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Trigger report from Run2009

This trigger report provides an overview of the new features, hardware optimization, and performance improvements implemented during the Run 2009 at Nicolò Pisa. It includes details on the hardware upgrades, improvements in event reconstruction and observable resolution, as well as the efficiency and calibration adjustments made. The report also highlights the key findings and to-do's for the upcoming Run 2010.

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Trigger report from Run2009

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  1. Trigger report from Run2009 D. Nicolò Pisa

  2. Outlook • New features • hardware • firmware • Performance • eventreconstruction • observable resolution • efficiency • a novel trigger: a-calibration with beam on • Run summary • Todo’s for Run 2010 • automatic gain adjustment • dead time reduction Trigger report ...

  3. Hardware • Optimization of FADC dynamic range • needed to be improved from Run 2008 • further increase of XEC light yield towards nominal value • construction of newly designed FE cards with (0÷2V) swing • (used to be (0÷1V) beforehand) • 400 brand-new cards mounted on XEC Type1 channels • (inner PMT 1:1 + side&outer PMT 4:1 inputs) • board reworking • transmission of FADC selection bit • operated from the beginning of CEX run (15/10/09) with all XEC channels in the extended range • Resetting of active splitters • CM voltage changed to fit FADC range  linearity from a few up to 130 MeV Trigger report ...

  4. New FE scheme Low-pass filters (BW = 22 MHz) VOCM = VREF/2 Test and installation completed in October Trigger report ...

  5. Board modification User-programmable bit to select AD9218 gain • 0 = [0:1V] • Z = [0:2V] completed in September Trigger report ...

  6. Eγ-linearity in Run 2009 - p 0 n  γ γ - p  γ n 11B(p,γ)12C • offset < 150 keV • int. non-linearity < 1% 7Li(p,γ)8Be Trigger report ...

  7. Online Eγ resolution 7.5% FWHM Trigger report ...

  8. Eg efficiency • Gaussian smearing at threshold • Correlation with offline TRG energy • 6% FWHM: compatible with 0sR trgenetotalsum.energy (MeV) Trigger report ...

  9. Effect of saturation ISAT = 0 ISAT = 1 2.5 MeV shift • 23% of events with at least one saturated channel (@ 55 MeV) • threshold reduced by 3.5 MeV in the case of saturation Trigger report ...

  10. Todo • use QEs for PMT calibration • XEC stable, but need to compensate for gain variation • forced to reduce the threshold during Run 2009 Trigger report ...

  11. Δteγ |ΔT (LXe-TC)| expected to be flat (due to accidental background) σ(ΔT) = (3.1±0.1) ns (used to be 3.8 in run 2008) Online offset changed during the run Both edges are > 2.8 σout of the signal (as determined by the RMD peak) εΔT> 99.5% start end Δt (ns) Δt (ns) Trigger report ...

  12. zTC calibration • z-positron obtained by using TC bars based on λlog(Qu/Qd) • need to • equalize PMT • use LUTs (one a bar) to implement the log function • the absorption length was computed for each bar by using cosmic muons • may differ significantly one each other (ranging from 0.5 to 1m)  different LUTs for each bar been implemented since Dec 14 • used to be the same beforehand  same λ for all bars • z-resolution improved from 7.1 to 5.5 cm (might be 2.5 cm by using TC APDs) Trigger report ...

  13. Cosmic muons common LUT individual LUTs s = 7.1 cm s = 5.4 cm • DZ (cm) • DZ (cm) Trigger report ...

  14. MEG events common LUT individual LUTs s = 7.1 cm s = 5.6 cm DZ (cm) DZ (cm) Trigger report ...

  15. TC inefficiency • 48 bits serialized by DS90CR481 on 8+1 LVDS connections • 4.8 GBits/s Wrong LVDS transmission TC Type1 board  Type2 board • 6 bits missing  only te+ info got screwed • TC acceptance loss 7/30 = 23.3 % in the data collected from 5thto 27th November Transmission check implemented • data bus are recorded in memory buffers on both source and destination boards • memory comparison operated on-line by the Event Builder • check active on pedestal trigger (0.1 s-1) from then on Trigger report ...

  16. e+-γ direction • based on a LUT to associate XEC PMT  (φTC, zTC) • LUT generated by assuming σ(zTC) = 7.3 cm • efficiency computation based on a sample of Michel’s a) search for “good quality” track candidates (χ2, matched extrapolation to TC) b) track a backward hypothetical γfrom the decay vertex; c) γ hit position  XEC PMT index; d) XEC PMT index  search for hits on the TC in the LUT • turns out to be (88 ± 1)% • don’t expect significant variation with improved tracking • improved resolution (σ(zTC) =2.5 cm) in Run 2010 should result in a significant efficiency improvement Trigger report ...

  17. Performances: 2008 vs 2009 Trigger report ...

  18. -trigger • /γseparation based on different scintillation decay time = 22 ns, γ= 45 ns • couldn’t be operated last year due toionization quenching  γ Trigger report ...

  19. On-line -rings -selection efficiency  90% with the beam on! residual contamination from beam-related background < 20%  suppression by 3-orders of magnitude Trigger report ...

  20. After off-line cut Trigger report ...

  21. Physics Run Start Run 50180 2009-10-29 11:27:59 End Run 64482 2009-12-22 11:25:33 Total ‘wall clock time’ (WCT) 4 669 056 s ~ 54 d Trigger report ...

  22. DATA runs • Physics run Period (#50180 - #64482) • Time fraction dedicated to different run types XEC calib 10.3% DC calib 0.1% TC calib 3.0% Trigger report ...

  23. DAQ summary Total ‘wall clock time’ (WCT) 4 669 056 s Total ‘beam ON time’ (BOT) 4 119 567 s (88% of WCT) Total of Stop-Start time (DT) 3 961 022 s Total of Stop-Start time (MEGT) 3 354 497s Fractions: DT / WCT84.8 % (running DAQ) MEGT / BOT81.6 %(running MEG when beam on) other / BOT 1.1 % (beam related calibrations) LT / BWCT 81.5 %(DAQ livetime fraction) Leading to LT/BOT = 66 % LT/WCT = 59 % slightly increased w.r.t. Run 2008 LT/WCT = 49 % (55% if we exclude RMD runs) Trigger report ...

  24. How to improve? • DAQ • reduce inter-run gap (6.8 s, 2.1% deadtime) • and/or wake-up time (2.1 s, 0.6% deadtime) • (alternatively) have longer runs  larger filesize • Digitizer read-out • reduce read-out time new memory arrangement with multi-event buffering Deadtime26 ms  15 ms  17%  10%  demands for a major firmware upgrade Trigger report ...

  25. Outlook • Hardware • extended and programmable FADC range • Firmware • reconstruction improved w.r.t. Run 2008 • Stronger background rejection • Higher efficiency • -trigger implemented • efficiency > 80% (even higher in the case of side PMTs) • 3-order of magnitude suppression of beam-related background • don’t need dedicated runs any longer • Further improvements • zTC reco by TC-APDs • periodical XEC PMT gain calibration • reduce deadtime Trigger report ...

  26. Backup slides

  27. TC equalization • PMT equalization with cosmic muons, 2 factors • Assume ETC = sqrt(A0 * A1) and ZTC = ln(A0 / A1 ) • Use of cosmic muons • Equalize the landau distr. • Center at 0 the Z distr. Trigger report ... • Offline TRG ETC (a.u.) • Offline TRG ZTC (a.u.)

  28. Beam duty Beam ON Start 2009-10-29 11:27:57 End 2009-12-22 11:27:32 Total ‘proton time’ (PT) 4 669 175 s Total ‘beam ON time’ (BOT) 4 119 567 s (p-current>1500 mA) Fraction of ‘beam ON time’ (BOT/WCT) 88 % Trigger report ...

  29. MEG run benchmark 216 contiguous MEG runs in December Start run 63481 2009-12-18 19:58:20 End run 63696 2009-12-19 15:33:13 Benchmark ‘wall clock time’ (BWCT) of 70 493 s Live Time (LT) 57 458 s Total Time (TT) 68 568 s Sum of Stop-Start time (DT) 69 022 s Fractions: LT / TT 83.8 % (event read out, coherent with DAQ rate) LT / BWCT 81.5 % (event read out + DAQ) DAQ contribution to Dead Time DAQ wake up time (DT-TT)/2162.1 s DAQ inter run gap (BWCT-DT)/2156.8 s Trigger report ...

  30. Diff. driver Proces. Algor. • FADC • LVDS Tx Cyc. buff Cyc. buff • Type1 • FPGA Proces. Algor. Proces. Algor. • LVDS Rx • LVDS Rx • LVDS Tx • LVDS Tx Cyc. buff Cyc. buff Cyc. buff Cyc. buff • Type2 • Type2 • FPGA • FPGA Cyclic buffers Type1 layer Analog inputs Type2 layer Final Type2 Trigger output Trigger report ...

  31. TC inefficiency • TC trigger problem • New degrader • Red TRG 22 • Black TRG 0 • Direction match LUT OK • On Type2-0 • MC generated • Symmetric US/DS • Time match • On Type1-3 OK • Transmitted through LVDS Error • Type 1-3 Board replaced on Nov. 27th • Efficiency loss 7/30 = 23.3 % Trigger report ...

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