160 MeV H- injection into the CERN PSB
The H- beam from the proposed LINAC4 will be injected into the four existing rings of the PS Booster at 160 MeV. A substantial upgrade of the injection region is required, including the modification of the beam distribution system and the construction of a new H- injection system. This paper discusses beam dynamics and hardware requirements and presents the results of optimisation studies of the injection process for different beam characteristics and scenarios. The resulting conceptual design of the injection region is presented, together with the main hardware modifications and performance specifications.
Assessment of CERN PSB performance with LINAC4 by simulations of beams with strong direct space charge effects
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 low 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.
GdfidL: a finite difference program with reduced memory and CPU usage
Two new field solvers based on the FDTD algorithm are described. One solver computes resonant fields in loss-free structures, the other computes time dependent fields, scattering parameters and wake potentials in lossy or loss-free structures. The program uses linked lists instead of three dimensional arrays to model the computational volume. The main advantage of this approach is: Grid cells are only needed in regions, which are not filed with electric or magnetic conducting materials. This may result in an appreciable reduction of memory and CPU usage. The modeling via the linked lists is described in detail and some examples of calculated realistic geometries are given.