Difference between revisions of "March 12, 2023, FCAL Insert Installation Meeting"

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== Agenda ==
 
== Agenda ==
 
* Minutes from last meeting  https://halldweb.jlab.org/wiki/index.php/March_5,_2023,_FCAL_Insert_Installation_Meeting
 
* Minutes from last meeting  https://halldweb.jlab.org/wiki/index.php/March_5,_2023,_FCAL_Insert_Installation_Meeting
−
* Go through updated Gant chart
+
* Go through updated Procedure
−
** [[Media:FCAL2_schedule_v2a.pdf]]
+
** [[Media:FCAL2_module_install_v4.pdf]]
−
** What inspections/marking/labeling/testing needed prior to glass block removal?
+
* Discuss glass and crystal module install, shimming etc... [https://halldweb.jlab.org/wiki/index.php/FCAL_Installation] - Sasha/Malte etc...
−
** Surveys before removal
+
−
** Who is responsible for what?
+
−
* Discuss Lead Glass and crystal module removal/install [https://halldweb.jlab.org/wiki/index.php/FCAL_Installation] - Sasha
+
−
* Manpower and task division [https://halldweb.jlab.org/wiki/index.php/FCAL_Installation] - Sasha
+
 
* Cable update [[Media:FCAL2_lv,board.pdf]]
 
* Cable update [[Media:FCAL2_lv,board.pdf]]
−
* Monitoring system discussion
 
−
* Assembly in ESB
 
−
* 
 
−
[[image:Both_step.jpeg|thumb]]
 
−
[[image:JBweld_cooling_test.jpeg|thumb]]
 
−
[[image:Glass_module_steps.jpeg|thumb]]
 
  
 
== Minutes ==
 
== Minutes ==
−
* Discussed minutes from last meeting
+
* Went over the minutes from the last meeting
−
** what inspections/marking/labeling are needed prior to removal of lead glass blocks?
+
* Significant discussion on shims -
−
*** Malte to come up with a written procedure of what they plan on
+
** Malte has a large number of SS straps from the original modules and will serve as the shims to make up for the difference in module orientation of the lead glass blocks
−
*** Need for good tracking of all modules
+
** Matt Shepherd brought addition SS strap and shim material
−
*** There will be several surveys and measurements for baseline
+
** The original stack up used shims at each step so we should have plenty to reuse if needed
−
*** Sasha wants to minimize rewrapping - needs to come up with a threshold
+
** Discussed shimming the glass/crystal interface to get good and straight, maybe a sheet all around to give a flat surface for the crystals? Also a conductive rubber pad?
−
*** Malte and Mark Dalton wish to be involved in FCAL module dis-assy
+
*** Sasha said the conductive rubber pad on the ComCal is coming apart so we would have to find something more robust.
−
* Going through new version of Gant chart
+
*** Sasha will come up with a stacking sequence for crystals and develop shimming plan for crystals
−
** Matt commented on the fact that some dates do not make sense
+
* Talked about squeezing one glass module row at a time to ensure we get a proper stack - this can be done and the left plate is loosened to allow the next row
−
** Need to update Gant chart with more realistic time frames
+
** If we wish to squeeze the beam right glass modules (1 row at a time) to set up vertical interface with crystals, we can do that with a tool before the crystals (2 rows) are installed
−
** Need to tie Sasha's manpower chart into Gant
+
** The center left cooling plate is being cut into 3 pieces to make it more manageable
−
** Malte making base stress test plan to determine weak base
+
* Malted stated that the  existing signal cables will all be removed by today - we can remove chains in the morning
−
*** to be done in January
+
* We should be ready to pull cables out of dark room next week. Unstacking may start the following week
−
*** prepare stock pile of new bases
+
* Discussed where rtd's go. 10 total on crystals some near center and edges US and DS flanges
−
* Discussed need for written procedures for all aspects of the project
+
* Discussed supporting the lead glass module flange above the crystals on the DS end
−
** Sasha wishes to be responsible for all procedures pertaing to lead glass and crystal modules
+
** May interfere with cabling the crystal bases
−
** He may need some help? Who will do what - This needs to be decided in order for things to go smoothly
+
** Glass modules have housing DS that is smaller than the glass - all load would be put into the first layer joint
−
* Discussed desire to downgrade Hall for GERT only, can ESB be downgraded?
+
** both glass and crystal modules are designed to be supported by the glass/crystal
−
* Discussed the need for a planned quantity of modules to be re-wrapped
+
** Glass Module CG is over crystal so it should be ok
−
** This will be based on Sasha's proposed student manpower for 3 months
+
** Cannot support from end of glass module as housing is plastic
−
** 700 modules to be re-wrapped is the current baseline
+
* Sasha updated that cables are on order
−
** Sasha will obtain materials for many more just in case
+
* Sasha stated that he ordered 200 silicon cookies that match original glass module parameters
−
* Discussed cables
+
* Malte stated that he has spares of the PeeK threaded rods for the glass modules
−
** Sasha Fernando proposed a change to put PCBs at chains for LV
+
* Malte will practice rewrapping of the modules as Matt has brought the fixture and some cut aluminized Mylar
−
*** Proposed horizontal layout will be too crowded
+
* Discussion ensued on the Light Monitoring system - stll no decision on the design and method. We will have a separate meeting
−
*** Will meet in a separate meeting again to decide on this
+
** Time is getting short if we do not wish to hold up the assembly waiting for parts. Need to decide ASAP
−
* Sasha showed a working layout for tables and shelving in hall for lead glass and crystal modules
+
* As found measurements of existing lead glass stack up [[Media:FCAL_module_stack.pdf]]
−
** Concern with stability of free standing shelving
+
** The detector was measured from the outside of the aluminum plates that hold in the modules
−
** Can tie 2 shelves together for stability
+
** Subtract 18.16mm from beam left to take out plate and shim thickness
−
** Modify existing wall shelving for length of lead glass modules
+
** Subtract 19.69 mm from beam right
−
** Need to determine how much existing shelving and what is needed to procure
+
** Subtract  20.19mm from top
−
* Discussed rack and crate layout
+
** Subtract 16.13mm from bottom
−
** Sasha showed his proposed crate layout
+
** Bottom line, the vertical stack is 1.37 mm higher than the expected value and .62 mm wider over 59 modules
−
** Need to strategically place racks for simplified cable paths
+
** Lower half is .66mm more than upper half
−
** Show 3d model of rack layout next meeting
+
** Beam left is .43mm more than BR
−
* Discussed need for mock ups
+
** This may be due to shims being used. We will see when we take it apart
−
** Maybe use ComCal as a mock up for new cabling in January when it is removed from the hall
+
−
** Use lead glass to verify all wrapping /rework procedure so traing can be done well for students
+
−
** Use videos to teach students?
+
−
* Discussed use of 2 scissor lifts instead of big platform upstream of the FCAL
+
−
** Need to demonstrate stability of lift at heights
+
−
** Rent 2nd larger lift with 4 ft extension ($1K / month)
+

Latest revision as of 11:40, 13 April 2023

Meeting Time and Place

Wednesday March 12, 2023 9am At Jefferson Lab, Hall D Counting House and on Zoom

Agenda

Minutes

  • Went over the minutes from the last meeting
  • Significant discussion on shims -
    • Malte has a large number of SS straps from the original modules and will serve as the shims to make up for the difference in module orientation of the lead glass blocks
    • Matt Shepherd brought addition SS strap and shim material
    • The original stack up used shims at each step so we should have plenty to reuse if needed
    • Discussed shimming the glass/crystal interface to get good and straight, maybe a sheet all around to give a flat surface for the crystals? Also a conductive rubber pad?
      • Sasha said the conductive rubber pad on the ComCal is coming apart so we would have to find something more robust.
      • Sasha will come up with a stacking sequence for crystals and develop shimming plan for crystals
  • Talked about squeezing one glass module row at a time to ensure we get a proper stack - this can be done and the left plate is loosened to allow the next row
    • If we wish to squeeze the beam right glass modules (1 row at a time) to set up vertical interface with crystals, we can do that with a tool before the crystals (2 rows) are installed
    • The center left cooling plate is being cut into 3 pieces to make it more manageable
  • Malted stated that the existing signal cables will all be removed by today - we can remove chains in the morning
  • We should be ready to pull cables out of dark room next week. Unstacking may start the following week
  • Discussed where rtd's go. 10 total on crystals some near center and edges US and DS flanges
  • Discussed supporting the lead glass module flange above the crystals on the DS end
    • May interfere with cabling the crystal bases
    • Glass modules have housing DS that is smaller than the glass - all load would be put into the first layer joint
    • both glass and crystal modules are designed to be supported by the glass/crystal
    • Glass Module CG is over crystal so it should be ok
    • Cannot support from end of glass module as housing is plastic
  • Sasha updated that cables are on order
  • Sasha stated that he ordered 200 silicon cookies that match original glass module parameters
  • Malte stated that he has spares of the PeeK threaded rods for the glass modules
  • Malte will practice rewrapping of the modules as Matt has brought the fixture and some cut aluminized Mylar
  • Discussion ensued on the Light Monitoring system - stll no decision on the design and method. We will have a separate meeting
    • Time is getting short if we do not wish to hold up the assembly waiting for parts. Need to decide ASAP
  • As found measurements of existing lead glass stack up Media:FCAL_module_stack.pdf
    • The detector was measured from the outside of the aluminum plates that hold in the modules
    • Subtract 18.16mm from beam left to take out plate and shim thickness
    • Subtract 19.69 mm from beam right
    • Subtract 20.19mm from top
    • Subtract 16.13mm from bottom
    • Bottom line, the vertical stack is 1.37 mm higher than the expected value and .62 mm wider over 59 modules
    • Lower half is .66mm more than upper half
    • Beam left is .43mm more than BR
    • This may be due to shims being used. We will see when we take it apart
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