TDI observations winter break 2012

Thanks to F. Loprete, E. Page, B. Henrist, B. Salvant

TDI.4R8.B2• Jaws not centered with respect to the beam screen exit, both ends hanging down• Large deformation on right (38 mm) and left (24 mm) side of the beam screen at 2.6 m from

the transition flange• First wrinkle close to support point

Offset ~ 20 mm

TDI.4R8.B2• Deformation on each beam screen part• Extrem bump on the upstream side

Two waves, upstream worse

RF contacts well in place in the center

TDI.4R8.B2• Ti coating looks ok

TDI.4L2.B1• Same shape with two humps and the ends hanging• Max deformation around 18 mm• Small lateral offset at the central connection

TDI.4R8.B2• Whole beam screen decends• Deformation in every plane• Major cause for big deformations:

„Sliding fixation“

TDI.4R8.B2• RF contacts and foil look good

TDI.4R8.B2• Copper very soft

TDI.4R8.B2• Little space to add support structure• Very reduced accessibility• Main flange not to be disassembled in situ