A CW high power linear accelerator can only work with very low particles losses and structure activation.
At low energy, the RFQ is a very sensitive accelerator element to losses. To design this structure, a good understanding
of the beam dynamics is requested. Generally, the reference code PARMTEQM is enough to design the
accelerator. TOUTATIS has been written with goals of cross-checking results and obtaining a more
reliable dynamics. This paper relates the different numerical methods used in the code. It is time-based,
using multigrids methods and adaptive mesh for a fine description of the forces without being time consuming.
The field is calculated through a Poisson solver and the vanes are fully described, allowing to
properly simulate the coupling gaps and RFQs extremities. Theoretical and experimental tests are also described and
show a good agreement between simulations and reference cases. |
