Tunable two frequency free electron laser using a Pelletron as a driver for a plasma beatwave accelerator
In this article, the possibility of amplifying two frequencies simultaneously in a free electron laser is discussed. Stability conditions for electron motion are derived, and numerical calculations reported. The advantages offered by using a dc Pelletron beam to power such a device, with application to the plasma beatwave accelerator — high efficiency, high average power, radiation wavelength tunability, and the possibility of phase locking several independent optical cavities — are evaluated. Related research efforts, and their impact on the design of this device are discussed.