Difference between revisions of "May 17, 2023, FCAL Insert Installation Meeting"

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** Frame removal work starting today
 
** Frame removal work starting today
 
* Preliminary Stacking test
 
* Preliminary Stacking test
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** [[Media:compressed.jpeg]]
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** [[Media:thinpad.jpeg]]
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** [[Media:tightscrew.jpeg]]
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** [[Media:torque.jpeg]]
 
** [[Media:Stacktest.jpeg]]
 
** [[Media:Stacktest.jpeg]]
 
* Crystal/glass boundary
 
* Crystal/glass boundary
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== Minutes ==
 
== Minutes ==
−
* Reviewed minutes from previous meeting
+
* Reviewed minutes from last meeting
−
** Malte - shift plan not needed as folks wishing to help can come and inspect almost anytime as there are modules on the table
+
** Discussed shimming of existing FCAL
−
** Using 50 um alum mylar tape is fine. Should use narrower tape for cuts at strap - need to measure thickness to verify
+
*** No shims found until the center stainless steel tube. Shimmed with 1 80um shim where no strap against the tube as expected
−
** Unstacking about 60% complete, only 4 shims thus far as expected at center SS tube
+
*** Shims on edge steps 0.5 to 1.5mm. Was 1.5 mm by design
−
** Malte will separate modules (36) for stack test - Scot to get Radcon to release - tech crew will set up and test fixture
+
*** One of the lower rows had various shims 80 - 160 um?
−
** Sasha stated that Hakov will come in June to help with stacking
+
*** 1st row had 80um every other module
−
** LMS -  
+
*** Module height at some rows varied as much as 350 um with no shims.
−
*** Sasha received some fiber
+
*** looks like it was determined at some point in time it was decided that shimming added no value except at critical areas such as the beampipe
−
*** There is about 12" x 12" x 12" available under FCAL frame at center to accommodate sphere
+
** Malte gave update that all modules were removed as of yesterday - unstacking is complete!
−
*** fibers need 2 cm bend radius
+
** Discussed need for stacking map - will have large printout with orientation and color code (blue or green)
−
*** Sasha/Arshak will supply sketch to see if it will fit at center - otherwise it mus be moved off center
+
** Sasha ordered cable labler
−
* Malte showed the brown modules near center rows - about 1/3 to 1/2 of the module length is affected (2-3 layers around center)
+
** Sasha wishes to assemble cables in ESB - should be fine
−
* Malte and Mark are performing refurb on some modules
+
** Stephanie and Arshak have a basic plan for LMS box and fibers that appears to be workable
−
* Tech crew doing most of the unstacking and inspection this week
+
** Lead Glass module Stacking test in ESB - existing FCAL 40.141 mm per block on average
−
* Others may get involved with inspection
+
***1st row stacked - 15 modules -
−
*after meeting we discussed cable labeler and Eugene approved the purchase ($3.5K)
+
**** 40.164 mm average module width before squeezing
 +
**** 40.111 mm average module width after squeezing less than 3 inch-lbs per screw
 +
**** 53um per module change - 800um for entire row.
 +
**** 40.137 mm ave after release - 26um per module - 390um spring back
 +
*** 2nd row stacked - 21 modules - same block
 +
**** 40.18 mm initial width
 +
**** 40.14 mm final after squeeze 2 in-lbs
 +
*** 1st 2 blocks in 3rd row were placed and fit just right
 +
*** Installed a piece of the 1/32" ThermaCool R10404 on vertical beam left edge and compressed it
 +
**** 3 in-lb torque per bolt, approx. 160 lbs total over 18 sq. inches - 9 psi - 62kPa
 +
**** Was very tight and could not be pulled out with moderate force
 +
**** Probably makes sense to use this pad on beam left side only to take up any cooling shrinkage differential
 +
* Ready for crystal stacking test - Sasha, Vlad, Arshak
 +
* Tim is updating tech version of stacking procedure document

Latest revision as of 09:46, 18 May 2023

Meeting Time and Place =

Wednesday May 17, 2023 9am At Jefferson Lab, Hall D Counting House and on Zoom https://jlab-org.zoomgov.com/j/1619449114?pwd=UFlVQ1dWTGZ0ZkVYSEx5QzE4YUI3dz09&from=addon meeting ID: 161 944 9114 Passcode: 562689

Agenda

Minutes

  • Reviewed minutes from last meeting
    • Discussed shimming of existing FCAL
      • No shims found until the center stainless steel tube. Shimmed with 1 80um shim where no strap against the tube as expected
      • Shims on edge steps 0.5 to 1.5mm. Was 1.5 mm by design
      • One of the lower rows had various shims 80 - 160 um?
      • 1st row had 80um every other module
      • Module height at some rows varied as much as 350 um with no shims.
      • looks like it was determined at some point in time it was decided that shimming added no value except at critical areas such as the beampipe
    • Malte gave update that all modules were removed as of yesterday - unstacking is complete!
    • Discussed need for stacking map - will have large printout with orientation and color code (blue or green)
    • Sasha ordered cable labler
    • Sasha wishes to assemble cables in ESB - should be fine
    • Stephanie and Arshak have a basic plan for LMS box and fibers that appears to be workable
    • Lead Glass module Stacking test in ESB - existing FCAL 40.141 mm per block on average
      • 1st row stacked - 15 modules -
        • 40.164 mm average module width before squeezing
        • 40.111 mm average module width after squeezing less than 3 inch-lbs per screw
        • 53um per module change - 800um for entire row.
        • 40.137 mm ave after release - 26um per module - 390um spring back
      • 2nd row stacked - 21 modules - same block
        • 40.18 mm initial width
        • 40.14 mm final after squeeze 2 in-lbs
      • 1st 2 blocks in 3rd row were placed and fit just right
      • Installed a piece of the 1/32" ThermaCool R10404 on vertical beam left edge and compressed it
        • 3 in-lb torque per bolt, approx. 160 lbs total over 18 sq. inches - 9 psi - 62kPa
        • Was very tight and could not be pulled out with moderate force
        • Probably makes sense to use this pad on beam left side only to take up any cooling shrinkage differential
  • Ready for crystal stacking test - Sasha, Vlad, Arshak
  • Tim is updating tech version of stacking procedure document
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