Abstract
In this paper, we present a new kind of high power and high efficiency free-electron laser oscillator based on the application of the tapering enhanced stimulated superradiant amplification (TESSA) scheme. The main characteristic of the TESSA scheme is a high intensity seed pulse which provides high gradient beam deceleration and efficient energy extraction. In the oscillator configuration, the TESSA undulator is driven by a high repetition rate electron beam and embedded in an optical cavity. A beam-splitter is used for outcoupling a fraction of the amplified power and recirculate the remainder as the intense seed for the next electron beam pulse. The mirrors in the oscillator cavity refocus the seed at the undulator entrance and monochromatize the radiation. In this paper we discuss the optimization of the system for a technologically relevant example at 1 $\mu$m using a 1~MHz repetition rate electron linac starting with an externally injected igniter pulse.
Highlights
High wall-plug efficiency generation of intense, coherent, tunable electromagnetic radiation has many applications in all fields of science and technology
Applications of high intensity and average power laser sources range from driving high gradient laser accelerators [2], to inertial fusion or space-related applications [3]
The concept of a pre-bunched electron beam Free-electron laser (FEL) oscillator, operating on the principle of stimulatedsuperradiance [10], was first proposed in [11,12]. In these papers it was shown that the stable saturation point of a prebunched FEL oscillator provides high radiative energy extraction efficiency and potential high power operation, by taking advantage of most efficient phase-space dynamics of tight electron bunches, performing a synchrotron oscillation process in the ponderomotive potential well
Summary
We present a new kind of high power and high efficiency free-electron laser oscillator based on the application of the tapering enhanced stimulated superradiant amplification (TESSA) scheme. The main characteristic of the TESSA scheme is a high intensity seed pulse which provides high gradient beam deceleration and efficient energy extraction. The TESSA undulator is driven by a high repetition rate electron beam and embedded in an optical cavity. A beam-splitter is used for outcoupling a fraction of the amplified power and recirculate the remainder as the intense seed for the electron beam pulse. We discuss the optimization of the system for a technologically relevant example at 1 μm using a 1 MHz repetition rate electron linac starting with an externally injected igniter pulse
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