Mechanical precision and vibration behavior of mechanical supports Johan Wickström GFA-ATK Team: Wolfgang Burkert, Haimo Jöhri, Uwe Barth
PSI XFEL LAYOUT BRIDGE AARE
SETUP of Mechanical structures 250 MeV COMPONETS SUPPORTS GIRDER JACKS FLOOR
SETUP of Mechanical structures General stability of component structure COMPONETS precision from alignment driving wedge or distance block 0.01mm SUPPORTS machined precision longitudinal 0.01mm/1m vertical +-0.1mm GIRDER JACKS pre positioning +-1mm FLOOR floor unlevel +-10mm
Girder Dimension 250 MeV 820mm/ 920mm 1200mm 4700mm 820mm 570mm mass 3800kg /4400kg
Girder Dimension Fabrication
Girder Jack • Spherical contact head • Vertical adjustment • Horizontal adjustment • 1 turn = 0.3mm • Standard driving wedge • Compact and massive design • Fixation of movement possible J.Haimo
Support for Components Reference area Clamping element Distance block or Driving wedge Screw for lifting J.Haimo
Driving Wedge Height: 20mm +/- 0.5mm 1 turn = 0.1mm adjustment of height Scale : 0.1mm / mark Scale : 0.01mm / mark Footprint : 38 x 65mm J.Haimo
design Today 250 MeV – PSI XFEL Why mineral Cast ? • high damping properties expected, non homogenous material • relatively high mass vs. load change good for many setups • cost effective in mass production (no high temperature) about 3 weeks delivery with existing mould • one wooden mould gives ~10 girders • one steel mould gives +100 girders • surfaces can be grinded >> precision 0.01mm/1m length • no local stresses introduces by machining WEAK Points • fragile edges - corners • minimal wall thickens +80mm • mould costs during prototyping • unknown factors?
Eigenfrequency analysis of mechanical supports • estimate eigenfrequency and deformations of girder • 3 feet or 4 feet solution considered • several feet locations considered • target eigenfrequency above 40 Hz • sacking deformation of low relevance since machining done on support points • sacking from 10-20μm
Eigenfrequency analysis of mechanical supports • 3 Feet downstream + Load
Eigenfrequency analysis of mechanical supports • 4 Feet downstream + LOAD Optimal Feet Distribution First mode 128 Hz
Eigenfrequency analysis of mechanical supports analysis Summary • Deformation not important can be machined out • Clearly 4 feet more stable and symmetric behavior • Component support also need optimizing • Feet location important • Lifting feet dose only bring advantage if beam lower down • Real measurements will prove how the complete setup will perform
Summary • Development of mechanical supports is well underway, during the spring we will have a confirmation of the mineral cast material for the functionality as a girder. As well as the functionality of the jacks, supports and the alignment wedges. • FEM eigenfrequency calculations should be done for the complete chain of mechanical supports + possible confirmation by measurement - magnets, RF structures, diagnostics, undulators, laser transfer, etc • For PSI-XFEL – check beam distance to supports, beam height, floor trench for girder, 3 – 4 feet, feet location handling and transport questions - time and tooling, tunnel size • Further comparison to other potential material like SiC should be carried out, possibly in scaled down size Thanks to All the great colleges that work together for this interesting and challenging development!