Beam loading compensation of traveling wave linacs through the time dependence of the rf drive
Abstract
Beam loading in traveling-wave linear accelerating structures leads to unacceptable spread of particle energies across an extended train of bunched particles due to beam-induced field and dispersion. Methods for modulating the rf power driving linacs are effective at reducing energy spread, but for general linacs do not have a clear analytic foundation. We report here methods for calculating how to modulate the rf drive in arbitrarily nonuniform traveling-wave linacs within the convective-transport (power-diffusion) model that results in no additional energy spread due to beam loading (but not dispersion). Varying group velocity, loss factor, and cell quality factor within a structure, and nonzero particle velocity, are handled.
- Publication:
-
Physical Review Accelerators and Beams
- Pub Date:
- September 2011
- DOI:
- 10.1103/PhysRevSTAB.14.090402
- Bibcode:
- 2011PhRvS..14i0402T
- Keywords:
-
- 41.75.Ht;
- Relativistic electron and positron beams