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Hessler, C.     [Heßler, C.]

Paper Title Page
TH6PFP041 Beam Line Design for the CERN HiRadMat Test Facility 3796
 
  • C. Heßler, R.W. Assmann, B. Goddard, M. Meddahi, W.J.M. Weterings
    CERN, Geneva
  
 

The LHC phase II collimation project requires beam shock and impact tests of materials used for beam intercepting devices. Similar tests are also of great interest for other accelerator components such as beam entrance/exit windows and protection devices. For this purpose a dedicated High Radiation Material test facility (HiRadMat) is under study. This facility may be installed at CERN at the location of a former beam line. This paper describes the associated beam line which is foreseen to deliver a 450 GeV proton beam from SPS with an intensity of up to 3·1013 protons per shot. Different beam line designs will be compared and the choice of the beam steering and diagnostic elements will be discussed, as well as operational issues.

  
TH6PFP042 The 4 GeV H- Beam Transfer Line from the SPL to the PS2 3799
 
  • C. Heßler, M. Eshraqi, B. Goddard, A.M. Lombardi, M. Meddahi
    CERN, Geneva
  
 

The proposed new CERN injector chain LINAC4, SPL, PS2 will require the construction of new beam transfer lines. A preliminary design has been performed for the 4 GeV SPL to PS2 H- transfer line. The constraints, beam parameters and geometry requirements are summarised and a possible layout proposed, together with the magnet specifications. First considerations on longitudinal beam dynamics and on beam loss limitations from H- lifetime are presented.

  
FR5PFP090 Handling Overlapping Fields within the V-Code Beam Dynamics Simulation Tool 4513
 
  • S. Franke, W. Ackermann, T. Weiland
    TEMF, TU Darmstadt, Darmstadt
  • J. Enders, C. Heßler, Y. Poltoratska
    TU Darmstadt, Darmstadt
  
 

Funding: This work was supported by DFG through SFB 634.


Based on the moment approach a fast tracking code named V-Code has been implemented at TEMF. Instead of using the particle distribution itself this method applies a discrete set of moments of the particle distribution. The time evolution of each moment can be deduced from the Vlasov equation when all essential external forces are known. These forces are given by the Lorentz equation in combination with the distribution of electric and magnetic fields. For efficiency reasons the 3D fields in the vicinity of the bunch trajectory are reconstructed in V-Code from one-dimensional field components by means of proper multipole expansions for the individual beam line elements. The entire beam line is represented in the code as a successive alignment of separate independent beam line elements. The proximity of some beam forming elements may lead to overlapping fringe fields between consecutive elements. In order to simulate even such beam lines with the V-Code, its database of disjunctive beam line elements has to be enhanced to deal also with superposed fields. In this paper a summary of issues regarding the implementation complemented with simulation results will be provided.