Minutes RF structure meeting 23.04.2009

F. Gerigk, S. Ramberger, G. DeMichele, F. Grespan

PIMS (FrankGerigk)

• Welding Test (Soltan Institute): the welding test has been a full success. For the series production a welding more deep than 7 mm has been proposed, in order to avoid that bubbles at the bottom of the welding can connect to the tank vacuum and create virtual leaks.
• Workshop meeting 23/04:
  • complete machining of the central cell, ready to be brazed
  • small changes in the drawings
• SCHEDULE:
  • December 2009: machining done
  • March 2010: Low Power Test
  • May/June 2010: final assembly

HOM

• 25-26 June 2009: workshop on HOMs for SPL.

DTL

• Prototype vacuum: because of the chemical processing, the mild steel tank is now degassing from the layer under the copper plating.(SuitbertRamberger)
• Power Coupler:(GiovanniDeMichele)
  • comparison of Beta (coupling parameter) computed with 2 simulation methods -> 10% safety margin for simulation results
  • MWS and HFSS give different frequency detuning due to the wave-guide -> check with measurements on the Prototype
• Cold Model realigned by RF workshop, and reassembled. First bead-pulling gives a field more flat, but still +/- 20% error for some gaps. Next step is changing the bead to reduce the noise. (FrancescoGrespan)
• Paper on the DTL prototype is ready for PAC09. FR5REP054.pdf

-- FrancescoGrespan - 27 Apr 2009