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Digital Electronic Tests at JYFL

Digital Electronic Tests at JYFL. Introduction Synchronisation Tests / TDR Integration Phase I Detector Tests Clover Tests. Pete Jones, University of Jyväskylä SAGE / LISA Kick-Off Meeting Daresbury Laboratory, 2nd September 2005. TNT2. TNT2. Synchronisation.

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Digital Electronic Tests at JYFL

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  1. Digital Electronic Tests at JYFL • Introduction • Synchronisation Tests / TDR Integration • Phase I Detector Tests • Clover Tests Pete Jones, University of JyväskyläSAGE / LISA Kick-Off MeetingDaresbury Laboratory, 2nd September 2005

  2. TNT2

  3. TNT2

  4. 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

  5. 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

  6. 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

  7. Test Reaction • 107,109Ag(36Ar,2p2n)139Eu • 160MeV β~2.5% • Ib=5 – 50 pnA • Ge count rate 10-100kHz • RITU Gas counter 1-10kHz

  8. BGO 1 BGO 2 Phase 1 Tests Ge 1 Ge 2 SYNC/RESYNC

  9. Threshold of Digital vs Analogue ..but... Higher Background (veto) Lower threshold

  10. Analogue : Effect of Rate(pileup) 100kHz 50kHz 10kHz

  11. Phase 1 : Analogue

  12. Phase 1 : Analogue

  13. Phase 1 : Digital

  14. Phase 1 : Digital

  15. 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

  16. 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 II Detector Resolution ~2.5 keV

  17. Angle 1 : 69.2o Clover Ge44 Clover Ge44

  18. Angle 2 : 117.5o Clover Ge23 Clover Ge23

  19. Suppression, Sum & Fold n=2 n=1 Unsup press ”clean”

  20. Diagonal Crystals • 1 • 3 2 E1+3 E3 E1 ”clean”

  21. γ-γ coincidence matrix sum g713 g554 g323 Clover Ph 1

  22. Digital Data… 70kHz 50kHz 40kHz 20kHz 10kHz

  23. 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

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