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The problem with double event patterns (M. Brusa, K. Dennerl – MPE) EPIC CAL/OPS meeting - MPE

The problem with double event patterns (M. Brusa, K. Dennerl – MPE) EPIC CAL/OPS meeting - MPE. Classification of doubles. SAS 2 Right. SAS 3 Forward. SAS 4 Left. SAS 1 Backward. readout direction. split backward (SAS: „1“). Forward/Backward doubles :

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The problem with double event patterns (M. Brusa, K. Dennerl – MPE) EPIC CAL/OPS meeting - MPE

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  1. The problem with double event patterns (M. Brusa, K. Dennerl – MPE) EPIC CAL/OPS meeting - MPE

  2. Classification of doubles SAS 2 Right SAS 3 Forward SAS 4 Left SAS 1 Backward readout direction split backward (SAS: „1“) Forward/Backward doubles: superposition of “true” doubles and “false” doubles (re-emission during read-out)  cause shifts in energy calibration split right (SAS: „2“) split left (SAS: „4“) split forward (SAS: „3“)

  3. SAS 2/4: (Left/Right doubles) resemble singles in illumination • SAS 1/3: (Forward/Backward doubles) different illumination  the amount of forward and backward doubles vary across the detector

  4. Q0 Q1 • 11 CALCLOSED observations (PN + FF + expo > 20 ks) spanning ~1000 revolutions from #84 to #1105 • Spectra extracted in 120 different positions (30x4 quadrants) for - SINGLES (PATTERN=0) - DOUBLES (PATTERN=1-4) • XSPEC: fit of the MnKα line (5.896 keV) and Al line (1.486 keV) tested against: - different matrices or models used - singles vs. doubles - backward vs. forward - MnKα vs. Al Q2 Q3

  5. Examples of spectra (MnKα, Rev. #572, Q1) Singles (black) D-backward (red) D-forward (green) readout direction

  6. Singles, Q1Single gaussian fit to MnKα REV #84 Mn line (5.896 keV)

  7. Singles, Q1 REV #125 Mn line (5.896 keV)

  8. Singles, Q1 REV #249 Mn line (5.896 keV)

  9. Singles, Q1 REV #429 Mn line (5.896 keV)

  10. Singles, Q1 REV #981 Mn line (5.896 keV)

  11. Singles: different MATRICES used Singles: different MATRICES used • Best fit energy line does not depend on the actual matrix used REV #84

  12. Singles: different MODELS used • Best fit energy line does not depend on the model used REV #84

  13. Singles vs. Double (1 – backward) • REV #84 • Systematic trend • Position of SAS”1” inconsistent with values for the singles Singles (blue) D-backwards (red) readout direction

  14. Singles vs. Double (1 – backward) • REV #125 • Systematic trend • Position of SAS”1” inconsistent with values for the singles Singles (blue) D-backwards (red) readout direction

  15. Singles vs. Double (1 – backward) REV #572 Singles (blue) D-backwards (red) readout direction

  16. Singles vs. Double (1 – backward) REV #857 Singles (blue) D-backwards (red) readout direction

  17. Singles vs. Double (1 – backward)- “detector representation” - REV #84 “Curved shape” wrt singles Singles (blue) D-backward (red)

  18. Singles vs. Double (1 – backward) REV #125 Systematic in all observations

  19. Singles vs. Double (1 – backward) REV #249 Systematic in all observations

  20. Singles vs. Double (1 – backward) REV #309 Systematic in all observations

  21. Singles vs. Double (1 – backward) REV #429 Systematic in all observations

  22. Singles vs. Double (1 – backward) REV #572 Systematic in all observations

  23. Singles vs. Double (1 – backward) REV #605 Systematic in all observations

  24. Singles vs. Double (1 – backward) REV #709 Systematic in all observations

  25. Singles vs. Double (1 – backward) REV #857 Systematic in all observations

  26. Singles vs. Double (1 – backward) REV #981 Systematic in all observations

  27. Singles vs. Double (1 – backward) REV #1105 Systematic in all observations

  28. Singles vs. Double (backward) vs. Double (left) Singles (blue) D-backward (red) Singles (blue) D-left (red) REV #125

  29. Singles vs. Double (backward) vs. Double (forward) Singles (blue) D-backward (red) Singles (blue) D-forward (red) REV #125 No clear trend seen!

  30. Al lineSingles vs. Double (1 - backward) Singles (blue) D-backward (red) REV #125

  31. Mn vs. Al lines (singles vs Double 1- backward) REV #125 Al line MnKα line Smaller amplitude ..but similar shape!

  32. Conclusions/Future developments • Singles: - Mn & Al line energy quite stable (in single observation) - Matrices/models adopted does not affect energy determination • Doubles: - most of problems caused by BACKWARD (systematic trend wrt to singles) - LEFT/RIGHT: similar to singles - FORWARD: no systematic trend… • Amplitude in Al line smaller than in Mn line - Energy AND spatial corrections needed

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