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AGATA 2 nd Prototype Detector Initial Measurements & Evaluation Andrew Boston, Matthew Dimmock, Laura Nelson, Sarah Rigby
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Singles scan results Overview Resolutions – Cologne, Liverpool - Values quoted are for single LVDS cable & single channel Initial coincidence scan results Summary
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Analogue Digital ChannelEnergy (MeV) Count Rate (kHz / Channel) FWHM (keV) FWTM (keV) FWHM / FWTM FWHM keV) Core1.1721.101.993.731.872.10 Core1.3321.102.053.911.912.10 A51.1720.451.963.851.961.85 A51.3320.451.983.871.952.00 A61.1720.451.933.741.941.90 A61.3320.451.983.901.971.90 D40.0590.280.971.821.881.15 D40.1220.280.991.891.911.14 E40.0590.280.991.911.931.17 E40.1220.280.991.831.851.17 C21.1720.461.833.391.85- C21.3320.461.963.541.81- D21.1720.461.793.341.87- D21.3320.461.813.391.87- Cologne – Resolution Measurements
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Liverpool - Pre-amp Signal Measurements Offsets are minimal Noise is very small, minimal pickup with no grounding
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Liverpool – Resolution Measurements Am – 241
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Liverpool – Resolution Measurements Am – 241 All channels < 1.25keV
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Liverpool – Resolution Measurements Am – 241 All channels < 1.25keV Variation is a function of capacitance
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Co – 60 Liverpool – Resolution Measurements
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Co – 60 Liverpool – Resolution Measurements Most channels < 2.1keV
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Co – 60 Liverpool – Resolution Measurements Most channels < 2.1keV Resolutions improve by ~0.2keV when all LVDS connected
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920MBq Cs-137 source 60 sec per position 1mm steps 1mm diameter collimator Cs-137 Singles Fine scan Max count rate = 720 cps Background = 40 cps 600keV CFD threshold Accepted triggers = 120 cps 180GB pre-sorted data
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Core 662kev – Ring gated Increased counts at edges – taper
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Risetimes – Core 662keV T30 T60 T90 Fast axis – Lattice orientation
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Risetimes – Core 662keV T30 T60 T90 Fast axis – Lattice orientation
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Core 662keV & Fold 1, Core T30
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Core 662keV & Fold 1, Core T90
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Core 662keV & Fold 1, Segment T30
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Core 662keV & Fold 1, Segment T90
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Core 662keV & Energy confined to ring, Core T30
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Core 662keV, Segment confined to ring, Core T60
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Core 662keV & Energy confined to ring, Core T90
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Core 662keV, Seg 662keV,Core T30
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Core 662keV, Segment 662keV, Segment T30
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Collimation gap centred on (w.r.t. crystal base): 2mm 13.5mm 29mm 48mm 65mm 83.7mm Physical segmentation depth: 0mm 21mm 36mm 72mm 54mm 90mm 8mm Coincidence Setup Div = 1.5mm Div = 2.1mm
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Initial scan – Counts per hour
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1.4mm 2.8mm
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Initial scan – Counts per hour 1.4mm 2.8mm
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Summary Ongoing off-line singles analysis Corrected scan setup following initial coincidence scan line Currently running radial scan across y-axis (4mm steps)
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Radial scan across y-axis (4mm steps)
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Summary Ongoing off-line singles analysis Corrected scan setup following initial coincidence scan line Currently running radial scan across y-axis (4mm steps) HELP !!!!!!!!
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Initial Proposal: Current Plans: Hexagonal or Cubic Grid? Coincidence Grid
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Initial Proposal: Current Plans: Hexagonal or Cubic Grid? Coincidence Grid Equidistant points ???
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