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  1. News on time calibration Collaboration Meeting Amsterdam, 22-26 Nov 2010 Agustín S. Losa IFIC (CSIC – Universitat de València)

  2. Outline • OB system status • The new time calibration • Autobinning: Increasing chances for a goodfit • Intra-Line calibration: T0s • “Old way” vs “Automatic Calculation” • First floors calibration • Inter-Line calibration: Time offsets • Laser OB • LED OB • Conclusions • To-Do List Agustín S. Losa – AmsterdamCollaboration Meeting

  3. Status of the OB system • Current list of Optical Beacon not working • LED: L11F2, L11F21, L12F15 Laser: L7F0 • No new dead OB, after the reconnection of lines 6 and 9 • OB of L10F2 recovered • Reminder: Optical Beacon of line 9 on floor 21 needs “EN_ACQ =0” when this Beacon is not flashing • Specialbeaconforopticalpropertieson L6F2 works: • The 6 LEDs of the TOP group emit light at 385, 400, 440, 470, 505and 518 nm • New RunSetups for OB runs have been created after the reconnection, still LED calibration runs no taken • New RunSetups for OB runs will be created beforeHV tunning Agustín S. Losa – AmsterdamCollaboration Meeting

  4. “Old way” T0 Calculation (Reminder) Line 1 Flash OMs by an optical beacon Plot the distribution of hit arrival times for each ARS Fit such distribution with a Gaus or Gaus @Exponential function Determine Tpeak , the time of the function peak storey 21 storey 15 storey 9 storey 2 T0 = ClockPhase + TPeak Agustín S. Losa – AmsterdamCollaboration Meeting

  5. “Old way” vs “Autobinning” Create a histogram with 0.2 ns bins NEW Choose binning • So far the analysis of data to extract the T0 have been carried on “manually” in an iterative way • With the new method, refitting with different bin size of the 1800 histograms is made automatically and human inspection is replaced by a visual quick cross-check of 30 images per sector. Fill this histogram Fill histogram Fit this histogram with a Gaus@Expo Fit histogram Autobinning Increase histogram bin size by 0.2 ns No Visual Inspection: Success Bin Size > 4 ns No Yes Yes Choose the binning which maximizes PFit with 0.08 < PFit < 0.95 Exit Agustín S. Losa – AmsterdamCollaboration Meeting

  6. Autobinning: Increasing chances for a goodfit • Fit all the time histograms with an automated method: • Fit to the convolution of a Gaussian and an exponential • Try different bin sizes (from 0.2 ns to 4 ns, in 0.2 ns steps) • Choose the fit with the best P(χ²) • This method increases significantly the odds to have a good fit notautobinned (0.2ns) autobinned (1.4ns) Agustín S. Losa – AmsterdamCollaboration Meeting

  7. Autobinning: Increasing chances for a goodfit • Final fitusing a colourcodetohelp in the visual check: • Yellow • Fitted more than 50ns Red Max statistic < 50 hits Purple OB-OM angle > 120° • Cyan • Different amplitudes >75% Brown (hits-signal / flashes) < 0.01 Green(Blue ) OK (hits-signal / flashes > 1) Agustín S. Losa – AmsterdamCollaboration Meeting

  8. ARS0 Example of visual checkfor sector #3 of line 2 flashedfromthe L07 F15 ARS ARS1 F13 OM1 ARS2 L1 L2 ARS3 L5 L3 L4 L6 ARS4 L9 L7 L8 L10 L11 L12 ARS5 F11 F12 F13 F14 F15 Agustín S. Losa – AmsterdamCollaboration Meeting FLOOR

  9. The new time calibration • Intra-Line • T0s • Scheme of theautomaticcalibration: • Humaninterventiononlyneeded at theend of theprocesstocheckthe output • runfile & calibration (time & alignment) • Build time OB-OM histograms • Tpeak • Inter-Line • Time offsets • Processingrun • Autobinning Agustín S. Losa – AmsterdamCollaboration Meeting

  10. Intra-Line(obtaining new T0s) • Use theobtained T100s byautobinningtocalibrateby “sections” (≠sectors): • Earlyphotonregion • Section #1: Floors4-10 withthe OB onfloor 2 • Section #2: Floors11-16 (11-17) withtheOB onfloor9 • Section #3: Floors17-22 (17-23) withthe OB onfloor 15 • Section #4: Floors 23-25 withtheOB onfloor 21 • Photoelectronlevelregion(understudy) • Section #0: Floors1-3 (1-8) withanOB of other line (Laser or LED) Agustín S. Losa – AmsterdamCollaboration Meeting

  11. Intra-Line Example of sections #1-4 for line 1(2 runs of 25/02/08, period of 10L) Section #1 Floor4-10 Section #2 Floor 11-16 (11-17) Section #3 Floor 17-22 (17-23) Section #4 Floor 23-25 Agustín S. Losa – AmsterdamCollaboration Meeting

  12. Intra-Line“Old way” vs “Autobinning” Comparison of bothmethodswiththe distribution of the T0s obtained by the “Old way” minus the ones obtained by the “Autobinning” in the period 10L. Only 24 out of 914 show a difference bigger than 1 ns. Agustín S. Losa – AmsterdamCollaboration Meeting

  13. Intra-Line CalibratingtheSection #0: LEDs vs Laser Laser OB ( L8 F0 ) LED OB ( L2 F2 ) L1 L1 L2 L2 L5 L5 L3 L3 L4 L4 L6 L6 Line 1 L9 L9 L7 L7 L8 L8 L10 L10 Example of a comparison (same set of runs as before) of line 1 section #0 calibrationwith L2F2 LED OB and Laser Beaconon line 8 L11 L11 L12 L12 Agustín S. Losa – AmsterdamCollaboration Meeting

  14. Inter-Line(Time offsetsbetweenlines) • Foreachfitted OB, Laser or LED, T100s are analyzed • Possibilitytostudytheevolution in time alongthegivenperiod • Allavailable Laser and LED calibrationruns in a givenperiod can beused • Possibilityto use the LED OB as a cross-checkforthe time offsets (understudy) • Thewholecomputing time in my PC isabout ~1 day per period • The short-termgoalisto compute time offsetsforalltheperiods: #1 #2 #3 #4 #5 #6 #7 5 Lines 10 Lines 12 Lines HV L10-L12+offsets HV 29/Jan/2007 07/Dec/2007 30/May/2008 13/Aug/2009 07/Nov/2009 13/Nov/2009 13/Jul/2010 Today ~10 months ARS_T0_VERSION 10.746.202 • ~7 months • ARS_T0_VERSION • 16.703.026 • 54.497.693 • ~15,5 months • ARS_T0_VERSION • 16.722.429 • 54.497.694 • ~3 months • ARS_T0_VERSION • 35.045.036 • 55.212.410 • ~5 days • ARS_T0_VERSION • 36.934.336 • ~8 months • ARS_T0_VERSION • 37.347.048 • ~4,5 months • ARS_T0_VERSION • 53.408.684 • Duration • ARS_T0_VERSION • NO OFFSETS • WITH OFFSETS Agustín S. Losa – AmsterdamCollaboration Meeting

  15. Example of inter-line with Laserforthe time offsets of period 10L Line 1 L1 L1 L2 L2 L5 L5 L3 L3 L4 L4 L6 L6 Line 2 L9 L9 L7 L7 L8 L8 L10 L10 L11 L11 L12 L12 Agustín S. Losa – AmsterdamCollaboration Meeting

  16. Example of inter-line with Laserforthe time offsets of period 10L Line 8 L1 L1 L2 L2 L5 L5 L3 L3 L4 L4 L6 L6 Line 10 L9 L9 L7 L7 L8 L8 L10 L10 L11 L11 L12 L12 Agustín S. Losa – AmsterdamCollaboration Meeting

  17. Inter-Line“Old way” vs “Autobinning” Comparison of bothmethodsforthe time offsets of period 10L, made with 12 Laser runs from 25/02/2008 to 12/05/2008 Agustín S. Losa – AmsterdamCollaboration Meeting

  18. Example of inter-line with LED-OB 1025 (L9 S2)withonlyonerun (OB 1081) (25/02/08) Line 1 L1 L1 L2 L2 Line 2 L5 L5 L3 L3 L4 L4 L6 L6 L9 L9 L7 L7 L8 L8 L10 L10 L11 L11 L12 L12 Agustín S. Losa – AmsterdamCollaboration Meeting

  19. Conclusions • The new automated method for the time calibration is ready. • The method searches the best bin size to fit the hit arrival time distributions automatically. • More than 1800 histograms fitted. • The method is fast and reduces significantly visual inspection. • Results are compatible with the “old way” method. • No dead OB after reconnection and recovery of the L10F2 • Special beacon for optical properties on L6F2 works and is ready. Agustín S. Losa – AmsterdamCollaboration Meeting

  20. To-Do List • Intra-Line calibration: • Apply automatic method to all the LED calibration sets • Compute new T0s after HV tuning • Study unstable PMTs • Calibrate the first floors • Inter-Line calibration: • Obtain time offsets for all periods • Study time offsets evolution along all periods • Use LED-Beacons as a cross-check for the time offsets • Start to use the Special beacon for optical properties on L6F2 with different wavelengths and the Nanobeacons on L9F1 Agustín S. Losa – AmsterdamCollaboration Meeting

  21. Thankyou foryourattention

  22. PLEASE STAND BY BACK UP

  23. Laser OB – Offsets 10L

  24. Laser OB - Offsets • One only run

  25. Line 1 -1.0ns Line 2 L1 L1 L2 L2 L5 L5 L3 L3 L4 L4 L6 L6 L9 L9 L7 L7 L8 L8 L10 L10 L11 L11 L12 L12 A. S. Losa – AmsterdamCollaboration Meeting -1.0ns

  26. Line 3 -1.0ns Line 4 L1 L1 L2 L2 L5 L5 L3 L3 L4 L4 L6 L6 L9 L9 L7 L7 L8 L8 L10 L10 L11 L11 L12 L12 A. S. Losa – AmsterdamCollaboration Meeting -1.0ns

  27. Line 5 -1.0ns Line 6 L1 L1 L2 L2 L5 L5 L3 L3 L4 L4 L6 L6 L9 L9 L7 L7 L8 L8 L10 L10 L11 L11 L12 L12 A. S. Losa – AmsterdamCollaboration Meeting -1.0ns

  28. Line 7 -1.0ns Line 8 L1 L1 L2 L2 L5 L5 L3 L3 L4 L4 L6 L6 L9 L9 L7 L7 L8 L8 L10 L10 L11 L11 L12 L12 A. S. Losa – AmsterdamCollaboration Meeting -1.0ns

  29. Line 9 -1.0ns Line 10 L1 L1 L2 L2 L5 L5 L3 L3 L4 L4 L6 L6 L9 L9 L7 L7 L8 L8 L10 L10 L11 L11 L12 L12 A. S. Losa – AmsterdamCollaboration Meeting -1.0ns

  30. LED OB - Offsets • One only run

  31. Line 1 Line 2 L1 L1 L2 L2 L5 L5 L3 L3 L4 L4 L6 L6 L9 L9 L7 L7 L8 L8 L10 L10 L11 L11 L12 L12 A. S. Losa – AmsterdamCollaboration Meeting

  32. Line 3 Line 4 L1 L1 L2 L2 L5 L5 L3 L3 L4 L4 L6 L6 L9 L9 L7 L7 L8 L8 L10 L10 L11 L11 L12 L12 A. S. Losa – AmsterdamCollaboration Meeting

  33. Line 5 Line 6 L1 L1 L2 L2 L5 L5 L3 L3 L4 L4 L6 L6 L9 L9 L7 L7 L8 L8 L10 L10 L11 L11 L12 L12 A. S. Losa – AmsterdamCollaboration Meeting

  34. Line 7 Line 8 L1 L1 L2 L2 L5 L5 L3 L3 L4 L4 L6 L6 L9 L9 L7 L7 L8 L8 L10 L10 L11 L11 L12 L12 A. S. Losa – AmsterdamCollaboration Meeting

  35. Line 9 Line 10 L1 L1 L2 L2 L5 L5 L3 L3 L4 L4 L6 L6 L9 L9 L7 L7 L8 L8 L10 L10 L11 L11 L12 L12 A. S. Losa – AmsterdamCollaboration Meeting

  36. Use of LED OB (understudy) • (*) These time offsetshavebeenobtainedwithlowstatistics Agustín S. Losa – AmsterdamCollaboration Meeting

  37. Inter-Line(Time offsetsbetweenlines) • ForeachfittedOBs, Laser or LED (understudy), T100s are analyzed • One set of time offsetsvaluesobtainedforeach OB: posibility of combine allthatinfoforanunique time offsets (understudy) • Posibilitystudy of evolution in time alongthegivenperiod (understudy) • Allavailable Laser runs (LED calibrationrunsalsounderstudy) in a givenperiod can beused • Thewholecomputing time in my PC isabout ~1 day per period • The short termgoalisto compute time offsetsforalltheperiodswithoutthem (blueones): #1 #2 #3 #4 #5 #6 #7 5 Lines 10 Lines 12 Lines HV L10-L12+offsets HV 29/Jan/2007 07/Dec/2007 30/May/2008 13/Aug/2009 07/Nov/2009 13/Nov/2009 13/Jul/2010 Today ~10 mounths ARS_T0_VERSION 10.746.202 • ~7 mounths • ARS_T0_VERSION • 16.703.026 • 54.497.693 • ~15,5 mounths • ARS_T0_VERSION • 16.722.429 • 54.497.694 • ~3 mounths • ARS_T0_VERSION • 35.045.036 • 55.212.410 • ~5 days • ARS_T0_VERSION • 36.934.336 • ~8 mounths • ARS_T0_VERSION • 37.347.048 • ~4,5 mounths • ARS_T0_VERSION • 53.408.684 • Duration • ARS_T0_VERSION • NO OFFSETS • WITH OFFSETS 2007:OFF:V2.1 2008:V2.7 2008:V2.9 2009:V3.0 2009:L12:V6.0 L8clock 2009:V3.1 2010:V3.1 ------------ Agustín S. Losa – AmsterdamCollaboration Meeting