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