SoLID Ecal Weekly 20230413

Discussion on Run List

Mike:

• Runlist: in progress, suggest 4 plots – run condition; Scintillator; Shower; Preshower
• also showed alignment group survey report for 18 deg.
• suggestion: put alignment report and Jimmy’s CAD drawing together to form a technical note.

Discussion on Simulation

• Presentation by Ye
• LASPD waveform study: Note that LASPD covers nearly the full top Shower, but only half of left or right Shower
• 5uA LD2: compare waveform of Shower-Top, LASPD-T and LASPD-B, Some events have LASPD >0, some =0 when pulse is out of time or no pulse.
• 10uA LH2: many pulses overlap
• Q&A (Tim): TS4 timing is determined by ShowerSum, but Ye only plotting Shower-Top, would that make a difference? Jixie: Showers are aligned within 2 windows (8ns)

Discussions on Tracking

• Presentation by Xinzhan
• with grid option, cooking speed is 40 times faster than no-grid option. Grid now using GEM1 and GEM4 (bruteforce scan) to define grid for GEM2 and GEM3. Speed-wise it’s good enough.
• 2D clusters are probably still um-level “off” (incorrect) because chisq is peaked at 0, and xp, yp are tilted for low rate runs but symmetric for high rate runs.
• List of possible optimization
  • using target+GEM4 (or 3) instead of GEM1+GEM4
  • using ECal and/or other detector for constraining so we do not rely completely on chisq minimization
  • correct all offsets
  • could we quote both accuracy and efficiency?

Discussion on Cooking

• Jixie did another round of 18 deg data, next will be after GEM tracking is fully opitimized
• Jixie will cook 82 and 7 deg data, question: 82 deg had 2 working GEMs, could we use target as a 3rd point to reject/select the 2-GEM “tracks”? – need to think about this, would the effort be worth the outcome? Maybe not?