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Preliminary Results of the Outer Tracker Test Beam Status Report

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This report presents preliminary findings from the Outer Tracker Test Beam analysis, detailing the setup, trigger mechanism, silicon telescope parameters, multiple scattering calculations, and key analysis results. The Outer Tracker system, which consists of multiple modules and silicon planes, has been examined through independent readouts. The efficiency, resolution, and cross-talk parameters are outlined, with a promising outlook for further optimization. Insights gained from data acquisition and event analysis highlight essential metrics to be refined for enhanced performance in future experiments.

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Preliminary Results of the Outer Tracker Test Beam Status Report

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  1. Outer Tracker Test beam preliminary results Outer Tracker Status Report J. Nardulli, G. van Apeldoorn, S. Bachmann, . Bauer, E. Bos, Y. Guz, T. Haas, T. Ketel, J. Knop, M. Nedos, A. Pellegrino, T. Sluijk, N. Tuning, U. Uwer, P. Vankov, D. Wiedner, A. Zwart.

  2. Introduction • Outline: • Setup • Trigger and Data Acquisition • Silicon Telescope • Multiple Scattering Calculation • Outer Tracker Analysis and preliminary results • Outlook

  3. Setup (I)

  4. Setup (II) • Legenda • S1,S2,S3 are scintillators. Dimensions (8mm*8mm) • P1,P2,P3 are X/Y Silicon planes (4cm*4cm). Each plane reads out 1280 channels. 640 in X and 640 in Y. • M0,M1,M2,M3 are 4 OT modules produced in Warsaw (340mm*2500mm). • S4,S5 are Scintillators. Dimensions ~(20cm*10cm).

  5. Trigger and Data Acquisition • 2 Independent Read outs: • OT • Silicon • 2 different run schemes • OT stand alone (see Mirco) • OT + Si Telescope

  6. Trigger and Data Acquisition OT + Si Telescope • Main characteristics : • Rate : 10Hz • Trigger : Coincidence of the 5 Scintillators • Size of Si illuminated 2 straws illuminated per layer • Scintillators give time reference

  7. Telescope resolution The residual of the Si clusters is ~ 12 micron Accuracy of prediction limited by Multiple Scattering. X Residual Plane P3 Resolution = 12µ Si Planes

  8. Multiple Scattering Calculations General Formula: X_0 = Radiation Length x = Thickness p = Momentum q = Charge d = distance c = velocity We get: Third Si_plane (d = 389mm): 57.02 micron Third Scintillator (d = 400mm): 72.45 micron Common contribution: 96.71 micron Values cp = 6000 MeV Scintillator) x= 4mm; X_0(Scint) = 42.4cm Si_Plane) x= 0.6mm; X_0(Si) = 9.37cm

  9. Tracks Selection • Strong selection on good tracks: • -0.0005 < Horizontal slope < 0.0005 • -0.001 < Vertical slope < 0.001 Preliminary Vertical Track Slope Horizontal Track Slope

  10. OT Analysis • OT Parameters: • 4 Short modules Ar/Co2 : 70/30 • HV Scan [1475 : 1725] V • Threshold of FE [500 : 900 ] mV • Parameters varied for 2nd and 3rd module • Preliminary. Only looking at 2 straws: Mod 1, Ch 104, Layer B • Mod 2, Ch 23, Layer A Main Points: -Drift Time distribution - Cross Talk - Time – distance relation (R(t)) - Resolution - Efficiency

  11. Drift time Distribution Mod 1 Ch 104 HV = 1550 V Mod 2 Ch 23 HV = 1550 V Drift time (0.4*ns) Drift time (0.4*ns)

  12. Cross TalkPreliminary Estimation Mod 2 Ch 23 ; HV = 1550 V Mod 2 Ch 23 ; HV = 1725 V Estimated CrossTalk = 4.1 % Estimated CrossTalk = 32.9 % Higher Voltage Larger signal Larger Crosstalk in FE

  13. R-t CalibrationFirst rough estimation First Rough R-T Calibration: necessary for the Resolution. 1 straw = 4.9mm Plot is fitted with a second order polynomial The values found are used for the Resolution calculation. Drift time (0.4*ns) Module 1 – Ch 104 (HV =1550V) Predicted x position (µm)

  14. Resolution • Rough R-T Calibration • We are looking at ½ straw: 2.5mm • Remember the Mul.Scat. Calculation ~ 96.71 micron • This is a monitoring value and not the final result !!! Module 1 – Ch 104 (HV =1550V) Resolution 315 micron

  15. Multiple Scattering Measurements • Procedure • Resolution measured for various Energies • With and without S3 Multiple scattering is obtained via:

  16. EfficiencyPreliminary Estimation All the events, Ch 103 and 105 not hit All the events Ch 104 has a hit. Ch 103 and 105 not hit Efficiency Module 1 – Ch 104 (HV =1550V) Efficiency = 94 % 1 straw = 4.9mm Predicted x position

  17. Efficiency and ResolutionVarious HV values Efficiency 100 90 Preliminary 1550 HV (Volt) Resolution Threshold value : 700 mV 360 300 1550 HV (Volt)

  18. Efficiency and ResolutionVarious Threshold values Efficiency 100 90 Preliminary 700 Threshold (mVolt) Resolution 350 250 HV value = 1550 V 700 Threshold (mVolt)

  19. Outlook • First results look promising, but still much to do… • Redo the RT Calibration • Look at all the 16 straws • Investigate and optimize the angle cuts • Get final numbers for Resolution, Efficiency • Determine Cross Talk

  20. Conclusions The test beam was a lot of work… but a lot of fun too !!! Who pushed the emergency at 3:00 am?

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