pixel support tube and related
DESCRIPTION
Pixel Support Tube and Related. November 9, 2001 Pixel Day E. Anderssen, LBNL. Overview. Status of Work, technical and other PST and Supports Pixel Supports Service/Beampipe Supports Immediate plans Prototyping in ‘02 Discrepancies All along the way…. +X. +Z. +Y Vertical. - PowerPoint PPT PresentationTRANSCRIPT
ATLAS Pixel Detector
Pixel Support Tube and Related
November 9, 2001Pixel Day
E. Anderssen, LBNL
Nov 2001Pixel Day
E. Anderssen LBNL
ATLAS Pixel DetectorOverview
• Status of Work, technical and other– PST and Supports– Pixel Supports– Service/Beampipe Supports
• Immediate plans– Prototyping in ‘02
• Discrepancies– All along the way…
Nov 2001Pixel Day
E. Anderssen LBNL
ATLAS Pixel DetectorChain of Support for PST to Cryostat
PIXEL SUPPORT TUBE
SCT
TRT
ID Vee Rail
ID Flat Rail
Side C Side A
View from top—allTube Supports are
Horizontal and Co-planar
Properties TBDConstraint TBD
Support Positions are shown,But constraint conditions areNot indicated here.
+Z
+X
+Y Vertical
Agreed Support Positions outside PST
PST Support Conditions Under Investigation
Nov 2001Pixel Day
E. Anderssen LBNL
ATLAS Pixel DetectorSupport Conditions of Beampipe
• Beampipe Cruciform Supports align with Stiffest part of PST—the end flanges
• All support planes on frame are wires allowing longitudinal (axial) float
• One Z-Fixture is foreseen to take up ATLAS Access/Opening loads
Nov 2001Pixel Day
E. Anderssen LBNL
ATLAS Pixel DetectorPixel Support Tube Mockup
• Mockup in three pieces to simulate independent parts of tube– Goal is for full length of entire tube to simulate all installation scenarios– Detector rails are removable, should modification be necessary– Intend to run ‘installation tests’ in ‘02
Nov 2001Pixel Day
E. Anderssen LBNL
ATLAS Pixel DetectorRail Design in Support Tube
Vee and Flat rails were chosen to provide pseudo-kinematic support for the detector during delivery to the support pointsRails are used only for delivery, not support
mockup
Nov 2001Pixel Day
E. Anderssen LBNL
ATLAS Pixel Detector
PST Important Features
Bolt flanges
Sct mount padsEnd Plugs (1 mm equiv. carbon sheet)
Hoop Hat Stiffeners(section view)
30
45 10
End Support
End Supports
Nov 2001Pixel Day
E. Anderssen LBNL
ATLAS Pixel Detector
Flange Face (machined layup)
Flange base(Layup)
Stiffeners(layups)
Support Flange Bonded Assembly
T-nuts(bonded)
Old design - now gone forindependent thermal barrier
Nov 2001Pixel Day
E. Anderssen LBNL
ATLAS Pixel DetectorSlider design - materials testing
• Friction Tester nearing completion– Applies variable pressure– Measures angular acceleration– Slides sample against interchangeable disk of given material
M
slider to be tested
turntable (carbon disk)
position is movable along arm
M
Mass provides normal force
Encoder on shaft measures acceleration
arm hinge
Nov 2001Pixel Day
E. Anderssen LBNL
ATLAS Pixel DetectorGravity Sag Calculations
Carbon Glass
Whole Tube Sags at ends during operation—it is intended to ‘remove’ this sag when Reattaching supports after installation of Forward ID Note: Sag is with Package in place—much less without
Nov 2001Pixel Day
E. Anderssen LBNL
ATLAS Pixel DetectorReaction Loads On SCT
Model Material FX (N)
FY (N)
FZ (N)
MX (Nm)
MY (Nm)
MZ (Nm)
Carbon - 151 0 253 - -
Glass - 53 0 89 - -
Vertical Bending – Both Ends
Both Ends Bent – 1 Z ConstraintModel Material FX (N) FY (N) FZ (N) MX
(Nm)MY
(Nm)MZ
(Nm)Carbon 146 - - - 233 -
Glass 52 - - - 83 -Both Ends Bent – 2 Z Constraints
Model Material FX (N) FY (N) FZ (N) MX (Nm)
MY (Nm)
MZ (Nm)
Carbon 297 - 1870 - 536 -
Glass 108 - 468 - 110 -
One End Bent – 1 Z ConstraintModel Material FX (N) FY (N) FZ (N) MX
(Nm)MY
(Nm)MZ
(Nm)Carbon 390 - - - 623 -
Glass 137 - - - 218 -
Horizontal Bending
Nov 2001Pixel Day
E. Anderssen LBNL
ATLAS Pixel Detector
Flexure Block interface to SCT Penetration
Fx
Fz
Fy
My
Mz
Mx
This interface must take same loads as applied to Flexure—Will know them well afterJoint Model is run
Will look at simple feasibility with current (infinite stiffness) loadsWill iterate size if indicated by ROM calculation
SCT Thermal Barrier
Penetration
Nov 2001Pixel Day
E. Anderssen LBNL
ATLAS Pixel DetectorFlange Envelope
Pixel Support Tube (Barrel Region) Pixel Support Tube (forward)
240
261
242
260
Dimensions from 1:1 ID Layout May ‘01
775
780
765
785
792 796
800795
799
245246
257259.5248
811
251
May changeBy ~5mm to 806new structure added
700
SCT BARREL 3
Barrel Mount Flange
Interlink
SCT Forward Envelope
806
requestedChanges
244
Nov 2001Pixel Day
E. Anderssen LBNL
ATLAS Pixel DetectorFlange Envelope
Pixel Support Tube (Barrel Region) Pixel Support Tube (forward)
240
261
242
260
New Proposed Envelopes—not yet agreed
780
765
792
800799
252
811
251
700
SCT BARREL 3
Barrel Mount Flange
Interlink
SCT Forward Envelope
806
244shim
shim255254
246
Nov 2001Pixel Day
E. Anderssen LBNL
ATLAS Pixel DetectorZ-Flexure (Side A)
Support Tube Mount Pad M55J
ViewDirectio
n
Cut Plane
Insulator (G10) or Al203
Access holeThruService Rail
Gap filledAfterpicture
Dowel pins have line fit
Metal Insert Bonded in
Thermal Barrier squeezed in here
Nov 2001Pixel Day
E. Anderssen LBNL
ATLAS Pixel DetectorPixel Supports
Nov 2001Pixel Day
E. Anderssen LBNL
ATLAS Pixel DetectorPixel Package Assembly
Service and Beampipe Support
Service and Beampipe Support
Mockup Pixel Frame shown
Nov 2001Pixel Day
E. Anderssen LBNL
ATLAS Pixel DetectorTension/Compression Transmission
through structures not services
Clips register to Buttons on Frame and Service/Beampipe support structureGaps allow ‘Phi’ offsets of up to +/- 1mm while only 0.25mm longitudinally
Nov 2001Pixel Day
E. Anderssen LBNL
ATLAS Pixel DetectorWire Planes supported by Pulleys
Wires not modeled, beampipe not shown
Nov 2001Pixel Day
E. Anderssen LBNL
ATLAS Pixel DetectorTubes route cables to Barrel
Separate blocks at Forward end
Nov 2001Pixel Day
E. Anderssen LBNL
ATLAS Pixel DetectorServices Supported By Framework
Nov 2001Pixel Day
E. Anderssen LBNL
ATLAS Pixel DetectorService quarter panels supported by framework
Nov 2001Pixel Day
E. Anderssen LBNL
ATLAS Pixel DetectorNeed to adjust length of Tube or
Support Plane location of VI
Nov 2001Pixel Day
E. Anderssen LBNL
ATLAS Pixel DetectorOutside view of patch Panel
Nov 2001Pixel Day
E. Anderssen LBNL
ATLAS Pixel DetectorSection View of patch Panel
Nov 2001Pixel Day
E. Anderssen LBNL
ATLAS Pixel DetectorBarrel End of Support Structure
Nov 2001Pixel Day
E. Anderssen LBNL
ATLAS Pixel Detector
PST Prototyping Plans• Short Mandrel
– 1 foot long - 1 for glass, 1 for carbon – aluminum or steel– “Dry-run” in autoclave to determine thermal response– Determine final diameters from test layups
• Full Size Mandrel (forward length)– Quotes already received
• Approximately 14,000 to 20,000 USD• 8 Weeks delivery
– Plans to Fabricate forward prototype in glass• All flanges and rail features• Use for production forwards if diameters are correct
• Implications of Glass Forwards/Carbon Barrel on prototyping plans must be more fully assessed
• Insertion Testing
Nov 2001Pixel Day
E. Anderssen LBNL
ATLAS Pixel DetectorPST Prototypes in ETC ‘02
• Includes– Friction Testing– Material Test Panels– “Foot Long” prototypes– End-Plug Prototype estimated as ½ production total
• Gray area– Calling first Forward Tube a prototype—Production monies all in
FY’03, but need to order tooling and start fab in ’02– Missing prototype flexure mounts (as noted in 1.1.1.1.3.5)– Prototype ‘End Plate’ buried in Frame estimate, but included Pixel
mounts (~$5k ’01, $10k ’02)– Monies for assembly testing of Insertion mockup spread over a few
efforts and called ‘testing’ hard to track if appropriate levels have been assigned
Nov 2001Pixel Day
E. Anderssen LBNL
ATLAS Pixel DetectorService Support Prototypes ‘02
• Now includes Beam Vacuum Support Structure• Prototype in ’02 already includes bond fixture—need to
increase cost some to account for additional scope of VI support, but this saves overall by not having entire extra fixture for VI support
• Intention for ’02 to build 1 quarter panel support and 2 service panels—still valid
• Need to build Full VI support for both installation testing and to support services– Needs to be ‘real’ for use in case pixels are late– Needs to have ‘real’ rail interface (unless replaceable interface)
• Need to add cost to this section of WBS, or make new WBS for Beam pipe support
Nov 2001Pixel Day
E. Anderssen LBNL
ATLAS Pixel DetectorRecent Changes and Estimate of Impact
• Change of Forwards to Quartz fiber— +$30k– Additional Shell tool $14-20k– Additional Hat stiffeners ~120-160 Man hours M-tech
• Introduction of Independent SCT Thermal Barrier +$35k– Throw away ~3-4 man months LBL/Junior Eng Design time– Accrue additional 2-3 man months re-design of Flange/Flexures
• Increase in scope to include Beam Vacuum Supports +$110k– Design time not assessed– Attempt to use/re-use as much fixture costs as possible– Estimate ~$25k Material/200hr Shop/300hr M-tech (REAL) ‘03– Estimate ~$10k Material/200hr Shop/300hr M-tech (prototype) ’02– (Est. based on cost of End Plug and fixturing, using same tool as service panel support
structure• PST End Support (former Beam Vacuum Support) not included in cost
estimates yet.• PPI/Endplug Thermal barrier increase in Complexity
– Current Estimate based on segmented flat panel. Cost will increase if tool is needed to make other than a flat shape.