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Gamma-ray Large Area Space Telescope

Gamma-ray Large Area Space Telescope. TKR Distributions Michael Kuss INFN Pisa LAT CU Beam Test Kick-Off Workshop 20 March 2006. Requirements. Existing Information. full description on the LAT IA group web page (or the workbook) digi root file : almost everything from the XxxDigi TDS

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Gamma-ray Large Area Space Telescope

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  1. Gamma-ray Large Area Space Telescope TKR Distributions Michael Kuss INFN Pisa LAT CU Beam Test Kick-Off Workshop 20 March 2006

  2. Requirements

  3. Existing Information • full description on the LAT IA group web page (or the workbook) • digi root file: almost everything from the XxxDigi TDS • recon root file: almost everything from the XxxRecon TDS • MeritTuple: reconstructed, simple (F,I) variables • SvacTuple: not all of MeritTuple, plus more variables, plus multi-dimensional arrays • BeamTestTuple: do we really need another ntuple? • I am unsure whether all reconstructed variables are valid for the CU geometry (e.g. CalEneCorr)!

  4. Tkr Cluster Sizes Why should we do this with gammas? Cluster sizes don’t exist in any ntuple. new variable TkrClusSizeCol[tower,layer,view]

  5. TKR Pulse Durations Why should we do this with gammas? In SVACtuple: tot[tower,layer,view,end] (totCorrL[…],totCorrQ[…])

  6. TKR Track Topologies Do these still exist? TkrSurplusHitsInside gave the number of clusters inside a cone around the best track. TkrSurplusHitRatio gave the ratio of out to in. Tkr[1/2]ClusDocaCol[...]

  7. TKR-CAL Matching Here I see a reason for electrons and gammas. But why side-incident protons? CalTrackDoca (MeritTuple). What happened to CalTrackAngle? MeritTuple: vtx position and direction, and also CAL energy centroid position and track direction

  8. Low Energy Particle Range-Outs • Does it make sense also for events with more than one track? • Shall we only study this for tracks ending in noConv trays? Or compare? • Position of first hit: Tkr[1/2][X/Y/Z]0 • Do we have the position of the last hit somewhere? • I’m also unsure about what is needed for the ToT.

  9. Backsplash The SVAC ntuple has zillions of ACD variables. But I’m unsure how to study this.

  10. Geant4 Benchmarking More or less, we want to study everything here. Ntuple or digi/recon root files?

  11. PSF Compare vtx direction versus the incoming particle beam

  12. Gamma Reconstruction Maybe same as PSF. Study direction versus angle. Also some real physics here (tagger efficiency, dead time, …)

  13. 100 GeV Gamma (The Good …)

  14. 100 GeV Gamma (… and the Bad and Ugly)

  15. GTRC Buffer Studies • each TkrFM has 8 read-out cables (GTCC) • each GTCC • connects to 9 GTRC’s (e.g. all odd x-planes read-out left side) • a maximum of 128 hits can be buffered • read-out starts from below • each GTRC can read up to 64 hits (programmable) • Two planes can already fill-up the buffer: • GTRC limit of 14 (9*14=126 < 128) • Christmas tree (smaller buffer in top planes, larger at bottom)

  16. A New Family Member

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