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Scanning of the First AGATA Symmetric Prototype Detector: Analysis and Results

This study presents scanning results of the AGATA detector prototype at Liverpool, unveiling its azimuthal response through detailed experimentation. The detector's physical and electrical specifications, data acquisition procedures, energy measurements, coincidence scanning, statistics, and analysis of outer contacts are thoroughly examined. The study includes in-depth analysis of noise levels, preamp decay correction, time alignment, and transient charges. The research delves into the azimuthal geometry of outer contacts, transient magnitudes, and risetimes in various depths, providing valuable insights into the detector's performance and capabilities for future applications.

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Scanning of the First AGATA Symmetric Prototype Detector: Analysis and Results

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  1. Scanning of the First AGATA Symmetric Prototype Detector at Liverpool and the Detector’s Azimuthal Response Acknowledgements: M.R. Dimmocka, A.J. Bostona, H.C. Bostona, J.R. Cresswella, P.J. Nolana, I. Lazarusb, J. Simpsonb, P. Medinac, C. Santosc, C. Pariselc. a Oliver Lodge Laboratory, The University of Liverpool, Oxford Street, Liverpool L69 7ZE, UK. bCCLRC Daresbury Laboratory, Warrington WA4 4AD, UK. c Institut de Recherches Subatomiques, Strasbourg BP28 67037, France Laura Nelson, The University of Liverpool ln@ns.ph.liv.ac.uk

  2. 24 30 36 6 12 25 29 31 35 18 1 5 7 11 13 17 19 23 2 4 8 10 14 16 20 22 26 28 32 34 3 9 15 21 27 33 Physical & Electrical Details Labelling scheme adopted for ease of programming; Physical segmentation: Sectors labelled A-F (anticlockwise) Rings labelled 1-6 (bottom-top) • +4000V, ±12V supplied using NIM modules • Differential signals -> single ended using CWC converter boxes • GRT4 digitiser cards sample over ±1V using 80MHz FADCs • Each of the 37 channels provides 250 samples of data for each event • External CFD on central contact triggers the cards • No global clock Scans performed: • Front face singles scan • Tapered side singles scan • Front face coincidence scan of 1 sector (E) 1

  3. Front Face Singles Scans • 11.1MBq Cs-137 source (E = 662keV) • Cartesian grid in 2mm steps • 2 minutes per position • Injection collimator: 2mm diameter, 80mm long • CFD threshold on central contact of 650keV • ~500 counts per second (core) • Data reduced to ~30% using active geometric zero suppression z Incident photons Intensity of counts as a function of position Energy Gate 646keV->699keV (applied to the central contact) No Energy Gate y y x x

  4. Intensity Plots Intensity of counts as a function of position for each ring of segments. Energy gate (646keV->699keV) applied to both electrodes

  5. T90 Polar Plots Outer Contact Central Contact Core and segment energy gate 640->677keV Counts threshold >300 in the segment Core energy gate 640->677keV Counts threshold >1600 in the ring

  6. T30 Polar Plots Outer Contact Central Contact Core and segment energy gate 640->677keV Counts threshold >300 in the segment Core energy gate 640->677keV Counts threshold >1600 in the ring

  7. NaI Energy Region of Interest 288 keV 374 keV Ge Energy Front Face Coincidence Scans • System triggered on any of the 8 NaIs AND the correct energy (~374keV) on the Ge central contact • 11.1MBq Cs-137 source (E = 662keV) • Injection collimator: 2mm diameter, 80mm long 3d interaction position information for 6 depths

  8. 3 2 4 1 5 6 Coincidence Scanning 1 – 18mm radius, 10 hrs per position 2 – 23mm radius, 8 hrs per position 3 – 28mm radius, 6 hrs per position 4 – 30, 12 hrs per position 5 – 15, 12 hrs per position 6 – 0, 12 hrs per position Statistics: At 18mm radius Front: 50c/h Back: 1.5c/h Collimation gap centred on (w.r.t. crystal base): Physical segmentation depth: 90mm 81.15mm 72mm 62.5mm 54mm 45.6mm 36mm 3mm 28.5mm 21mm 15.5mm 8mm 6mm 0mm

  9. Azimuthal Geometry of Outer Contacts 3 2 4 1 5 6

  10. Coincidence Analysis R.M.S. noise ~7keV P2P noise ~10keV

  11. Coincidence Analysis R.M.S. noise ~7keV P2P noise ~10keV Hitsegment pulse shows decaying preamp

  12. Coincidence Analysis R.M.S. noise ~7keV P2P noise ~10keV Preamp decay correction

  13. Coincidence Analysis R.M.S. noise ~7keV P2P noise ~10keV Preamp decay correction 100 events

  14. Coincidence Analysis R.M.S. noise ~7keV P2P noise ~10keV Preamp decay correction 100 events Time alignment

  15. Coincidence Analysis R.M.S. noise ~7keV P2P noise ~10keV Preamp decay correction 100 events Sum 100 events R.M.S. noise ~1.8keV P2P noise ~2.5keV Time alignment

  16. Transients F1 A1 Transient charges produced in segments either side of that containing the FEE (segment E1) for each azimuthal angle of the r=28mm scan E1 B1 D1 Z = 6mm C1 Image in Segment D1 Image in Segment F1

  17. Transient Magnitudes FEE in Segment 5 Z = 6mm FEE in Segment 11 Z = 15.5mm FEE in Segment 17 Z = 28.5mm

  18. Outer Contact Risetimes – 1st depth Z = 6mm T90 Polar Plot

  19. Central Contact Risetimes – 1st depth Z = 6mm T90 Polar Plot

  20. Outer Contact Risetimes – 2nd depth Z = 15.5mm T90 Polar Plot T90

  21. Central Contact Risetimes – 2nd depth Z = 15.5mm T90 Polar Plot T90

  22. Outer Contact Risetimes – 6th depth Z = 81.5mm T90 Polar Plot

  23. Central Contact Risetimes – 6th depth Z = 81.5mm T90 Polar Plot

  24. MGS Simulation Results Z=14mm Z=8->21mm

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