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M0’ linearity study

M0’ linearity study. Contents : Electronic injection Laser injection Beam injection Conclusion. Monitoring system description. Absolute linearity study of PN readout electronics. Relative linearity study of APD readout electronics with respect to PN diodes. Beam :

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M0’ linearity study

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  1. M0’ linearity study • Contents : • Electronic injection • Laser injection • Beam injection • Conclusion M0' workshop

  2. Monitoring system description Absolute linearity study of PN readout electronics Relative linearity study of APD readout electronics with respect to PN diodes Beam : Consistency check of the method M0' workshop

  3. PN linearity with test pulse • Able to measure absolute non-linearity on PN electronics Look at residuals M0' workshop

  4. APD study : Pedestal corrections • Remarks on pedestals : • Variation with laser intensity • 100 crystals fired at the same time ! • BUT : • Pedestals different forFixed G33 and Free G33 ! • Hidden free gains (G9, G5 and G1) pedestals inaccessible ! • Affect energy measurement ! • Laser in fixed and free gain • Beam in free gain • Use dynamic pedestals XT1142 M0' workshop

  5. FPPA non-linearity after PN correction • Non-linearities less pronounced in G33 than previously found in september • Effect of dynamic pedestals XT1142 M0' workshop

  6. Beam injection • Ingredients : • Energy computation • Dynamic pedestals (not very useful : fixed gain) • Crystal intercalibration @ 120 GeV/c, @G33 • G33/G9 intercalibration from Laser runs • To be refined due to change of fppa shaping time with amplitude (G9)  disentangle laser pulse width and fppa shaping effects • Use experimental pulse shapes • Two energy scan : • 2002/08/07 : 20 – 35 – 50 – 80 – 120 – 150 – 180 GeV/c • 2002/08/23 : 20 – 30 – 50 – 80 – 120 – 150 – 180 –200 – 250 – 280 GeV/c • Look at crystal 1142 & 1144 • For single crystal analysis : • 2x2 mm at maximum energy deposition M0' workshop

  7. Beam injection • Location of maximum energy deposition : • Log dependence with energy • Different for X and Y • Check in MC (A. Givernaud) • OK M0' workshop

  8. Linearity results with beam • Without linearity corrections : Suspicious runs … Wrong Xtal ? Calibration changeby 6/1000 between 2002/08/07 and 2002/08/23 ! 2002/08/07 2002/08/07 2002/08/07 2002/08/07 XT1142 XT1144 M0' workshop

  9. Linearity results with beam • With linearity corrections : No laser data at this energyfor this crystal XT1142 XT1144 M0' workshop

  10. 2002/08/07 2002/08/07 2002/08/23 2002/08/23 Resolution with electron • Single crystal (S1) : ~250 MeV noise XT1142 XT1144 M0' workshop

  11. 2002/08/07 2002/08/07 2002/08/23 2002/08/23 Resolution with electron • Sum of 5 crystals (S5) : ~1250 MeV noise XT1142 XT1144 M0' workshop

  12. 2002/08/07 2002/08/07 2002/08/23 2002/08/23 Resolution with electron • Sum of 9 crystals (S9) : ~2000 MeV noise XT1142 XT1144 M0' workshop

  13. Look at noise correlation • Correlation : • About 50 % on the whole matrix • Correction : • Remove 5x5 matrix around fired crystal • Compute sample average on remaining 74 crystals • Correct all samples event by event • Redo energy reconstruction 1142 M0' workshop

  14. 2002/08/07 2002/08/07 2002/08/23 2002/08/23 Resolution with electron after decorrelation • Single crystal (S1) : ~180 MeV noise (was 250) XT1142 XT1144 M0' workshop

  15. 2002/08/07 2002/08/07 2002/08/23 2002/08/23 Resolution with electron after decorrelation • Sum of 5 crystals (S5) : ~750 MeV noise (was 1250) XT1142 XT1144 M0' workshop

  16. 2002/08/07 2002/08/07 2002/08/23 2002/08/23 Resolution with electron after decorrelation • Sum of 9 crystals (S9) : ~1000 MeV noise (was 2000) XT1142 XT1144 Steps not compatiblewith g33/g9 noise ratio M0' workshop

  17. Conclusions and to-do list • Linearity : • Linearity measurement with laser in good agreement with beam results for E > 50 GeV • Need to understand discrepancy for lower energy • Preliminary results on MC shows lower shower containment in single crystal for low energy particles • Effect of material in front of M0’ ? • Beam calibration ? • Others ? • Noise : • Simple decorrelation algorithm improve resolution for about a factor of 2. • Need to understand G33/G9 noise step • Extra contribution ? • Try S5 and S9 in free gain mode • Calibration : Understand drift with time ! M0' workshop

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