Hall D Design StatusGlueX Collaboration Meeting JLab,

Ravi Anumagalla

Hall D Components

• Solenoid – Iron yokes – Cryostats– Filler plates

• Veto – Scintillators– Iron plates

• Cerenkov detector – Support Structure– Rails

• Cylindrical Drift Chamber• Forward Drift chamber • Barrel Calorimeter

} Support Structures for maintenance and integration

CDC

FDC Barrel Calorimeter

Iron Yokes

VETO

Cryo Stat

Target

Vertex Detector

More data needed for Cerenkov detector

How is the veto fixed to the upstream end ?

Top View of the HALL

• The Platform is 8 ft from the base

• Supports the extracted components

• Assists in assembling the parts

Detector Platform

• The components are extracted by “4 ft” from each o other to facilitate future maintenance

• The detector requires a “platform” to support the ex t extracted components

• Structures are designed to accommodate the solenoid and the Cerenkov detector

• Rails are provided to move the components backwards for having access to the FDC’s for maintenance

Support Structures

A hole is necessary in the platform to gain access to the upstream veto

Rails are provided to extract the veto in the forward direction

Service Platform

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

CDC

Barrel Calorimeter

CDC Fiber Glass Cylinders with the rails Barrel Calorimeter

Rails Attached to the Fiber glass

A removable access platform is used for maintenance of CDC, target and vertex detector

The temporary platform is supported on the rollers

Alignment features can be included to maintain the precision while extraction/installation

CONCLUSION

• Support structures for the hall D components have been built and drawing are created for fabrication

• Concept extraction mechanisms have been proposed for review

• Need a discussion with the individual subsystem collaborators to verify the geometry of the models in CAD ( Barrel Calorimeter, Forward VETO,CDC, FDC, Target and Vertex Detector)

• Comments and suggestions for improving the Design

Cake Pan

Vacuum Tank Cover

Helium Vessel

Inner Panel

Outer Panel

Intermediate Panel

Support & Side Panels

73 Dia

77.5 Dia

114 Dia

Cross section of coil 2,3,4

All Dimension Are In Inches

Cross section of coil 2,3,4

Hall D thermo-siphon

Barrel Calorimeter

CDC

Pls Refer next slide

Model 2, CDC Extraction

CDC(O.D)=120CM

Barrel Calorimeter(I.D)=130cm

Bottom plate

Top plateRail

Rail Block

An Alternate design, used to extract the Inner components of the detector :

• Plates are bolted to the respective Fiber glass cylinders

• Components are extracted by sliding on the rails

4.87 meters

2 meters

CDC Cable Connectors

Barrel Calorimeter

CDC

Space occupied by the cables

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)

ΔP/ρg = f (L/D) V2/2g