ATLAS Pixel Detector
Beampipe Support Structure
October 2001PST CDR
E. Anderssen, LBNL
October 2001ID Eng
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 TBD
Constraint 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
October 2001ID Eng
E. Anderssen LBNL
ATLAS Pixel Detector
FEA Model – Important Features
Bolt flanges
Sct mount padsEnd Plugs (1 mm equiv. carbon sheet)
Hoop Hat Stiffeners(section view)
30
4510
End Support
End Supports
October 2001ID Eng
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
October 2001ID Eng
E. Anderssen LBNL
ATLAS Pixel Detector
Gravity 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
October 2001ID Eng
E. Anderssen LBNL
ATLAS Pixel DetectorPixel Package Assembly
Service and Beampipe Support
Service and Beampipe Support
Mockup Pixel Frame shown
October 2001ID Eng
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 points
Rails are used only for delivery, not support
mockup
October 2001ID Eng
E. Anderssen LBNL
ATLAS Pixel Detector
Tension/Compression Transmission through structures not services
Clips register to Buttons on Frame and Service/Beampipe support structure
Gaps allow ‘Phi’ offsets of up to +/- 1mm while only 0.25mm longitudinally
October 2001ID Eng
E. Anderssen LBNL
ATLAS Pixel DetectorWire Planes supported by Pulleys
Wires not modeled, beampipe not shown
October 2001ID Eng
E. Anderssen LBNL
ATLAS Pixel Detector
Tubes route cables to BarrelSeparate blocks at Forward end
October 2001ID Eng
E. Anderssen LBNL
ATLAS Pixel DetectorServices Supported By Framework
October 2001ID Eng
E. Anderssen LBNL
ATLAS Pixel DetectorRouting around Support Frame
October 2001ID Eng
E. Anderssen LBNL
ATLAS Pixel Detector
Need to adjust length of Tube or Support Plane location of VI
October 2001ID Eng
E. Anderssen LBNL
ATLAS Pixel DetectorOutside view of patch Panel
October 2001ID Eng
E. Anderssen LBNL
ATLAS Pixel DetectorSection View of patch Panel
October 2001ID Eng
E. Anderssen LBNL
ATLAS Pixel DetectorBarrel End of Support Structure
October 2001ID Eng
E. Anderssen LBNL
ATLAS Pixel DetectorNear term Goals
• Increase detail of PP1/Endplug region• Analysis of Beampipe overhang is needed to
understand if support locations are acceptable• Vibrational performance of Beampipe should be
ascertained– Stiffness of Structure to be analyzed– Beampipe model produced and run with proposed design
• Intend to have hand calculations by mid-November to verify this is right direction
• Look to have first analysis iteration and better endplug detail by end of year—should leave enough time to iterate before beampipe FDR in Feb ‘02