• R. Calaga, R. De Maria
  BNL, Upton, Long Island, New York
• R.W. Assmann, J. Barranco, F. Caspers, E. Ciapala, T.P.R. Linnecar, E. Métral, Y. Sun, R. Tomás, J. Tuckmantel, Th. Weiler, F. Zimmermann
  CERN, Geneva
• G. Burt
  Lancaster University, Lancaster
• Y. Funakoshi, A. Morita, Y. Morita, K. Nakanishi, Y. Ohnishi
  KEK, Ibaraki
• Z. Li, A. Seryi, L. Xiao
  SLAC, Menlo Park, California
• P.A. McIntosh
  STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
• J. Qiang
  LBNL, Berkeley, California
• N. Solyak, V.P. Yakovlev
  Fermilab, Batavia

Funding: This work was partially performed under the auspices of the US DOE and the European Community-Research Infrastructure, FP6 programme (CARE, contract number RII3-CT-2003-506395)}

The LHC crab cavity program is advancing rapidly towards a first prototype which is anticipated to be tested during the early stages of the LHC phase I upgrade and commissioning. Some aspects related to crab optics, collimation, aperture constraints, impedances, noise effects, beam transparency and machine protection critical for a safe and robust operation of LHC beams with crab cavities are addressed here.

Slides

• N. Solyak, T.J. Peterson, V. Poloubotko, V.P. Yakovlev
  Fermilab, Batavia
• O. Brunner, E. Ciapala, T.P.R. Linnecar, J. Tuckmantel, W. Weingarten
  CERN, Geneva
• R. Calaga
  BNL, Upton, Long Island, New York

Funding: This work has been partially performed under the auspices of the US department of energy

The complex LHC crab cavity design and the beam-line configuration pose very tight constraints for the cryostat design. An initial assessment of the LHC main RF cryostat points to a new design both from the RF and engineering point of view. The cavity and tunnel constraints are discussed in detail and an intial cryostat design along with the cryogenic circuit is presented.

• A.C. Butterworth, M. E. Angoletta, L. Arnaudon, P. Baudrenghien, J. Bento, T. Bohl, O. Brunner, E. Ciapala, F. Dubouchet, G. Hagmann, W. Höfle, T.P.R. Linnecar, P. Maesen, J.C. Molendijk, E. Montesinos, J. Noirjean, A.V. Pashnin, V. Rossi, J. Sanchez-Quesada, M. Schokker, E.N. Shaposhnikova, D. Stellfeld, J. Tuckmantel, D. Valuch, U. Wehrle, F. Weierud
  CERN, Geneva
• R. Sorokoletov
  JINR, Dubna, Moscow Region

Hardware commissioning of the LHC RF system was successfully completed in time for first beams in LHC in September 2008. All cavities ware conditioned to nominal field, power systems tested and all Low level synchronization systems, cavity controllers and beam control electronics were tested and calibrated. Beam was successfully captured in ring 2, cavities phased, and a number of initial measurements made. These results are presented and tests and preparation for colliding beams in 2009 are outlined.