BCAL Readout Segmentation Task group Meeting: June 2, 2011

Meeting Info

Time:

• 11:30 JLab
• 9:30 Regina

Location:

• CC F326-327

Vid-con:

• ESNet 8542553

Agenda

• Review action items from previous meeting
  1. Confirm Sampling fraction number for BCAL (Zisis)
     • Done. Latest number from Stamatis' thesis is 9.5%
     • New number has been committed to calib directory in svn

  2. Decide on proper form of energy correction and recalibrate BCAL GlueX-doc-1301, Plot (Andrei)

  3. Check on status of SiPM cross-talk/after pulse separation (David)
     • Recent value of 15.7% reported for 1μs pulse
     • Spoke with Yi. Earlier measurements indicated ~12% for a 200ns gate.
     • Estimate for 100ns gate may be closer to 10% according to Yi's guess.

  4. Investigate addition to pedestal width due to gain variation of SiPMs in an array (David)
     • Yi pointed out that this will affect the signal width, not the pedestal width.
     • The measured gain variation between tiles is ~4%. Adding this in quadrature increases single PE signal width from 10% to <11%

  5. Update calibDB with most recent values for SiPM and BCAL properties (David)
     • Done 5/31/2011.

  6. Write up and distribute document describing how BCAL threshold is calculated based on event size (David)

  7. Check widths of energy distributions using low threshold and compare with expected (??)

Minutes

Participants

TBD