Pixel Support Tube Design Progress and History

Below are the initial layout information and discussions for the Design of the Pixel Support Tube.  Links to requirements documents and analysis results will be posted as they become available.  History and the origin of the Insertable Pixel System will be added to this page shortly.  For completeness, I have included links to Analysis done by Joel Cugnoni of EPFL Lusanne on the SCT Barrel.



Interface to the SCT and Inner Detector

These are documents prepared for a discussion with fellow ID Engineers at CERN on 29-May-01.  The include descriptions of the Support Condition and Design of support Blocks of the Pixel Support Tube (PST).  The discussion focused on the interface to the SCT, but included the Forward End supports and Flange design as these affect loads and load transfer to the Barrel ID via the SCT interface.

Barrel Z-Flexure Sketch  

Layout of Interface to SCT

Flexure rough dimension

Support Condition of Inner Detector

Discussion of SCT Interface

Desired Support Condition

SCT Reference Information

SCT Barrel Analysis Reports as of May-29-01

Final Report Summary

The links below are to pdf's of the Analysis done by Joel Cugnoni of EPFL Lusanne on the SCT--these are were generated from documents downloaded from his webpage on analysis results from design study performed for E Perrin of Uni Geneve on the SCT Barrel .    For the latest results, Eric Perrin  at the University de Geneve should be contacted.

Summary Report by J Cugnoni

Full Report by J Cugnoni

Excel Spreadsheet of Results (in French).  (XML version--use tabs at bottom to see more sheets) 

Presentation given by Joel at SCT Barrel Structures FDR

SCT  Barrel Drawings used to design Pixel Support Tube inteface to SCT

This drawing requires an HPGL viewer to look at it.  It was issued in the Call-for-Tender of the Barrel SCT and was produced by Universite de Geneve for the Barrel FDR.  Controlled versions are accessible in the ATLIS Node of CDD.  Barrel-3 is the innermost SCT barrel--Pixel Barrels are numbered 0, 1, and 2, starting at the B-Layer.

The version here is currently marked for revision in CDD, and will be updated there.  This version was used as it represents the current best understanding of the geometry, and will be kept here as reference to the above discussion.

The interface to the interlink is likely to change to improve its stiffness and it is also likely that the PST interface will require additional (independant) bolt holes.  The dowel pins will still be shared.

 



Pixel Support Tube Components

Z-Flexure on Side A of the Barrel Pixel Support Tube

The hole in the support pad is for the as-yet-designed Pixel Mount.  This mount will penetrate the PST through the Service Rail and Support Pixels.  It is bonded to the Mount Pad from the outside.  A sketch of the Z-Flexure, and some results of analyses are available above.

PST-Fixed Barrel Mount

Fixed-Mount on Side C of the Barrel Pixel Support Tube

The hole in the support pad is for the as-yet-designed Pixel Mount.  This mount will penetrate the PST through the Service Rail and Support Pixels.  It is bonded to the Mount Pad from the outside.  A sketch of the Z-Flexure, and some results of analyses are available above.

 

Pixel Support Tube Barrel Region (w/SCT Supports)

The brackets and bosses which appear to hover around the periphery of the flanges are attached to the SCT Barrel-3 Flange which, along with the rest of the SCT, has been blanked for this view.  Part of the Barrel-PST flange has been cut away.  The Service Rails and Mount Pads are clearly visible in this view.