Petr SICHO - Helsinki Institute of Physics
Petr SICHO - Helsinki Institute of Physics
Petr SICHO - Helsinki Institute of Physics
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Innermost Pixel B-physics layer replacement<br />
– intermediate step on the way to SLHC<br />
• LHC will increase substantially (~2x) its nominal luminosity even before upgrading to<br />
SLHC (scheduled to 2016)<br />
• The innermost pixel layer (B physics layer very probably would not survive with<br />
reasonable tracking efficiency until the LHC/SLHC upgrade (scheduled to 2016)<br />
• Present B layer is not designed for luminosities above L ≈ 2·10 34 cm -2 s -1 (granularity<br />
issue – deteriorating <strong>of</strong> efficiency is starting), stopping to work @ L ≈ 2·10 34 cm -2 s -1<br />
• Present B layer has to be replaced even before SLHC upgrade, probably during<br />
shutdown 2012 (6-8 months, new triplets and first injector to be upgraded)<br />
• Very limited time for substantial R&D!<br />
• Certainly there is not enough time to remove complete “pixel package” to surface<br />
large cool down time expected – human safety issues!<br />
• Very probably new additional B-layer has to be inserted together with new beam<br />
pipe <strong>of</strong> reduced size without removing pixels package out <strong>of</strong> Atlas<br />
• There are not yet final decisions concerning B-layer upgrade/replacement, expected<br />
in coming weeks ….<br />
1/07/2007 IWORID2008, Helsinky 9
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