented Ge crystals packed in 60 triple-clusters • Digital electronics and sophisticated Pulse Shape Analysis algorithms • Operation of Ge detectors in position sensitive mode for g-ray tracking Triple cluster

  3. Ingredients of g-ray tracking Identified interaction points 4 1 (x,y,z,E)i Highly segmented HPGe detectors Reconstruction of scattering sequence from Compton vertices Pulse Shape Analysisto decomposerecorded waves · · · · · · · · 3 · · g 2 Digital electronics to record and process segment signals Reconstructed gamma-rays

  4. Pulse Shape Analysis concept A3 A4 A5 (10,10,46) B3 B4 B5 (10,30,46) C3 C4 C5 y B4 C4 CORE measured D4 x A4 F4 E4 791 keV deposited in segment B4 z = 46 mm

  5. Pulse Shape Analysis concept A3 A4 A5 B3 B4 B5 (10,10,46) C3 C4 C5 y B4 C4 CORE measuredcalculated D4 x A4 F4 E4 791 keV deposited in segment B4 z = 46 mm

  6. Pulse Shape Analysis concept A3 A4 A5 B3 B4 B5 (10,15,46) C3 C4 C5 y B4 C4 CORE measuredcalculated D4 x A4 F4 E4 791 keV deposited in segment B4 z = 46 mm

  7. Pulse Shape Analysis concept A3 A4 A5 B3 B4 B5 (10,20,46) C3 C4 C5 y B4 C4 CORE measuredcalculated D4 x A4 F4 E4 791 keV deposited in segment B4 z = 46 mm

  8. Pulse Shape Analysis concept A3 A4 A5 B3 B4 B5 (10,25,46) C3 C4 C5 y B4 C4 CORE measuredcalculated D4 x A4 F4 E4 791 keV deposited in segment B4 z = 46 mm

  9. Pulse Shape Analysis concept A3 A4 A5 B3 B4 B5 (10,30,46) C3 C4 C5 y B4 C4 CORE measuredcalculated D4 x A4 F4 E4 791 keV deposited in segment B4 z = 46 mm

  10. Pulse Shape Analysis concept A3 A4 A5 Result of Grid Searchalgorithm B3 B4 B5 (10,25,46) C3 C4 C5 y B4 C4 CORE measuredcalculated D4 x A4 F4 E4 791 keV deposited in segment B4 z = 46 mm

  11. A test-beam experiment has been performed to measure this parameter in realistic experimental conditions The position resolution required for the AGATA detectors Simulations suggest that the overall performance depends on the attainable position resolution

  12. Setup of the in-beam experiment Symmetric triple cluster d(48Ti,49Ti)p experiment performed at IKP of Cologne Silicon detector

  13. Doppler correction using PSA results 32 keV Full statistics used

  14. Doppler correction using PSA results 11 keV 32 keV Full statistics used

  15. Doppler correction using PSA results 4.8 keV 11 keV 32 keV Full statistics used PSA algorithm:Grid Search

  16. Simulation vs Experiment Recursive Subtraction Matrix Method Miniball Algorithm Grid Search Results obtained with different PSA algorithm

  17. Why Compton imaging? • 15 days of beam-time to perform the test experiment • 1 year of analysis • PSA will be on-line • Need for a simpler procedure • Need an prompt feed-back from on-line analysis

  18. Compton imaging • In-beam experiment: • typical conditionsof future use • Compton imagingof a radioactive source • inverse tracking E1 q E2 target E1 E2 q g-source

  19. Compton imaging performance Error on Compton identification of source direction from: • Position resolution (axis) • Energy resolution (scattering angle) • Compton profile(scattering angle) angular error [deg] scattering angle [deg]

  20. Imaging setup at LNL AGATA prototype detector TNT2 Digitizers: 4ch 14bit 100MHz 60Co source

  21. Outline of analysis/simulation DAQ MC Event selection Event selection PSA Smearing (position resolution) Image formation Image formation Position resolution

  22. Comparison to simulation Simple back-projections E MC + E res MC ≈ MC + E res + pos res Exp E,p ≈

  23. Comparison to MC simulation q profile of experimental image Experiment q [deg] peak FWHM[deg] 5.2 f [deg] position resolution FWHM[mm] f profile of experimental image Monte Carlo + 5 mm position resolution q [deg] peak FWHM[deg] 4.7 position resolution FWHM[mm] f [deg]

  24. Position resolution extracted by in-beam experiment and Compton imaging is 5 mm FWHM. This value is in line with the design assumptions of the AGATA spectrometer, confirming the feasibility of g-ray tracking. AGATA will have a huge impact on nuclear structure studies(first phase of AGATA: LNL 2009…) Possible applications of g-ray tracking detectors to imaging. CONCLUSIONS

  25. Basic implementation of LMML 0 1 20 6

  26. Compton imaging application

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