ATLAS Upgrade SCT Inner Detector Barrel end region

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ATLAS Upgrade SCT Inner Detector Barrel end
region Layout, services, Xo and space
envelopes T.J.Fraser UCL, A.Nichols RAL

The impact of services off the ends of the SCT is
being studied as a continuous task from this
early stage so that the design process of the
inner detector layout does not overlook important
considerations. To this end a Materials
spreadsheet has been set up which relates
directly to barrel end drawings. Components such
as cooling pipes, connectors and manifolds, power
bus tapes /cables and optical readout
cables/fibres and interface PCBs can be entered
onto the spreadsheet and added to the drawings.
Both spreadsheet and drawings are updated in
parallel as parameters such as lengths,
diameters, numbers of units and materials etc
change. Initially, all the elements entered are
hypothetical but these will be more realistic as
RD in cooling, power and readout progresses.
Some major concerns at present, which impact on
the barrel end design are no decision on which
services on the cryostat will be reused and which
removed. the huge number of module cooling
pipes (in comparison with current SCT) the size
and location of the readout interface boards.
the SS and LS barrel concept (rather than equal
length barrel staves)
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Plots on current Materials Spreadsheet The
Spreadsheet at present has cooling pipes and
power tapes. Other items will be added as more
information becomes available. Parameters such as
mass, volume, Xo, and total Xo are calculated
and some comparisons with the current SCT can be
made. Variations on all components at the barrel
end will be included in subsequent versions. The
Spreadsheet is designed to work with the
corresponding drawings (X-sections in Z and A0
R/PHI drawings) and will not be changed without
the equivalent changes to the drawings which
consist of X-sections in Z and a barrel end
drawing In R/PHI.