Y. Cuvet, F. Gerigk, J-M. Giguet, R. Wegner, P. Ugena-Tirado

Helicoflex (J-M. Giguet)

• double traces are usually a sign of over compression,
• it is possible to change the inner spring to change the compression force, but before doing that they want to analyze our joints,
• unlikely that the Cu plating is responsible for any leaks, what sometimes happens is that the joint takes some Cu with it when it is removed,
• now we have a direct contact with the development department,
• joints on Cu surfaces will modify the Ra on the Cu, meaning that after changing a joint it may be necessary to re-work the Cu surface before inserting a joint again,
• -> Russian Helicoflex order should be delivered to Russia, other delivery options would become extremely complicated,

Linac2 coupler (J-M. Giguet)

• the production of spare windows at the workshop is launched
• 2 aluminum joints are needed, when changing the window on the Linac2 coupler: one is available with Jan Hansen, a 2nd needs to be remade: J-M. Giguet and J. Hansen take contact with HTMS, jacks/spacers (F. Gerigk)
• 16 PIMS jack spacers are already made, Sylvain would not oppose to use them in a different way than the others, Benoit is investigating,
• -> RW will propose to Poland to modify the already made spacer,
• first contract went out for 1 and 5 ton jacks,
• made new design for the piece, which was entirely made of 316 LN: https://twiki.cern.ch/twiki/pub/SPL/Minutes14Jun2012/O-jack.png

mobile tuners (Y. Cuvet)

• screws are silver plated and being sent back,
• RF joints are ordered,
• Francescos question on commercial piece: answered that he needs 5 mm and not 9 as proposed,

DTL (Y. Cuvet, J-M. Giguet)

• Cu plating of segment one was successful, but there is a problem with the coverage of the iris, 2-3 cm missing, local repair will be made and then judged if this is acceptable,

SM18 – Linac4 test stand (J-M. Giguet, R. Wegner)

• 1st PIMS cavity has been re-tested. The power in the cavity could be increased up to ~750 kW. A further increase of the drive power lead to oscillations of the klystron, seen by a considerable amount of reflected power, a ~ 30% amplitude decrease in the cavity and a non-flat pulse shape.
• Control system shall be improved to run test stand reliably and to control it from distance

PIMS (R. Wegner)

• Tooling for vacuum tests have been designed and controlled. Production has been launched; the elements are foreseen to be finished end of August.
• The X-ray analysis of the 5th EB welding test from Julich is finished, result: weld is conform to required norm.
• 1st end disc M_1 made by the subcontractor CPL has been measured at NCBJ. Most measurements are conform to the relaxed specifications. Once the measurements are completed (surface roughness and metrology are missing), the disc will be shipped to CERN for validation.

-- RolfWegner - 14-Jun-2012