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LAT performance studies

LAT performance studies. R esults from Cracow ( by A.Kowal, B.Pawlik, L.Zawiejski ) L.Suszycki AGH University of Science and Technology Cracow. Forward Calorimetry Region with new design of the Mask. LAT parameters: distance from the IP 305-325 cm radial dimensions 8-28 cm

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LAT performance studies

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  1. LAT performance studies Results from Cracow (by A.Kowal, B.Pawlik, L.Zawiejski) L.Suszycki AGH University of Science and Technology Cracow

  2. Forward Calorimetry Regionwith new design of the Mask LAT parameters: • distance from the IP 305-325 cm • radial dimensions 8-28 cm • angular coverage • 26.2<<82 mrad • 0<<360 deg Prague, 15-17 April 2004

  3. Switching the geometry: From the conical one (TDR version) to the cylindrical one. Two competitive structures of the Si/W sandwich calorimeter are considered: Si pads Si strips LAT detector versions Prague, 15-17 April 2004

  4. Simulated LAT pad-structure Si pads/W calorimeter • 16 cylinders (in r) • 30 rings (in z) • 24 sectors (in ) => 11520 channels • analyzed angular range: • 30<<78 mrad • 0<<360 deg Prague, 15-17 April 2004

  5. Simulated LAT pad-structure 2Large statistics behaviour Angular reconstruction not satisfactory – Simple reconstruction bias and resolution ~0.2 - 0.3mrad, (with 16 cylinders), can be reduced at price of large #channels Prague, 15-17 April 2004

  6. Stripped LAT description • LAT consists of 30 tungsten disks • Each disk has silicon strip detector attached • Every second detector has either 120 radial or 64 concentric strips • In total there is 2960 read-out channels Prague, 15-17 April 2004

  7. Stripped LAT reconstruction Accuracy of order 0.5x10-4 radian in measuring polar angleMeasurement of 250GeV electron energy withaccuracy 5GeV(ΔE~0.31√E) Prague, 15-17 April 2004

  8. Stripped LAT -Bhabha eventsMeasurement of the scattered electron energy withaccuracy 7GeV(ΔE~0.44√E) Egen - Erec Prague, 15-17 April 2004

  9. Stripped LAT -Bhabha events2Reconstruction of energy of the back-to-back electron pair E (GeV) Prague, 15-17 April 2004

  10. Stripped LAT -Bhabha events3Reconstruction of theta angle of the back-to-back electron pair Gen. Rec. θ(mrad) Prague, 15-17 April 2004

  11. Stripped LAT -Bhabha events4Acolinearity θL – θR (mrad) Prague, 15-17 April 2004

  12. Stripped LAT -Bhabha events5Angle reconstruction accuracy ~0.09 mrad θgen – θrec (mrad) Prague, 15-17 April 2004

  13. Beamstrahlung background No photons are seen in LAT (θ>26 mrad) Prague, 15-17 April 2004

  14. Beamstrahlung background 2 Prague, 15-17 April 2004

  15. Beamstrahlung background 3Pairs from beamstrahlung in LAT angular range Prague, 15-17 April 2004

  16. Beamstrahlung background 4Energy from beamstrahlung in LAT angular range Background may be present at rmin (deg) and azimuthal angle 0/180 degrees (deg) Prague, 15-17 April 2004

  17. Summary • LAT with pads: reconstruction algorithm to be improved or changed completely • Stripped LAT: seems ok • Bhabha events: in progress • Beamstrahlung: needs detector simulation Prague, 15-17 April 2004

  18. The end Thank you

  19. Notices Stripped LAT: E_rec = 60.79*E_seen Generated 20 000 events, reconstr. 9800 (26 – 86 mrad) Beamstrahlung: TDR, FC Proposal 20-40 TeV/bx, Jeju 20 TeV A.Stahl 500 TeV/bx photons, 100 TeV/bx pairs (in BeamCal 5 TeV/bx and 20 TeV/bx) – Zeuthen Nov 2002 Prague, 15-17 April 2004

  20. Reconstruction results (512ch) Prague, 15-17 April 2004

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