Detector Characterisation Group Detector Characterisation Group A. Boston and the Liverpool group CCLRC Daresbury Laboratory Characterisation Group Preliminary report on AGATA detector #1 • Full characterisation of prototype crystal – Detailed source scans – Coincidence measurement
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Detector Characterisation Group A.Boston and the Liverpool group CCLRC Daresbury Laboratory Characterisation Group Preliminary report on AGATA detector.
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Detector Characterisation Group
A. Boston and the Liverpool groupCCLRC Daresbury Laboratory
Characterisation Group
Preliminary report on AGATA detector #1
• Full characterisation of prototype crystal– Detailed source scans– Coincidence measurement
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roup AGATA prototype triple cluster
• Prototype symmetric triple cluster• Ordered from CE• Segmentation scheme 8, 13, 15, 18, 18, 18 mm
90 × 80 mm10º tapering angle
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AGATA data analysis summary
• A number of measurements have been made:• Analogue energy resolution results
– A 370kBq 60Co source was placed near the detector.– An Ortec 671 Spectroscopy amplifier was used with 6us of
shaping to produce energy resolutions.– The count rate was <1000cps.– The core energy resolution was measured to be 2.6 keV.
• Efficiency measurement• Digital electronics
– Energy resolution– Scattering / Addback
• Singles scan• Coincidence scan
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AGATA detector scanning
• Detector scans• MRD26 connector blocks
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AGATA detector measurements
• Performance tests of the AGATA prototype detector.• Fitted with GANIL differential preamplifiers• CWC differential to single ended converters (manufactured
at TU Munich) used to provide single ended signal to electronics.
• GRT4 digital electronics cards
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AGATA cabling scheme
• AGATA detector connected to CWC modules through 7 MRD cable cables.
• 37 BNC > SMA cables connect to GRT4 modules.• The cabling scheme groups segments in rings:
– 1-6 ring 1– 7-12 ring 2 etc.
• The core is channel 37.
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Front Back
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Digital Pulse Shape Processing
• GRT 4 cards with 80Mhz sampling 14bit dynamic range• The cards now have MWD implemented, courtesy of Ian
Lazarus and Martin Lauer.• Digital CFD is implemented.• Common card time stamping (48bit) is implemented.
• Parker linear positioning table• Pacific scientific stepper motors• 0.3mCi 137Cs/0.2mCi 57Co• 1-2mm collimator• Singles/coincidence system
GSI / CSNSM Orsay
Precise position calibration
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Example traces
• Typical example of from detector for the singles scan measurement
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AGATA Detector Pulse shapes
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20 21 22
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AGATA detector scan
• AGATA singles scan• Intensity map for 662keV interaction on centre contact• 2mm collimator / 2 minutes per position• 0.3mCi 137Cs source• 300Gb of data on SDLT tape
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AGATA singles scan
• Detector response vs depth: 662 keV on core• Any energy on segments
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AGATA singles scan
• Detector response vs depth: 662 keV on core• 662keV energy on segments
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Scattering / Cross talk results
• Multiplicity two scatter plot for AGATA segments (singles scan)
2 (B1) – 27 (C5)34085 counts (695 bkgrd)
3 (C1) – 21 (C4)164556 counts (1235 bkgrd)
7 (A2) – 25 (A5)132227 counts(1124 bkgrd)
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AGATA singles scan : Core risetime results
T30 T60
T90 Centre contact risetime results
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AGATA singles scan – T30 vs depth
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AGATA singles scan – T90 vs depth
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Coincidence measurement
• Sector E has been scanned – singles intensity profile.
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What data was recorded?
• Coincidence data was recorded on three lines and three radii.
• 2mm steps.• The data was recorded to
SDLT tape.
• Position from scanning table and step number• High resolution energy from core and NaIs from Silena ADCs• TAC of Ge core vs NaI firing.• GRT 4 data from 37 channels (512 samples 80Mhz)
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AGATA coincidence
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34mm44mm53.38mm
66.26mm
83.14mm
100.02mm
118.55mm
80mm
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3mm Dead layer including Al can
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AGATA coincidence
• Coincidence data has been recorded along 3 lines and 3 radii inside sector E of the detector.
• The data is in rings w.r.t. centre (x,x):– Ring 1 : 28mm radius / 6 hours per position– Ring 2 : 23mm radius / 8 hours per position– Ring 3 : 18mm radius / 10 hour per position
• In lines– Line 1 : 0O 26mm / 12 hours per position– Line 2 : 15O 26mm / 12 hours per position– Line 3 : 30O 26mm / 12 hours per position