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ECAL Stability

ECAL Stability. Contacts: Marc Dejardin, Julie Malcles (laser) http://indico.cern.ch/getFile.py/access?subContId=7&contribId=1&resId=0&materialId=slides&confId=92057. 11/7/2014. Laser Stability: context. APD/PN corrected for (see CMS DN-2008/001 for more detail):

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ECAL Stability

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  1. ECAL Stability Contacts: Marc Dejardin, Julie Malcles (laser) http://indico.cern.ch/getFile.py/access?subContId=7&contribId=1&resId=0&materialId=slides&confId=92057 TTF - ECAL Plenary in CMS week 11/7/2014

  2. Laser Stability: context • APD/PN corrected for (see CMS DN-2008/001 for more detail): • PN linearity Laser pulse variation • Selection criteria: • 100 < number of events < 2000 • 25 < laser FWHM < 45 • 200 ADC < amplitude < 4000 ADC • 3 < signal maximum sample < 8 • max amplitude r.m.s.: 10% • max amplitude m3: 40% • max amplitude/PN r.m.s.: 3% • max amplitude/PN m3: 40% • 0.8(0.7) < laser pulse correction < 0.9(0.95) for barrel(endcap) • Two periods have been considered on 2010 data (only the second period shown in this talk, results are comparable): • 130144 ! 132206, 500 h, 500 sequences, red laser and blue laser • 132226 ! 132914, 350 h, 800 sequences, blue laser only 2 11/7/2014

  3. Blue laser APD/PN stability: barrel Stability of the ECAL laser monitoring system. RMS deviation of the quantity APD/PN for the blue laser for EB channels with nominal data quality cuts applied. The most stable of the two reference PNs was used in each light monitoring region. 3 11/7/2014

  4. Blue laser VPT/PN stability: endcap Stability of the ECAL laser monitoring system. RMS deviation of the quantity VPT/PN for the blue laser for EE channels with nominal data quality cuts applied. The most stable of the two reference PNs was used in each light monitoring region. Right half of EE+ has only 1 active PN (instead of 2) for the considered period, this is why there are less stable regions (also seen in PN stability) 4 11/7/2014

  5. Red laser APD/PN stability: barrel (only) Stability of the ECAL laser monitoring system. RMS deviation of the quantity APD/PN for the red laser for EB channels with nominal data quality cuts applied. The most stable of the two reference PNs was used in each light monitoring region. 5 11/7/2014

  6. Test pulse stability: APD Stability of the APD electronics response to a fixed charge injection. RMS deviation of the response for EB channels with nominal data quality cuts applied. 6 11/7/2014

  7. Test pulse stability: PN Barrel approval pendind: need to understand PN regions which do not seem to correlate to the APD/PN stability map Stability of the PN electronics response to a calibrated charge injection. RMS deviation of the response with nominal data quality cuts applied. 7 11/7/2014

  8. History plot for one typical channel History plot of the quantity APD/PN for the blue laser and one typical channel. 8 11/7/2014

  9. Laser pulse correction for one typical channel • Due to different shaping time of the APD and PN, the APD/PN ratio depends on the laser signal variations. • With the information of the laser pulse shape and the SPR signal response we can calculate a correction factor exactly correlated with APD/PN ratio. • The colour of the points gives their time ordering. Correlation between the measured variation of the quantity APD/PN with the expected correction factor computed using the electronics Single Pulse Response and the laser pulse shape information. The colour of the points indicate their time ordering. 9 11/7/2014

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