Beampipe Support Structure

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