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H2 upstream XTAX grid connection broken on 05/6/2012

H2 upstream XTAX grid connection broken on 05/6/2012. Pictures here : \cern.chdfsWorkspacessSBANORTHTCC2PhotosH2upstream XTAX grid connection broken on 20120605. How it should be. Grid down. Broken rotule. Broken part . Environment detail. Mechanical analysis : adjustment.

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H2 upstream XTAX grid connection broken on 05/6/2012

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  1. H2 upstream XTAX gridconnectionbroken on 05/6/2012 Pictureshere: \\cern.ch\dfs\Workspaces\s\SBA\NORTH\TCC2\Photos\H2upstream XTAX grid connection broken on 20120605

  2. How itshouldbe

  3. Grid down

  4. Broken rotule

  5. Broken part

  6. Environmentdetail

  7. Mechanicalanalysis: adjustment • X towards EHN1, Y towards Jura, Z Up Z X Y

  8. Mechanicalanalysis: degree of freedom • X towards EHN1, Y towards Jura, Z Up Z X Y • 2 degrees of freedom are missing in the system

  9. Rotule data sheet

  10. Mechanicalanalysis: rupture load • M8 rupture load (shear mode): σr= 240 Mpa, As= 38 mm2 10kN • Stress in function of beam offset: f=159.PL3/I • (L = 3 m, P = 10 kN) • Hard to believethisfailure mode • Failure of a swith on the gridshouldbeinvestigated (rupture by traction then: tests on a sparegrid)

  11. First idea for new design

  12. Check in TCC2 • Laser scan: check verticality of the beams • If not possible, survey of beam motion on full range (sticker) check verticality • Remove broken part + analysis (shear or traction rupture) • Check offset, install new connection and adjust via 4 holes • Check grid

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