Difference between revisions of "JEF meeting, August 12, 2022"

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* Simulations/Analysis
 
* Simulations/Analysis
 
** [https://halldweb.jlab.org/wiki/images/b/bd/Glue-jefxd-igal-jaegle-12082022.pdf Updates] -- ig
 
** [https://halldweb.jlab.org/wiki/images/b/bd/Glue-jefxd-igal-jaegle-12082022.pdf Updates] -- ig
 +
* Preparation of parts for FCAL2 modules -- Sasha
 
** [https://halldweb.jlab.org/wiki/index.php/CRYTUR Received all crystals from the second CRYTUR order and 5 crystals from the new order by physics division (expect to receive 150 crystals)].  
 
** [https://halldweb.jlab.org/wiki/index.php/CRYTUR Received all crystals from the second CRYTUR order and 5 crystals from the new order by physics division (expect to receive 150 crystals)].  
 
** Meeting with the DSG group  [https://halldweb.jlab.org/detectors/fcal2/module_fabrication/status/8_5_22/fcal_status_8_2_22.pdf].  Mindy and George will continue working on the project.
 
** Meeting with the DSG group  [https://halldweb.jlab.org/detectors/fcal2/module_fabrication/status/8_5_22/fcal_status_8_2_22.pdf].  Mindy and George will continue working on the project.
 
**[https://halldweb.jlab.org/detectors/fcal2/module_fabrication/status/part_preparation.pdf Preparation of parts][https://halldweb.jlab.org/detectors/fcal2/module_fabrication/status/6_17_22/students1.jpg][https://halldweb.jlab.org/detectors/fcal2/module_fabrication/status/6_17_22/students2.jpg][https://halldweb.jlab.org/detectors/fcal2/module_fabrication/status/6_17_22/students3.jpg]
 
**[https://halldweb.jlab.org/detectors/fcal2/module_fabrication/status/part_preparation.pdf Preparation of parts][https://halldweb.jlab.org/detectors/fcal2/module_fabrication/status/6_17_22/students1.jpg][https://halldweb.jlab.org/detectors/fcal2/module_fabrication/status/6_17_22/students2.jpg][https://halldweb.jlab.org/detectors/fcal2/module_fabrication/status/6_17_22/students3.jpg]
 +
*** Perform quality check of the early fabricated crystals, fix orientation of the PMT and re-wrap some crystals
 
*** Preshaping ESR foils (with the DSG)
 
*** Preshaping ESR foils (with the DSG)
 
*** Wrapping crystals (with the DSG)
 
*** Wrapping crystals (with the DSG)
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*** Cleaning brass assemblies
 
*** Cleaning brass assemblies
 
*** Gluing light guides
 
*** Gluing light guides
**[https://halldweb.jlab.org/detectors/fcal2/module_fabrication/wrapped/wrapped_crytur.pdf Wrapped CRYTUR crystals:] 684
+
** Task for the next week: Perform inventory of all fabricated crystals. Prepare to move to the new lab.
 +
**[https://halldweb.jlab.org/detectors/fcal2/module_fabrication/wrapped/wrapped_crytur.pdf Wrapped CRYTUR crystals:] 682
 
*** <span style="color:#FF0000"> All currently available </span> (consider to borrow some spares from NPS)
 
*** <span style="color:#FF0000"> All currently available </span> (consider to borrow some spares from NPS)
* Preparation of parts for FCAL2 modules -- Sasha
 
 
* Module fabrication  -- Sasha
 
* Module fabrication  -- Sasha
 
** Received 85 PMT housings from Tim, they have been honed by Bobby. All of them will be used today.
 
** Received 85 PMT housings from Tim, they have been honed by Bobby. All of them will be used today.
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*** Work on amending safety docs
 
*** Work on amending safety docs
 
* Light Monitoring System -- Arshak
 
* Light Monitoring System -- Arshak
 +
 +
=Minutes=
 +
Attendees: Igal, Sasha, Tegan, Arsak, Phil, Zisis, Liping, Bill, Jon, Jane, Olga, Azizah, Susan, ST.
 +
* Igal gave an update on his cluster separation studies.
 +
** Showed results from HyCAL analysis showing separation with fairly large efficiency below 2 cm down to 1 cm for the lead tungstate and below 4 cm down to 2 cm for the lead glass blocks using the island algorithm (IA)
 +
*** Liping:  normally incident leptons, not photons
 +
*** Position of incident particle determined using beam profiler
 +
*** Two clusters overlayed
 +
*** Lead tungstate results show obvious step behavior; much less sharp for lead glass
 +
*** This step behavior not seen for simulated CCAL 2-cluster (photon) events, and the efficiency drops off faster as a function of d
 +
*** Both analyses used same algorithm, one in Fortran and one in C++ ported directly from the Fortran code
 +
**** Several hard-coded parameters -- need to be tuned?
 +
**** Other potential differences:  Geant3 vs Geant4 for shower profile?
 +
** Looked at xy positions on modified CCAL -- not all features understood
 +
* Fabrication update
 +
** Received all Crytur crystals from second order + 5 more from pool
 +
** Ordered 50 more, to arrive March/April
 +
** All crystals wrapped, some wrapping for earlier modules have been fixed
 +
** Ran short of strips for brazing, have been ordered
 +
** PMT housing bottleneck, expect more to arrive this week
 +
** Some PCB alignments needed to fixed (need to be vertical)
 +
** Grand total fabricated modules=1153, need to do inventory, prepare shelves for move to new space in EEL (still under construction)
 +
* Arshak working on studying and trying to improve light uniformity over the extent of the plexiglas for the LMS
 +
** Tried different reflectors on wide face of plexiglas
 +
** Still more intense near boundaries
 +
** Try LEDs instead of fibers?  Try more fibers?
 +
** Need to set deadline for going with this approach as opposed to HyCAL method.

Latest revision as of 00:01, 19 August 2022

Meeting time and location:

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

Agenda

Minutes

Attendees: Igal, Sasha, Tegan, Arsak, Phil, Zisis, Liping, Bill, Jon, Jane, Olga, Azizah, Susan, ST.

  • Igal gave an update on his cluster separation studies.
    • Showed results from HyCAL analysis showing separation with fairly large efficiency below 2 cm down to 1 cm for the lead tungstate and below 4 cm down to 2 cm for the lead glass blocks using the island algorithm (IA)
      • Liping: normally incident leptons, not photons
      • Position of incident particle determined using beam profiler
      • Two clusters overlayed
      • Lead tungstate results show obvious step behavior; much less sharp for lead glass
      • This step behavior not seen for simulated CCAL 2-cluster (photon) events, and the efficiency drops off faster as a function of d
      • Both analyses used same algorithm, one in Fortran and one in C++ ported directly from the Fortran code
        • Several hard-coded parameters -- need to be tuned?
        • Other potential differences: Geant3 vs Geant4 for shower profile?
    • Looked at xy positions on modified CCAL -- not all features understood
  • Fabrication update
    • Received all Crytur crystals from second order + 5 more from pool
    • Ordered 50 more, to arrive March/April
    • All crystals wrapped, some wrapping for earlier modules have been fixed
    • Ran short of strips for brazing, have been ordered
    • PMT housing bottleneck, expect more to arrive this week
    • Some PCB alignments needed to fixed (need to be vertical)
    • Grand total fabricated modules=1153, need to do inventory, prepare shelves for move to new space in EEL (still under construction)
  • Arshak working on studying and trying to improve light uniformity over the extent of the plexiglas for the LMS
    • Tried different reflectors on wide face of plexiglas
    • Still more intense near boundaries
    • Try LEDs instead of fibers? Try more fibers?
    • Need to set deadline for going with this approach as opposed to HyCAL method.