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Workshop on Linearity Study in Particle Detection Systems for High-Energy Beams

Explore linearity studies in particle detectors, including electronic and laser injection methods, beam consistency checks, and beam energy computation through crystal intercalibration and dynamic pedestals. Dive into resolution enhancements, noise correlation analysis, and conclusions for future calibration improvements.

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Workshop on Linearity Study in Particle Detection Systems for High-Energy Beams

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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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