Difference between revisions of "March 12, 2023, FCAL Insert Installation Meeting"
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* Discuss glass and crystal module install, shimming etc... [https://halldweb.jlab.org/wiki/index.php/FCAL_Installation] - Sasha/Malte etc... | * Discuss glass and crystal module install, shimming etc... [https://halldweb.jlab.org/wiki/index.php/FCAL_Installation] - Sasha/Malte etc... | ||
* Cable update [[Media:FCAL2_lv,board.pdf]] | * Cable update [[Media:FCAL2_lv,board.pdf]] | ||
+ | |||
+ | == 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 |
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 from last meeting https://halldweb.jlab.org/wiki/index.php/March_5,_2023,_FCAL_Insert_Installation_Meeting
- Go through updated Procedure
- Discuss glass and crystal module install, shimming etc... [1] - Sasha/Malte etc...
- Cable update Media:FCAL2_lv,board.pdf
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