Beampipe Support Structure

1
Beampipe Support Structure

• October 2001
• PST CDR
• E. Anderssen, LBNL

2
Chain of Support for PST to Cryostat
Side C
Side A
ID Flat Rail
View from topall Tube Supports are Horizontal
and Co-planar
TRT
SCT
PIXEL
SUPPORT
TUBE
Support Positions are shown, But constraint
conditions are Not indicated here.
ID Vee Rail
Properties TBD
Constraint TBD
3
FEA Model Important Features
10
45
End Support
30
Hoop Hat Stiffeners (section view)
Bolt flanges
End Supports
Sct mount pads
End Plugs (1 mm equiv. carbon sheet)
4
Support Conditions of Beampipe

• Beampipe Cruciform Supports align with Stiffest
  part of PSTthe 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

5
Gravity Sag Calculations
Carbon
Glass
 
DY .57 mm
DY 1.6 mm
Whole Tube Sags at ends during operationit is
intended to remove this sag when Reattaching
supports after installation of Forward ID ? Note
Sag is with Package in placemuch less without
6
Pixel Package Assembly
Mockup Pixel Frame shown
7
Rail 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
8
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
9
Wire Planes supported by Pulleys
Wires not modeled, beampipe not shown
10
Tubes route cables to BarrelSeparate blocks at
Forward end
11
Services Supported By Framework
12
Routing around Support Frame
13
Need to adjust length of Tube or Support Plane
location of VI
14
Outside view of patch Panel
15
Section View of patch Panel
16
Barrel End of Support Structure
17
Near 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 yearshould leave enough
  time to iterate before beampipe FDR in Feb 02