Difference between revisions of "Jan 25, 2011 Calibration/Monitoring"

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(Minutes)
(Minutes)
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## Two-setting operation (low bias for near, high bias for far SiPM flashing) is feasible.   
 
## Two-setting operation (low bias for near, high bias for far SiPM flashing) is feasible.   
 
# LPM board power dissipation: micro-Watt. See George V's notes: [[Media:RadiatedPower.pdf]]
 
# LPM board power dissipation: micro-Watt. See George V's notes: [[Media:RadiatedPower.pdf]]
# Zisis will bounce another idea for the one-setting operation mode.
+
# Zisis presented Anderi's idea for the one-setting operation mode: glue LED to a short (1-2 cm long) SCSF-78MJ fibre, and glue fibre to LG at a suitable angle.  Fibre's numerical aperture acts as a collimator, directing most of the light to the far end.  This may reduce the ratio of near to far to an acceptable level.  Regina will conduct quick measurements to determine if this method is feasible.
# USM should be contacted to send more LGs to Athens (and eventually Regina).
+
# Zisis will contact USM to send more LGs to Athens (and eventually Regina).  Elton will look for a spare SiPM plus board to send to Athens.

Revision as of 00:59, 26 January 2011

Teleconference Time: 09:00 CST (Regina) / 10:00 EST / 17:00 GMT+2 (Athens)

  • ESNET preferred, EVO as a backup

Background information

Action Items

  1. Why was the dynamic range of the APD tested over 20-450? Where there intrinsic limitations? Can it be extended to form a ratio of 400?
  2. Can George calculate the % deviation from linearity on his plot?
  3. Can George verify that the two-setting operation (low bias for near, high bias for far SiPM flashing) is feasible?
  4. What is the approximate power dissipation for each board? (Just LPM since LPCM will be further away).
  5. Zisis will bounce another idea for the one-setting operation mode.
  6. USM should be contacted to send more LGs to Athens (and eventually Regina).

Tentative Agenda

  1. Discuss Action Items.
  2. Review goals/objectives of Monitoring system.
  3. Presentation to CALWG and Collaboration Meeting.

Minutes

Attendees: Christina (Athens), Elton (JLab), Zisis (Regina)

  1. Action Items.
    1. Dynamic range was that of the APD (10-450). Measurements need to be repeated for SiPMs.
    2.  % deviation from linearity: pending.
    3. Two-setting operation (low bias for near, high bias for far SiPM flashing) is feasible.
  2. LPM board power dissipation: micro-Watt. See George V's notes: Media:RadiatedPower.pdf
  3. Zisis presented Anderi's idea for the one-setting operation mode: glue LED to a short (1-2 cm long) SCSF-78MJ fibre, and glue fibre to LG at a suitable angle. Fibre's numerical aperture acts as a collimator, directing most of the light to the far end. This may reduce the ratio of near to far to an acceptable level. Regina will conduct quick measurements to determine if this method is feasible.
  4. Zisis will contact USM to send more LGs to Athens (and eventually Regina). Elton will look for a spare SiPM plus board to send to Athens.