Latest revision as of 22:22, 11 August 2022

Meeting time and location=

• 9:30 am EST (JLab time) remote only
• Zoom meeting ID: 161 050 9142 Passcode: 004965

Agenda

• Simulations/Analysis
  • New IA vs old IA -- ig
• Preparation of parts for FCAL2 modules -- Sasha
  • Received 25 crystals from CRYTUR (last from our 2nd order).
  • Meeting with the DSG group [1]. Mindy and George will continue working on the project.
  • Preparation of parts[2][3][4]
    • Preshaping ESR foils (with the DSG)
    • Wrapping crystals (with the DSG)
    • Preparing Silicon cookies
    • Module fabrication
    • Cleaning brass assemblies
    • Gluing light guides
  • Wrapped CRYTUR crystals: 664
    • All currently available (consider to borrow some spares from NPS)
• Module fabrication -- Sasha
  • Received 85 PMT housings from Tim, they have been honed by Bobby. All of them will be used today.
  • Status of fabrication
  • Fabricated modules: Total 1121
    • All SICCAS 577 SICCAS
    • 544 CRYTUR, Remaining: 133
  • Clean room EEL126 [5][6]
    • Expect to move to the new lab EEL108 (the same building) [7]
    • Work on amending safety docs
• Light Monitoring System -- Arshak

Minutes

Attendees: Phil, Tegan, Zisis, Liping, Jon, Olga, Jane, Susan, Sasha, S.T.

• Simon presented slides by Igal that compared the performance of the new implementation of the Island Algorithm (IA) for FCAL1/2 to the default (DA) FCAL1 algorithm
  • Looked at close clusters with one cluster energy fixed and varying energies of the second cluster, measuring the separation for the cases where 2 showers were returned by the reconstruction code
    • The maximum efficiency, especially for the FCAL1 case, is measurably lower than one for all separations (probably due to material before the FCAL)
    • For IA, the separation at which the efficiency drops off for smaller separations depends on the relative energy between the two clusters
    • The log-weighting method does not work properly for either DA or IA
    • The center-of-gravity weighting method for DA leads to multiple humps in the reconstructed separation distribution for FCAL2
  • Igal also looked at separations using the CCAL shower code with a large CCAL replacing the FCAL
    • log- and center-of-gravity weighting look the same
    • Sees a bias away from true separations at lower separations
    • Maximum efficiency higher than FCAL1/2 results; could be due to material
    • (After the meeting) results don't seem to agree with previous results from Ilya using HyCAL data
• Preparation/Construction of FCAL2 modules continues
  • Received 25 modules from Crytur, expect more in the future, ~50 /month
  • Light guides coming next month
  • PMT housings arrived
  • Brass straps no longer bottleneck
  • 664 Crytur crystals now wrapped
  • Grand total of fabricated modules up to 1121
    • Have components for module fabrication for 33/133 remaining crystals
• Plan to move to new area in EEL, currently not ready
• PMT dividers will be ordered next fiscal year
  • NPS see noise issues, but they are using a larger amplifier gain than we anticipate
  • GWU to help out with divider studies
• Plan to meet with Tim regarding installation schedule for next year
  • Frame design finalized
  • Also need to discuss cabling with Fernando -- thickness of cables, stress relief
• Refurbishment of lead glass blocks, Cockroft-Walton bases?
• Budget for next year needs to include money for LMS, also spare crystals?