1. Hall D Design Status GlueX Collaboration Meeting JLab, December 11-13, 2003 Ravi Anumagalla

2. 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

3. CDC FDCBarrel Calorimeter Iron Yokes VETO Cryo Stat Target Vertex Detector

5. More data needed for Cerenkov detector How is the veto fixed to the upstream end ?

6. 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

7. 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

8. Top View of the HALL The Platform is 8 ft from the base Supports the extracted components Assists in assembling the parts Detector Platform

9. 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

10. 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

11. CDCFiber Glass Cylinders with the railsBarrel Calorimeter Rails Attached to the Fiber glass

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

13. The temporary platform is supported on the rollers Alignment features can be included to maintain the precision while extraction/installation

15. 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