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Initial Measurements and Evaluation of the AGATA2 Prototype Detector

This report presents the initial measurements and evaluation of the AGATA2 prototype detector, focusing on resolution values obtained in Cologne and Liverpool. Key findings include singles and coincidence scan results, with detailed samples for Am-241 and Co-60 isotopes. Notable improvements in resolution were observed when multiple LVDS channels were connected. The document outlines effective scan setups and ongoing analysis efforts, including a current radial scan across the y-axis. Proposed future work includes exploring hexagonal or cubic grid patterns for coincidence setups.

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Initial Measurements and Evaluation of the AGATA2 Prototype Detector

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  1. AGATA2nd Prototype Detector Initial Measurements & Evaluation Andrew Boston, Matthew Dimmock, Laura Nelson, Sarah Rigby

  2. Overview • Resolutions – Cologne , Liverpool • - Values quoted are for single LVDS cable & single channel • Singles scan results • Initial coincidence scan results • Summary

  3. Cologne – Resolution Measurements

  4. Liverpool – Resolution Measurements Am – 241

  5. Liverpool – Resolution Measurements Am – 241 • All channels < 1.25keV

  6. Liverpool – Resolution Measurements Am – 241 • All channels < 1.25keV • Variation is a function of capacitance

  7. Liverpool – Resolution Measurements Co – 60

  8. Liverpool – Resolution Measurements Co – 60 • Most channels < 2.1keV

  9. Liverpool – Resolution Measurements Co – 60 • Most channels < 2.1keV • Resolutions improve by ~0.2keV when all LVDS connected

  10. Cs-137 Singles Fine scan • 920MBq Cs-137 source • 60 sec per position • 1mm steps • 1mm diameter collimator • Max count rate = 720 cps • Background = 40 cps • 600keV CFD threshold • Accepted triggers = 120 cps • 180GB pre-sorted data

  11. Core 662kev – Ring gated • Increased counts at edges – taper

  12. Risetimes – Core 662keV T30 T90 T60 • Fast axis – Lattice orientation

  13. Risetimes – Core 662keV T30 T90 T60 <100> <100> <100> <010> <010> <010> • Fast axis – Lattice orientation

  14. Core 662keV & Fold 1, Core T30

  15. Core 662keV & Fold 1, Core T90

  16. Core 662keV & Fold 1, Segment T30

  17. Core 662keV & Fold 1, Segment T90

  18. Core 662keV & Energy confined to ring, Core T30

  19. Core 662keV & Energy confined to ring, Core T90

  20. Physical segmentation depth: Collimation gap centred on (w.r.t. crystal base): 90mm 72mm 54mm 83.7mm 36mm 21mm 8mm 65mm 48mm 29mm 13.5mm 2mm 0mm Coincidence Setup Div = 2.1mm Div = 1.5mm

  21. Initial scan – Counts per hour

  22. Initial scan – Counts per hour 1.4mm 2.8mm

  23. Initial scan – Counts per hour 1.4mm 2.8mm

  24. Summary • Ongoing off-line singles analysis • Corrected scan setup following initial coincidence scan line • Currently running radial scan across y-axis (4mm steps)

  25. Radial scan across y-axis (4mm steps)

  26. Summary • Ongoing off-line singles analysis • Corrected scan setup following initial coincidence scan line • Currently running radial scan across y-axis (4mm steps) HELP !!!!!!!!

  27. Coincidence Grid Current Plans: Hexagonal or Cubic Grid? Initial Proposal:

  28. Coincidence Grid Current Plans: Hexagonal or Cubic Grid? Initial Proposal: Equidistant points ???

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