• A. Ratti, J.-F. Beche, J.M. Byrd, L.R. Doolittle, P.F. Manfredi, H.S. Matis, M.T. Monroy, J. Stiller, W.C. Turner, H. Yaver, T. stezelberger
  LBNL, Berkeley, California
• E. Bravin
  CERN, Geneva
• K.A. Drees
  BNL, Upton, Long Island, New York

The Luminosity Monitor for the LHC has been built at LBL and is going to be installed in the LHC in early 2009. The device designed for the high luminosity regions (ATLAS and CMS) is a gas ionization chamber, that is designed with the ability to resolve bunch by bunch luminosity as well as survive extreme levels of radiation. During the experimental R&D phase of its design, the prototype of this detector has been tested extensively in RHIC as well as in the SPS. Result of these experiments are shown here, with comments on the implications for early operations of the LHC.