Difference between revisions of "September 25, 2019 FCAL Insert Design Meeting"

From GlueXWiki
Jump to: navigation, search
(→‎Agenda)
(→‎Minutes and Action Items)
 
(18 intermediate revisions by the same user not shown)
Line 1: Line 1:
 
== Meeting Time and Place ==
 
== Meeting Time and Place ==
  
−
Wednesday Sept 5 1pm
+
Wednesday Sept 25 1:30 pm
 
At Jefferson Lab, room TED 2504
 
At Jefferson Lab, room TED 2504
  
−
* Present - Sasha Somov, Josh Crafts, Vlad, Eugene, Stephanie, Keith Harding, Tim
+
* Present - Sasha Somov, Josh Crafts, Eugene, Stephanie, Keith Harding, Tim, Fernando, Chris Stanislav
  
 
== Agenda ==
 
== Agenda ==
 +
* Action items from last meeting https://halldweb.jlab.org/wiki/index.php/September_9,_2019_FCAL_Insert_Design_Meeting#Agenda
 
* Discuss Center tube
 
* Discuss Center tube
−
** 1mm thick wall minimum. ID is 1.8 cm
+
** 1mm thick wall minimum. ID is 3.8 cm
 
** Upstream end flush with upstream face of acrylic
 
** Upstream end flush with upstream face of acrylic
 
* Discuss Tungsten absorber
 
* Discuss Tungsten absorber
Line 16: Line 17:
 
** Use 1/2" Acrylic sheet with 45 degree angles on edges
 
** Use 1/2" Acrylic sheet with 45 degree angles on edges
 
** How to attach fibers? [[Media:Acrylic_sheet.pdf]]
 
** How to attach fibers? [[Media:Acrylic_sheet.pdf]]
 +
** What size fibers?
 +
** Ok to make test piece as shown?
 
* Cooling of blocks - 2.1 KW needed
 
* Cooling of blocks - 2.1 KW needed
 
** 2 Chillers like those used for BCAL ($16K ea)
 
** 2 Chillers like those used for BCAL ($16K ea)
Line 23: Line 26:
 
** Cooling of inner tube - removable plate
 
** Cooling of inner tube - removable plate
 
** Proposed manifold similar to BCAL
 
** Proposed manifold similar to BCAL
 +
* Support structure and assy sequence
 
* electronics patch panels DS of crystal pmts
 
* electronics patch panels DS of crystal pmts
 
* Discussed Brazing of PMT module straps and new mag field tests
 
* Discussed Brazing of PMT module straps and new mag field tests
 
** Sasha wishes to assemble a new 9 module array for magnetic field testing
 
** Sasha wishes to assemble a new 9 module array for magnetic field testing
 
*** 18mm diameter light guides are needed - josh found some on Amazon - tim will order
 
*** 18mm diameter light guides are needed - josh found some on Amazon - tim will order
−
*** 6mm longer with 50 micron larger ID mag shield steel needed - Submitted to machine shop
+
*** 6mm longer with 50 micron larger ID mag shield steel needed - Submitted to machine shop [[Media:1020_shield.pdf]]
−
*** additional mu metal shields needed (same as previous - 350 microns) - Tim ordered -  
+
*** additional mu metal shields needed (same as previous - 350 microns) - Tim ordered Due Oct 18-  
 
*** Have steel shields annealed - Tim looking into it >900C
 
*** Have steel shields annealed - Tim looking into it >900C
−
 
+
* Discuss test fixture for PMTs in beam
−
== Minutes and Action Items ==
+
** Need to fabricate steel case - [[Media:Steel_shield.pdf]]
−
 
+
−
* Discussed the center support tube
+
−
** Need to determine material for center tube - Sasha
+
−
*** consider magnetic properties, thermal conductivity, strength, stiffness
+
−
** Need to determine the maximum hole size allowable (assume steel initially) - Tim
+
−
** Need to move the upstream end flush with US side of acrylic sheet - Keith
+
−
** Need to decide on size of hole (2x2 crystals now) - Sasha
+
−
* Discussed Monitoring system
+
−
** Use 1/2" acrylic sheet same as FCAL
+
−
** Discussed possibility of pre-assembling the acrylic, fibers and rohacell
+
−
** Determine diameter of fibers - Sasha
+
−
** Layout fibers coming through rohacell and cut angles on acrylic - Keith/Tim
+
−
** Add fibers to inner hole edge
+
−
** Fabricate a test piece - Tim/Keith/Josh
+
−
* Discussed feedthru panels attached to cable support chains
+
−
** Cables are stiff, ok to attach panels to cables with hinge
+
−
** Use ComCal feedthu sizing to develop panels - Keith
+
−
** Cables should be strain relived to chains
+
−
* Discussed cooling system
+
−
** Concept to glue copper tubes to aluminum blocks with thermally conductive epoxy accepted
+
−
** Concept to clamp cooling plates to inner support tube accepted
+
−
** Assuming 2.1KW total heat load, we would need 2 of the chillers used for BCAL.
+
−
** Continue with connections and manifold layou - Keith/Tim
+
−
* Discussed Brazing of PMT module straps and new mag field tests
+
−
** Josh has successfully brazed and cleaned (warm water) an assembly and is testing
+
−
** Test with 2mm cookie to ensure enough pressure can be maintained for good transmission - Josh
+
−
** Sasha wishes to assemble a new 9 module array for magnetic field testing
+
−
*** 18mm diameter light guides are needed - Tim
+
−
*** 6mm longer with 50 micron larger ID mag shield steel needed - Tim
+
−
*** additional mu metal shields needed (same as previous - 350 microns) - Tim
+
−
*** Have steel shields annealed - Tim
+
−
* Discussed test fixutre for PMTs in beam
+
−
** Need to fabricate steel case - Tim
+
 
** need to fabricate support structure - Tim
 
** need to fabricate support structure - Tim
 
** Need to fabricate feedthru panel - Josh/Tim
 
** Need to fabricate feedthru panel - Josh/Tim
 
** need to fabricated aluminum base plate - Josh/Tim
 
** need to fabricated aluminum base plate - Josh/Tim
−
**
+
 
 +
== Minutes and Action Items ==
 +
* Inner Tube
 +
** ok to use 2mm wall
 +
* Acrylic Monitoring sheet
 +
** make 1/2" thick with 6mm bevel on outer edges only
 +
** Drill holes with diamond end mill for polished bottom
 +
** 1mm fiber probably ok
 +
** look at putting a rubber gasket on end flange of modules to prevent cross talk
 +
** make test piece Determine size to fit in dark box 15cm square with 6mm bevel - Tim
 +
* Cooling Manifold
 +
** Need to make sure there is room to replace FCAL module electronics
 +
** Need humidity control in dark room
 +
* Electronics Patch Panels
 +
** Fernando informed us that a 48 wire cable will be used for HV
 +
** HV cables carries 48 individual wires, large bend radius [[Media:Radiall_connector.pdf]]
 +
** PCB mounted connector to bring power from Radiall to individual bases [[Media:SamtekHV.pdf]]
 +
** still need 1600 signal connectors on patch panel using same connectors as ComCal
 +
** Layout separate HV and signal patch panels - Keith
 +
** Determine length of cables - All
 +
* Develop Installation/Assembly sequence for detector - Keith
 +
* Module testing
 +
** Need to verify verify 25um strap is strong enough - Josh
 +
** Procure 1 in-oz torque driver - Tim
 +
** Procure 18mm acrylic light guide - cut and polish - Tim
 +
** Work with Amco 50-50 solder to prove it is good - Josh
 +
** Determine cookie geometry - Josh
  
 
== Action items ==
 
== Action items ==

Latest revision as of 08:18, 9 October 2019

Meeting Time and Place

Wednesday Sept 25 1:30 pm At Jefferson Lab, room TED 2504

  • Present - Sasha Somov, Josh Crafts, Eugene, Stephanie, Keith Harding, Tim, Fernando, Chris Stanislav

Agenda

  • Action items from last meeting https://halldweb.jlab.org/wiki/index.php/September_9,_2019_FCAL_Insert_Design_Meeting#Agenda
  • Discuss Center tube
    • 1mm thick wall minimum. ID is 3.8 cm
    • Upstream end flush with upstream face of acrylic
  • Discuss Tungsten absorber
    • Cover 1.5 crystals ok?
    • Rohacell supported
  • Monitoring System
    • Use 1/2" Acrylic sheet with 45 degree angles on edges
    • How to attach fibers? Media:Acrylic_sheet.pdf
    • What size fibers?
    • Ok to make test piece as shown?
  • Cooling of blocks - 2.1 KW needed
    • 2 Chillers like those used for BCAL ($16K ea)
    • 4 water to air Heat exchangers around crystal area
    • 9 parallel circuits for each chiller
    • potted copper tube into aluminum blocks
    • Cooling of inner tube - removable plate
    • Proposed manifold similar to BCAL
  • Support structure and assy sequence
  • electronics patch panels DS of crystal pmts
  • Discussed Brazing of PMT module straps and new mag field tests
    • Sasha wishes to assemble a new 9 module array for magnetic field testing
      • 18mm diameter light guides are needed - josh found some on Amazon - tim will order
      • 6mm longer with 50 micron larger ID mag shield steel needed - Submitted to machine shop Media:1020_shield.pdf
      • additional mu metal shields needed (same as previous - 350 microns) - Tim ordered Due Oct 18-
      • Have steel shields annealed - Tim looking into it >900C
  • Discuss test fixture for PMTs in beam
    • Need to fabricate steel case - Media:Steel_shield.pdf
    • need to fabricate support structure - Tim
    • Need to fabricate feedthru panel - Josh/Tim
    • need to fabricated aluminum base plate - Josh/Tim

Minutes and Action Items

  • Inner Tube
    • ok to use 2mm wall
  • Acrylic Monitoring sheet
    • make 1/2" thick with 6mm bevel on outer edges only
    • Drill holes with diamond end mill for polished bottom
    • 1mm fiber probably ok
    • look at putting a rubber gasket on end flange of modules to prevent cross talk
    • make test piece Determine size to fit in dark box 15cm square with 6mm bevel - Tim
  • Cooling Manifold
    • Need to make sure there is room to replace FCAL module electronics
    • Need humidity control in dark room
  • Electronics Patch Panels
    • Fernando informed us that a 48 wire cable will be used for HV
    • HV cables carries 48 individual wires, large bend radius Media:Radiall_connector.pdf
    • PCB mounted connector to bring power from Radiall to individual bases Media:SamtekHV.pdf
    • still need 1600 signal connectors on patch panel using same connectors as ComCal
    • Layout separate HV and signal patch panels - Keith
    • Determine length of cables - All
  • Develop Installation/Assembly sequence for detector - Keith
  • Module testing
    • Need to verify verify 25um strap is strong enough - Josh
    • Procure 1 in-oz torque driver - Tim
    • Procure 18mm acrylic light guide - cut and polish - Tim
    • Work with Amco 50-50 solder to prove it is good - Josh
    • Determine cookie geometry - Josh

Action items

Retrieved from "https://halldweb.jlab.org/wiki/index.php?title=September_25,_2019_FCAL_Insert_Design_Meeting&oldid=94403"