Digital Electronic Tests at JYFL
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Transcript of Digital Electronic Tests at JYFL
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Digital Electronic Tests at JYFL
• Introduction• Synchronisation Tests / TDR Integration• Phase I Detector Tests• Clover Tests
Pete Jones, University of JyväskyläSAGE / LISA Kick-Off Meeting
Daresbury Laboratory, 2nd September 2005
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TNT2
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TNT2
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Synchronisation
• TNT uses 100MHz clock, but currently cannot be used as a ”slave”– Use sync pulses from TDR metronome– Use pseudo-random pulse generator into both TDR
and TNT– Merge / Time differences offline
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Syncronisation Results• Pseudo-random generator shows 0.6x10-6 cannot be corellated
• TNT ”dead-time” ~1.8% (10kHz input) : < 4us pulses
• Dead time possible in both systems
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In Beam Tests
• Idea : Test both analogue and digital electronics in real situation
• Test effects of counting rates
• Performance more realistic than with sources (multiplicity)
• Idea of what kind of gamma-ray array need would be for the future
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• 107,109Ag(36Ar,2p2n)139Eu
• 160MeV β~2.5%• Ib=5 – 50 pnA• Ge count rate 10-100kHz• RITU Gas counter 1-10kHz
Test Reaction
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Phase 1 Tests
Ge 1
Ge 2
BGO 1
BGO 2
SYNC/RESYNC
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Threshold of Digital vs Analogue
Lower threshold Higher Background(veto)
..but...
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Analogue : Effect of Rate(pileup)
10kHz
100kHz
50kHz
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Phase 1 : Analogue
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Phase 1 : Analogue
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Phase 1 : Digital
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Phase 1 : Digital
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Phase 1 Tests : Summary
• Analogue limited by pileup & resolution
• Digital offers lower energy thresholds
• Veto handling in digital needs some work, as does marking of data
• Digital solution improves counting rate up to 40-50kHz
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Clover Tests
Angle 1 : 69.2o EUROGAM II = 75.5o
Angle 2 : 117.5o EUROGAM II = 104.5o
Target – detector distance same as in EUROGAM IIDetector Resolution ~2.5 keV
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Clover
Ge44
Clover
Ge44
Angle 1 : 69.2o
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Clover
Ge23
Clover
Ge23
Angle 2 : 117.5o
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n=2
n=1
Unsuppress
”clean”
Suppression, Sum & Fold
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E1+3
E3
E1
”clean”
Diagonal Crystals 4 13 2
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sum
Clover
Ph 1
g713
g554
g323
γ-γ coincidence matrix
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50kHz
20kHz
10kHz
70kHz
40kHz
Digital Data…
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Summary
• Instrument Digital Electonics into TDR : Need some ”TDR” compatability
• Digital electronics : – seems work well with phase 1, and improves counting capability– Offer lower thresholds– Need some work on veto / data
• Clover detector gives as good performance as phase 1– More efficient– Digital problems need to be solved