Hall D Design StatusGlueX Collaboration Meeting

JLab, December 11-13, 2003 Ravi Anumagalla

Hall D Subsystems

• Solenoid – Iron yokes – Cryostats– Filler plates

• Veto – Scintillators– Iron plates

• Cerenkov detector • Cylindrical Drift Chamber• Forward Drift chamber • Replacement of thermal shields in the cryostat• Barrel Calorimeter

} Require

Support Structures &

Maintenance Platforms

Work is being done to support the BC to the iron yokes

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 ?

• 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

Top View of the HALL

• The Platform is 8 ft from the base

• Supports the extracted

components

• Assists in assembling the parts

Detector Platform

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 OD : 120cm

BC OD : 130cm

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