Minutes02Feb2012 < SPL

F. Gerigk, J-M. Giguet, G. T. Papadaki, K. Schirm, R. Wegner, P. Ugena-Tirado

updated Linac4 master plan (F. Gerigk)

movable tuners (F. Gerigk)

CCDTL (F. Gerigk)

received translations of technical procedures, heat treatment duration was missing + small details, gave green light for support construction apart from heating cycle
asked to receive welding filler for TIG welding (Said)

collaboration with Spain (F. Gerigk)

Suitbert is visiting Bilbao to discuss details on possible manufacture of couplers, jacks, post couples, girders, tanks, etc.

cable positions (F. Gerigk)

meeting in preparation with Jean-Claude Guillaume on where RF antenna cables, and Flexwell will be connected

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

Cables for beam instrumentation tests have been measured.
The directional coupler has been re-adjusted, this time for maximum directivity for both ports. At a coupling of ~ -52 dB, the best directivity was found.
P. Baudrenghien measured all pickups and modes of the accelerating band to prepare the low level control of the Linac4 cavities.
The transmission from the waveguide though the 1st PIMS cavity to the BPM was investigated. Only noise at a level of -110 dB was seen. The BPM seems to be well decoupled from the accelerating mode. Moreover, up to 1.6 GHz, no transmission better -110 dB was measured.

PIMS (R. Wegner)

Metrology results of the 2 rings for the short module (G_1-2, G_13-14). Both are out of tolerances, in several measurements even more than 5 times.
Discs are machined with the newly developed tools.
Once the results are available, a meeting with the CERN workshop will be organised to take a decision how to repair/use the machined parts and how to continue with the qualification.
Tolerances are being investigated to find our span for acceptance.

PIMS (P. Ugena-Tirado)