Research Progress and Forecast Report for MSNW FEL Oscillator Program.
Abstract
The purpose of this program is to provide assessment data for determining the potential of tapered-wiggler free-electron laser (FEL) oscillators. It is expected that the tapered-wiggler concept will lead to the development of high-efficiency FELs by providing substantial energy extraction in a single pass of the e-beam through the wiggler magnet. The work consists of parallel theory and experimental tasks. The latter involve parameterization of the FEL interaction on a single pass basis, and this portion of the work has not yet been completed. The theory work described here deals with the transverse mode structure of FEL oscillators. This mode analysis has shown that (1) the one-way nature of the FEL gain media results in an asymmetric mode which is not an eigenmode of the cavity, i.e., it is described as a linear combination of cavity modes, (2) the higher-order mode content is largest in confocal or concentric cavities, rather than the intermediate cases, (3) the higher-order mode content can be controlled by aperturing, and (4) the quality of the output beam is nearly diffraction limited. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1983
- Accession Number
- ADA127786
Entities
People
- D. C. Quimby
- J. Slater
- W. Grossman