RF System: Is It Working Well Enough?

We first briefly review the RF setting-up and operation in 2010. The issue of RF noise is developed in details, identifying the major noise sources and explaining why it did not lead to significant beam diffusion effects. A figure is given for its contribution to the bunch lengthening in physics, that is well below the effect of Intra-Beam Scattering. Capture losses were low in 2010 (below the 1% level) but still made filling troublesome due to the very large sensitivity of the Beam Loss monitors. The choice of voltage at injection is revisited and it is proposed to mismatch the capture in 2011 to reduce loss. We then present the longitudinal damper that will also reduce capture loss in multi-batch injection. The issue of surviving a klystron trip during physics is studied. Finally, the longitudinal 2011 parameters are presented.