May 17, 2023, FCAL Insert Installation Meeting
From GlueXWiki
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 from last meeting https://halldweb.jlab.org/wiki/index.php/May_10,_2023,_FCAL_Insert_Installation_Meeting
- Status of dis-assembly
- Shimming found to date Media:Shimmap.jpeg
- Frame removal work starting today
- Preliminary Stacking test
- Crystal/glass boundary
- Media:Thermacool.pdf
- Samples in hand (.062" and .035", no glue) - look and feel fine
- Thermal test TBD
- Stacking test ready for crystals
- LMS headway
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.
- Malte gave update that all modules were removed as of yesterday
- 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
- 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
- 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
- 1st row stacked - 15 modules -
- Discussed shimming of existing FCAL
- Ready for crystal stacking test - Sasha, Vlad, Arshak