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

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

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

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

Integration Packages

Solenoid & BarrelTracking

Cer

enko

v

TO

F

FC

AL

US Package DS PackageFixed Package

Package Access Area Package Access Area

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…

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

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

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

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

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

Possible interference point for DS cable path driven by Cerenkov design and physics acceptance issues…

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

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?

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?

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…