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Carli, C.

Paper Title Page
MOPD014 Single-batch Filling of the CERN PS for LHC-type Beams 699
 
  • S. Hancock, C. Carli, J.F. Comblin, A. Findlay, K. Hanke, B. Mikulec
    CERN, Geneva
  
 

Since the CERN PS Booster cannot simultaneously provide the beam brightness and intensity required, the nominal (25ns bunch spacing) proton beam for the LHC involves double-batch filling of the PS machine. Linac 4, which is under construction, will eventually remove this restriction. In the meantime, the request for 50 and 75ns bunch spacings to mitigate electron cloud effects has lowered the intensity demand such that the Booster can meet this in a single batch without compromising beam brightness. Single-batch transfer means providing two bunches from each of three Booster rings and, in turn, that the bunch spacing is modified by the addition of an h=1 rf component to the h=2 in the Booster in order to fit the h=7 rf buckets waiting in the PS (whilst leaving one bucket empty for kicker purposes). Following the first experiments performed in 2008, the rf manipulations in the Booster have been refined and those in the PS have been modified to cope with single-batch beams. This latest work is presented for both the 50 and 75ns variants.

  
MOPD015 Status of the Linac4 Project at CERN 702
 
  • K. Hanke, C. Carli, R. Garoby, F. Gerigk, A.M. Lombardi, S. Maury, C. Rossi, M. Vretenar
    CERN, Geneva
  
 

The construction of Linac4, a 160 MeV H- Linac, is the first step in upgrading the LHC injector chain. Unlike CERN's present injector linac, Linac4 will inject into the subsequent synchrotron via charge exchange injection. In a first stage, it will inject into the existing CERN PS Booster. At a later stage, Linac4 has the option to be extended by a superconducting linac (SPL) which could then inject into a new synchrotron (PS2). Construction of Linac4 has started in 2008, and beam operation is presently planned for 2014. An overview of the Linac4 main parameters and design choices is given, and the status of the construction reported.

  
TUPD013 Assessment of CERN PSB Performance with Linac4 by Simulations of Beams with Strong Direct Space Charge Effects 1949
 
  • C. Carli, M. Chanel, B. Goddard, M. Martini, D. Quatraro, M. Scholz
    CERN, Geneva
  • M. Aiba
    PSI, Villigen
  
 

The performance of the CERN PS Booster (PSB) synchrotron is believed to be limited mainly by direct space charge effects at low energy. The main motivation to construct Linac4 is to raise the PSB injection energy to mitigate direct space charge effects. At present, simulation of the injection and the ow energy part of the cycle aim at defining Investigations on the influence of parameters of the injected beam on the performance of the PSB are described.

  
THPEB030 Stripping Foil Issues for H- Injection into the CERN PSB at 160 MeV 3951
 
  • B. Goddard, M. Aiba, C. Bracco, C. Carli, M. Meddahi, W.J.M. Weterings
    CERN, Geneva
  
 

Beam physics considerations for the stripping foil of the 160 MeV PSB H- injection system are described, including the arguments for the foil type, thickness, geometry and positioning. The foil performance considerations are described, including expected stripping efficiency, emittance growth, energy straggling, temperature and lifetime. The different beam loss mechanisms are quantified in the context of the aperture limits, operational considerations and collimation requirements.