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Monitoring system : lessons from M0’

Monitoring system : lessons from M0’. Contents : Monitoring electronics Laser APD electronics Conclusions & requirements for 2003. Monitoring system description. Monitoring electronics. MEM stability : Use self measurement of Vinj (stabilized at 10 -4 / year)

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Monitoring system : lessons from M0’

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  1. Monitoring system : lessons from M0’ • Contents : • Monitoring electronics • Laser • APD electronics • Conclusions & requirements for 2003 M0' analysis workshop

  2. Monitoring system description M0' analysis workshop

  3. Monitoring electronics • MEM stability : • Use self measurement of Vinj (stabilized at 10-4 / year) • Stability better than 50 mV / 500 mV over 1 month M0' analysis workshop

  4. Monitoring electronics • FE-Asic stability : • Use electronics injection pulse • Rather good stability over 2 months (1/1000 drift) 2002/08/08 M0' analysis workshop

  5. Monitoring electronics • PN stability : • Compare PN0 with PN2 (level1 fan-out) : • Not stable at all (2.5 % over 2 months) ! 2002/08/08 M0' analysis workshop

  6. Monitoring electronics • PN stability : • Look in archives : • Accelerated aging in oven in 2001 • 60-80 degrees • PN2 should have never been put on M0’ ! • Zero quality control on PN diodes at this time. PN1 PN3 2001/03/06 PN0 PN2 M0' analysis workshop

  7. Laser • Energy stability : • Huge variation with time (short term and long term) • “Raison d’être” of monitoring system • OK M0' analysis workshop

  8. Laser • Pulse width stability : • Huge variation with time (short term and long term) • Huge effect on APD/PN0 • Need to be monitored ! d(fppa)/ds Nanogreen laser Particles Quantronix laser nominal Quantronix laser 2002 M0' analysis workshop

  9. APD line • Electronics stability : • Small dependence on T • No problem with present regulation • Dependence with LV : • No significant change in gain up to now • Pedestals affected • Regular pedestal runs • Dependence with VFE mode : • Pedestal affected Free vs Forced mode • Hard to monitor for hidden gains (G9, G5 and G1 in frre mode) • Dependence with laser energy • Pedestals affected • Compute dynamic pedestals • Dependence with laser pulse width • Convolution with FPPA shaping time • Need to monitor laser pulse width event by event M0' analysis workshop

  10. VFE electronics • Electronics stability : • Dependence with HV : • A priori big dependence of APD gain with HV • Need to checked stability of APD response with present HV system • On good channels : s = 1.4/1000 M0' analysis workshop

  11. APD line • Back to crystal 1142 : • Calibration drift by 5-6/1000 in 2 weeks : • Compare with electron runs Calibration runs @ 120 GeV M0' analysis workshop

  12. Conclusions • Monitoring system : • Need to implement an efficient quality control on PN diodes • Electronics very stable but : • Need to clarify pedestal puzzle (fppa 200x) • Need to monitor laser pulse width event by event • Requirement for 2003 • Residual instabilities seems physical • Parasitic irradiations • HV fluctuation ? • Red laser required for next year • To-do : • Reprocess irradiation data with all the correction • Should be able to get S/R curves with PN diodes as only reference • Fine study of HV data M0' analysis workshop

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