Hall D Integration Status

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Hall D Integration Status

• GlueX Collaboration Meeting Indiana University,
• Ravi Anumagalla

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CONTENTS

• Designs are proposed for the extraction of
  CDC/FDC from the Barrel Calorimeter
• KEY ITEMS
• Non-magnetic rails
• Compact
• With stand the design load
• Precision
• Reproducibility
• DESIGN 1
• DESIGN 2

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• Design 1.
• This Design incorporates two Carbon-fiber
  cylinders of 0.5 cm thk
• The CDC is enclosed in a Carbon_fiber cylinder
  running all along the length of 2m
• The second cylinder is 4m long supporting the
  rails for CDC FDC
• Two rails are positioned at 4 Oclock and 7
  Oclock positions

36/48 Modules of B.C
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0.65 0.85
DETAILS OF THE RAILS AND SPACING
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Alignment Pads
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Carbon-Fiber Cylinder
Carbon-Fiber Cylinder
120 cm Dia
120 cm Dia
CDC End Plate
CDC End Plate
9 cm
9 cm
CDC-CARBON-FIBER CYCLINDER ATTACHMENT OPTIONS
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LOAD RATING
1. Casing Track rail Non-magnetic stainless
2. Steel Balls Silicon nitride ceramics 3.
Under seal Nitrile rubber without metal part 4.
End plate 316 stainless steel 5. Ball retaining
band 304 stainless steel 6. End seal 316 SS. 7.
Screw XM7 stainless steel 8. Grease fitting
Brass 9. Grease Shell Alvania EP2 2
Static 4.52 KN Dynamic 4.10 KN
LWH20 series rails from IKO
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Steps Involved In Aligning Rails

1. The 4m cylinder is fitted to the inner face of
   the barrel calorimeter
2. The fixture in aligned to the center wrt a
   reference edge
3. Rails are aligned with fixture in place
4. Both the rails are fixed to precision for a
   desired angle of 120 deg

Alignment fixture
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Carbon Fiber Cylinder

1. The Rails Are Aligned To The Machined Edge Of The
   Fixture
2. The Rails are bolted tightly to the carbon-fiber
   cylinder
3. The fixture is removed once the rails are aligned

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Reference Edge
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1. 5, Bearings are attached to the outer cylinder of
   the CDC
2. An extra rail is used for alignment purpose of
   the sliding bearings
3. The bolts on the bearings are not tightened
   completely, this gives us some

We use the same fixture to align the bearing on
the CDC
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The CDC slides into the B.C
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Rails Attached to the Fiber glass
CDC
Fiber Glass Cylinders with the rails
Barrel Calorimeter
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Deisgn.2
Barrel Calorimeter
CDC
The CDC enclosed in the Fiber Glass Cylinder is
inserted into the Barrel Calorimeter supported by
the rails
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10 layers of ribbon cables, each layer has 61
cables, Total 610 cables have been modeled,
required 540 cables 360 Coax-Ribbon Forward Drift
Cathodes(3mm thk) 180 Twisted pair Ribbon Forward
Drift Anodes (2mm thk)
130 cm (Dia)
120 cm (Dia)
72, ¼ inch ( 24 CDC HV cables
24 FDC HV cables 24 FDC
Gas Connections)
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Barrel Calorimeter
CDC
CDC Cable Connectors
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Design.1 VS Design2
Can accommodate the design load of 1000 kgs Alignment pads can be included for precision alignment Space available for spacing Can accommodate the design load of 1000 kgs Cylinders should be machined precisely Space available is limited
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CONCLUSION

• Two designs are proposed for review
• Bearings/Rails are selected to accommodate the
  weight of CDC/FDC 1000 kg
• Space for the cables is verified, taking into
  consideration the worst case scenario
• Looking into the possibility of building a
  prototype for testing the fixture for alignment
  of rails
• The Carbon-Fiber cylinder can also accommodate
  Orings for avoiding gas leaks from the CDC
  chamber