A   B   C   D   E   F   G   H   I   K   L   M   O   P   Q   R   S   T   U   V   W  

collective-effects

Paper Title Other Keywords Page
MOM1MP02 The FPP and PTC Libraries lattice, closed-orbit, survey, simulation 17
 
  • E. Forest, Y. Nogiwa
    KEK, Ibaraki
  • F. Schmidt
    CERN, Geneva
  In this short article we summarize the FPP package and the tracking code PTC which is crucially based on FPP. PTC is remarkable for its use of beam structures which take into full account the three dimensional structure of a lattice and its potential topological complexities such as those found in colliders and recirculators.  
slides icon Slides  
 
TUPPP30 ROCOCO - A Zero Dispersion Algorithm for Calculating Wake Potentials simulation, gun, linac, collider 144
 
  • R. Hampel, W. F.O. Müller, T. Weiland
    TEMF, Darmstadt
  Funding: This work was partially funded by EUROTeV (RIDS-011899) and DESY Hamburg.

Wake fields are a limiting factor due to their collective effects. In colliders and high energy accelerators used in FEL projects short bunches excite high frequency fields which make the computation of near range wake fields inaccurate. Additionally the length of modern accelerating structures limit the powers of certain codes such as TBCI or MAFIA. Both limiting factors, i.e. short bunches and length of accelerating structures - a multiscale problem, can be dealt with in the following way. Using certain zero dispersion directions of a usual Cartesian grid leads to a decrease of the overall dispersion which usually arises by having discrete field values. Combined with a conformal modelling technique the full time step limited by the Courant criterion is used and a moving window is applied. Thus simulations of short bunches in long structures are possible - dispersion and memory problems have been avoided. In this work ROCOCO (Rotated mesh and conformal code) is presented. The zero dispersion algorithm uses a new discretization scheme based on a rotated mesh combined with the established USC scheme and the moving window technique mentioned above. The advantage of an explicit algorithm is joined with the zero dispersion along the beam's propagation direction. A dispersion analysis for the 2D version of the code is shown as well as some results for common structures of accelerator physics - such as collimators and the TESLA 9 cell structure.