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HF taks & plans for Summer 2009

HF taks & plans for Summer 2009. Kerem Cankocak 19 June 2009. 1. Contribution from the Iowa and turkish institutes to the HF calibration task force in summer 2009 (CERN part) ‏.

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HF taks & plans for Summer 2009

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  1. HF taks & plans for Summer 2009 Kerem Cankocak 19 June 2009 1

  2. Contribution from the Iowa and turkish institutes to the HF calibration task force in summer 2009 (CERN part)‏ 1.  LED vs Bfield for HF. Draft is under preparation Kerem Cankocak (Iowa)‏ 2.  HV Gain curves will be retaken  for all HF PMTs (maybe compare them to old data): Kerem Cankocak (Iowa), Alexi.Mestvirishvili (Iowa) ; continous work (see the slides)‏ 3.  LED + ped stability: Emine Gurpinar (CU), Aytul Adiguzel (U.), Kerem Cankocak (Iowa) work going on. (see the presentations following)‏ 4.  SPE measurements: New runs have to be taken for 3 different HV's: 1150 V, 1250 V and 1350 V. Kerem Cankocak (Iowa), Mithat Kaya (KU.), Ferhat Ozok (Iowa), Kadri Ozdemir (CU.) work going on. (see the presentation following)‏ 5.  Response of PMTs with Crystals in splash data: analysis going on by Kerem Cankocak (Iowa), Alexi.Mestvirishvili (Iowa)‏ 6.  RADDAM:Dilber Uzun (CU.), Kerem Cankocak (Iowa), Jean-Pierre Merlo (Iowa)‏work going on. (see the presentation following)‏ 7.  Detector Diagnostics group activities & HF in Global runs : Sercan Sen (Iowa) , Kerem Cankocak (Iowa); continous work (see the slides)‏ 8. HF sourcing: Alexi.Mestvirishvili (Iowa), Ianos Schmidt (Iowa)‏ --> postphoned 9-) Test beam : July 8'th

  3. HF tasks at the near future (I)‏ Run 81423 with the garage light HFP and HFM are out of garage. HFP is open now. Light leaks should be checked ASAP.

  4. HF tasks at the near future (II)‏ Almost all good SPE runs were taken at HV=1250 V With the optimum LED intensities: HFM: Q1--> 60 Amp Q2--> 45 Amp Q3--> 45 Amp Q4--> 70 Amp HFP: Q1--> 80 Amp Q2--> 70 Amp Q3--> 57 Amp Q4--> 79 Amp HV @ 1150 V HV @ 1250 V We need more runs with proper LED amplitude settings for 1350 V and 1150 V We need lower LED amplitudes for lower HV's

  5. HF tasks at the near future (III)‏ Finalize the Bfield measurements note Mean ratio Mean ratio LED signals from Short fibers run 71220 (4 Tesla) / 67703 (0 Tesla)‏ RMS ratio RMS ratio

  6. Conclusions: • Fringe field at HF ROBoxes in excess to 100 Gauss • Stability of LED(B)/LED(0) (≈ 1) → PMT shielding GOOD • Stability of RADDAM(B)/RADDAM(0) (≈ 1) → RADDAM Fibers not damaged through B field ramp-up/down (despite alarming noises)‏ [hopefully all other HF Fibers OK also; need source data to confirm!]

  7. HF tasks at the near future (IV)‏ (SPEV2/SPEV1 )=(V2/V1) Comparison of gains at different HV Finalize the gain measurements = 5.08

  8. HF tasks at the near future (V)‏ Finalize the PMT with crystals and the HF splash events  A few high energetic events are from LYSO crystals

  9. HF tasks at the near future (VI)‏ PMT response to LED's Rms ~ 13% Single channel LED timing Rms ~ 1% Pin diode rms ~0.3% Recently there were many achivements done for latency loss. The latency is much more stable now. We have to update the PMT stability analysis done in 2007 using the pin diode information and finalize it. Energy of the first tower vs second (phi=19)‏ Energy of the 1st tower (fC)‏ 1200 fc ~ 40 photoelectrons relative width of 14% from photostatistics Energy of the 2nd tower (fC)‏

  10. BACKUP slidesfrom the June 19, 2007 CMS week

  11. LED's from 4 calibration units Pin diode rms ~0.3% PMT Rms ~ 13% Quadrant 1 & Q4have less LED light then Q2 and Q3

  12. Pin diodes mean energy vs Run number External clock after run 403 30% shift due to latency shift

  13. <0..5% Good runs choosen for analysis Pin-diode 1 Rms ~ 1% Pin-diode 2 Rms ~ 2%

  14. PMT's mean energy vs Run number ~2.5% ~1.25% Pin diode lost timing

  15. good runs: all towers PMT distr. normalized with the first run Run 365 Run 375 Mean shift 0.1% rms ~2% Run 390 Run 388

  16. PMT/pindiode normalized with the first run for the first Quadrant (Q1)‏ Mean shift 0.1% rms ~2%

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