RF transfer in the coupledcavity freeelectron laser twobeam accelerator
Abstract
A significant technical problem associated with the CoupledCavity Free Electron Laser Two Beam Accelerator is the transfer of RF energy from the drive accelerator to the high gradient accelerator. Several concepts have been advanced to solve this problem. One possible solution is examined in which the drive and high gradient cavities are directly coupled to one another by means of holes in the cavity walls or coupled indirectly through a third intermediate transfer cavity. Energy cascades through the cavities on a beat frequency time scale which must be made small compared to the cavity skin time but large compared to the FEL pulse length. The transfer is complicated by the fact that each of the cavities in the system can support many resonant modes near the chosen frequency of operation. A generalized set of coupledcavity equations was developed to model the energy transfer between the various modes in each of the cavities. For a two cavity case transfer efficiencies in excess of 95 pct. can be achieved.
 Publication:

IEEE Particle Accelerator Conference
 Pub Date:
 May 1991
 Bibcode:
 1991IPAC.....T...6M
 Keywords:

 Cavity Resonators;
 Energy Transfer;
 Free Electron Lasers;
 Particle Acceleration;
 Radio Frequencies;
 Mathematical Models;
 Pulse Duration;
 Waveguides;
 Lasers and Masers