Efficiency Enhancement in a Tapered Free Electron Laser by Varying the Electron Beam Radius
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Energy extraction efficiency of a free electron laser (FEL) can be increased when the undulator is tapered after the FEL saturation. By use of ray equation approximation to combine the one-dimensional FEL theory and optical guiding approach, an explicit physical model is built to provide insight to the mechanism of the electron-radiation coherent interaction with variable undulator parameters as well as electron beam radius. The contribution of variation in electron beam radius and related transverse effects are studied based on the presented model and numerical simulation. Taking a recent studied terawatt, 120 m long tapered FEL as an example, we demonstrate that a reasonably varied, instead of a constant, electron beam radius along the undulator helps to improve the optical guiding and thus the radiation output.
- Research Organization:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76SF00515
- OSTI ID:
- 1035087
- Report Number(s):
- SLAC-PUB--14756
- Country of Publication:
- United States
- Language:
- English
Similar Records
Area-preserving scheme for efficiency enhancement in single-pass tapered free electron lasers
Free Electron Lasers with Slowly Varying Beam and Undulator Parameters
Journal Article
·
Sun Oct 14 20:00:00 EDT 2018
· Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
·
OSTI ID:1490886
Free Electron Lasers with Slowly Varying Beam and Undulator Parameters
Conference
·
Wed May 25 00:00:00 EDT 2005
·
OSTI ID:890810