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)
     • Completed: BCAL Threshold Calculation

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

• BCAL Thresholds (David L.)

Minutes

Participants

TBD