Hall D Integration StatusGlueX Collaboration Meeting Indiana University,

Ravi Anumagalla

CONTENTS

Designs are proposed for the extraction of CDC/FDC from the Barrel Calorimeter

KEY ITEMS :1. Non-magnetic rails

2. Compact

3. With stand the design load

4. Precision

5. Reproducibility

1. DESIGN 1

2. DESIGN 2

36/48 Modules of B.C

Design 1.1. This Design incorporates two Carbon-

fiber cylinders of 0.5 cm thk

2. The CDC is enclosed in a Carbon_fiber cylinder running all along the length of 2m

3. The second cylinder is 4m long supporting the rails for CDC & FDC

4. Two rails are positioned at 4 O’clock and 7 O’clock positions

0.65 ~ 0.85

DETAILS OF THE RAILS AND SPACING

Alignment Pads

CDC End Plate120 cm Dia

120 cm Dia

Carbon-Fiber Cylinder

9 cm

CDC-CARBON-FIBER CYCLINDER ATTACHMENT

OPTIONS

CDC End Plate

Carbon-Fiber Cylinder

9 cm

1. Casing & Track rail: Non-magnetic stainless 2. Steel Balls: Silicon nitride ceramics3. Under seal: Nitrile rubber without metal part4. End plate: 316 stainless steel5. Ball retaining band: 304 stainless steel6. End seal: 316 SS.7. Screw: XM7 stainless steel8. Grease fitting: Brass9. Grease: Shell Alvania EP2 2

LWH20 series rails from IKO

LOAD RATING

Static : 4.52 KN

Dynamic: 4.10 KN

Steps Involved In Aligning Rails

Alignment fixture

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

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

Carbon Fiber Cylinder

Reference Edge

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

The CDC slides into the B.C

CDC Fiber Glass Cylinders with the rails Barrel Calorimeter

Rails Attached to the Fiber glass

The CDC enclosed in the Fiber Glass Cylinder is inserted into the Barrel Calorimeter supported by the rails

CDC

Barrel Calorimeter

Deisgn.2

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)

120 cm

(Dia)

130 cm (Dia)

72, ¼ inch ( 24 CDC HV cables

24 FDC HV cables

24 FDC Gas Connections)

CDC Cable Connectors

Barrel Calorimeter

CDC

Design.1 VS Design2

1. Can accommodate the design load of 1000 kg’s

1. Cylinders should be machined precisely

1. Space available is limited

1. Can accommodate the design load of 1000 kg’s

1. Alignment pads can be included for precision alignment

1. Space available for spacing

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 O’rings for avoiding gas leaks from the CDC chamber