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Integration
GlueX Detector Integration Mission:To ensure systems meet or exceed physics driven goals
To ensure that detectors are designed in a sensible way
To ensure they fit together when assembled and function as intended
Collaboration Meeting
December 2003
Eric Scott
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Prior conceptual goals
• Access to any detector package in one shift period
• Access to detector package without removing cables
• Signal cables as short as possible
• Fiber to control room– Limits ground loops
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Considerations from BABAR• Inter-system clearance of 20 mm
– Possible exceptions: parts close to solenoid or mechanically fastened to neighbors…
• Good Neighbor Policy– “No system may pass its problems to its neighbor
without the neighbor’s agreement.”– Such as: Thermal issues – heat put into the solenoid
must be removed.
• Common Services– Insertion Fixtures– Air Conditioning, heating, ventilation ?
http://www1.na.infn.it/wsubnucl/accel/BaBar_old/TDR.html
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Survey Thoughts
• Design detector packages with known external reference points.
• Establish reference convention: – Center of target Z=0 for experiment?– Offset from inside or outside upstream iron
• A realistic “human” reference
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Integration Packages
Solenoid & BarrelTracking
Cer
enko
v
TO
F
FC
AL
US Package DS PackageFixed Package
Package Access Area Package Access Area
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Living with our Solenoid…“Fixed Package”
• Fill the central gaps– Barrel Calorimeter covers them anyway– Reduces fringe field
• What other steel modifications are desirable / necessary?– US end Fringe Field Suppression
possibilities…
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Standard solenoid
Clipped 150 gauss
Upstream end
Solenoid face is at 0
Front gap is open 4 inches, all others are filled
Clo
sed
Sol
enoi
d
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Standard solenoid
Clipped 150 gauss
Upstream end
Solenoid face is at 0
Both ends opened the same amount.
All gaps are filled
Sta
ndar
d S
olen
oid
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Sol
enoi
d w
ith
Pla
te
Standard with 20” X 80” diameter plate located 4” US with a 12” diameter beam hole.
Clipped 150 gauss
Upstream end
Solenoid face is at 0
Both ends opened the same amount.
All gaps are filled
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Sol
enoi
d P
lug
Standard with 20” X 80” diameter Plug ~4” gap with a 12” diameter beam hole.
Clipped at 150 gauss
Upstream end
Solenoid face is at 0
Both ends opened the same amount.
All gaps are filled
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Inside the Barrel“US Package”
• CDC – Part of US package?– Cables out US end
• Planar Drift Modules– Part of US package / independent?– Cables out US or DS end
• DS cable exit – impact on acceptance?
• US volume
Tracking
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Possible interference point for DS cable path driven by Cerenkov design and physics acceptance issues…
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DS of Solenoid“DS Package”
• TOF & LGD– Package slides DS– Appliance concept
• Power & Cooling in
• Data out (Fiber?)
• Cerenkov– Could integrate with TOF & LGD package– Sets the elevation in the hall, should it still?
Cer
enko
v TO
F
FC
AL
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Avoiding the millimeter war…
• Unified CAD database: JLAB – Unigraphics? • Central repository• Maintainer
– One contact person
– One location
– Current source tree available to all
• Establish detector volumes for package groups• Procedure for when conflict arises…• Correlated with simulation geometry?
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One stop Engineering support?
• Who provides the service?
• What are they providing– A check on safety critical points
– Design assistance
– Full design service
• When do we have to have this person / group in place?
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Key near-term issues…• Magnet iron / Fringe field reduction (Shielding)• Experiment / Hall elevation (Cerenkov – other PID tech.)• Rack locations: US front, side, access while beam is on…• Cable / Optical space & paths
– All out front / some out front for inner sled– If some come out the back, acceptance issues?
• Detector interconnects (supports):– Designs must be finished by:______
• Power / Cooling needs and method– Inside magnet (CLEO’s PF-200IG based hydrocarbon coolant farm)
– Outside AC, chilled water…
• Fire detection / Suppression– Inside magnet gas system? (FM 200 – heptafluoropropane?)– Outside dry pipe, power interrupt on alarm – Fire-wire, air sampling – sniffers…
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