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ALICE stability LEB meeting 21.03.2012 A. Behrens

ALICE stability LEB meeting 21.03.2012 A. Behrens. Stability ALICE cavern. No deep references, cavern floor points or HLS sensor on the detector for stability information

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ALICE stability LEB meeting 21.03.2012 A. Behrens

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  1. ALICE stability LEB meeting 21.03.2012 A. Behrens A. Behrens BE/ABP/SU-EM

  2. Stability ALICE cavern • No deep references, cavern floor points or HLS sensor on the detector for stability information • BUT  during network measurements of cavern wall brackets 2004, 2006 and 2007 and 2012 no significant vertical movements of cavern walls around the L3 magnet have been detected Front viewside A: Survey brackets on L3 foundation • O side • S4C • S6C • C side • Aside • O side • I side • S4M • S6M • L3M • L3C • I side • Top view: Survey brackets at beam level A. Behrens BE/ABP/SU-EM

  3. Vertical position of surveybrackets • Reference measurements: • 17.07.2004 for brackets at beam level • 03.07.2007 for brackets on L3 foundation side A • Coordinate differences within +/- 0.4mm • With respect to survey precision no significant movement can be detected A. Behrens BE/ABP/SU-EM

  4. Current central beampipeside A • Main support structure is Space Frame • Which supports also the TRD detector • TRD installation not yet finished A. Behrens BE/ABP/SU-EM

  5. Stability central beampipeside A • Deformation of support structure due to detector installation • But will be finished in LS1  No stability prediction for future central beampipe by survey experience A. Behrens BE/ABP/SU-EM

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