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Bellodi, G.

Paper Title Page
MOP086 End to End Beam Dynamics and RF Error Studies for Linac4 275
 
  • G. Bellodi, M. Eshraqi, J.-B. Lallement, S. Lanzone, A.M. Lombardi, E.Zh. Sargsyan
    CERN, Geneva
  • R.D. Duperrier, D. Uriot
    CEA, Gif-sur-Yvette
  
 

Linac4 is a normal conducting H- linac to be built at CERN as a new injector to the PS Booster and later on as a front end of a Superconducting Proton Linac (SPL). The layout consists of a H- rf source, a magnetic LEBT, a RFQ (accelerating the beam from 45 keV to 3 MeV), a chopper line, a conventional Drift Tube Linac (from 3 MeV to 50 MeV), a Coupled Cavity Drift Tube Linac (from 50 MeV to 100 MeV) and a pi-mode structure (PIMS, from 100 to 160 MeV), all operating at a frequency of 352 MHz. End-to-end beam dynamics simulations have been carried out in parallel with the codes PATH and TRACEWIN to optimise the design and performance of the accelerator and at the same time to guarantee a cross-check of the results found. An extensive statistical campaign of longitudinal error studies (static and dynamic) was then launched for validation of the proposed design and to assess the maximum level of RF jitter/inaccuracies (in both phase and amplitude) the system can tolerate before beam quality at injection in the PS Booster - and later in the SPL- is compromised.

  
TUP083 Diagnostics and Measurement Strategy for the CERN Linac 4 591
 
  • K. Hanke, G. Bellodi, J.-B. Lallement, A.M. Lombardi, B. Mikulec, M. Pasini, U. Raich, E.Zh. Sargsyan
    CERN, Geneva
  • H. Hori
    MPQ, Garching, Munich
  
 

Linac 4 is a 160 MeV H- linac which will become the new injector for CERN's proton accelerator chain. The linac will consist of 4 different rf structures, namely RFQ, DTL, CCDTL and PIMS running at 352.2 MHz with 2 Hz repetition rate and 0.4 ms pulse length. A chopper line ensures clean injection into the PS Booster. The combination of high frequency and a high-current, low-emittance beam calls for a compact design where minimum space is left for diagnostics. On the other hand, diagnostics is needed for setting up and tuning of the machine during both commissioning and operation. A measurement strategy and the corresponding choice of the diagnostic devices and their specific use in Linac4 are discussed in this paper.