1 / 28

A G A T A 2 nd Prototype Detector

A G A T A 2 nd Prototype Detector. Initial Measurements & Evaluation. Andrew Boston, Matthew Dimmock, Laura Nelson, Sarah Rigby. Overview. Resolutions – Cologne , Liverpool - Values quoted are for single LVDS cable & single channel. Singles scan results.

lundy
Download Presentation

A G A T A 2 nd Prototype Detector

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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 ???

More Related