Abstract
The performance of an optical resonator featuring an insertable scraper output coupler was evaluated for the JAERI far-infrared free-electron laser. An efficiency factor of the resonator was introduced for evaluation. The efficiency factor was derived from the amount of the output coupling and diffractive loss of the optical resonator, which were calculated by using an optical mode calculation code, using the iterative computation called Fox-Li procedure. As a result of the evaluation, it was found that the insertable scraper coupler was the most suitable for the far-infrared free-electron lasers. Dependencies of insertion direction and scraper radius were also investigated to find out the optimum geometry of the insertable scraper coupler. It was found that the optimum direction of the scraper was parallel to the wiggling plane of the electron beam and the efficiency of the optical resonator increased with the enlargement of the scraper radius.
| Original language | English |
|---|---|
| Pages (from-to) | 519-523 |
| Number of pages | 5 |
| Journal | Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment |
| Volume | 475 |
| Issue number | 1-3 |
| DOIs | |
| Publication status | Published - 2001 Nov 21 |
| Externally published | Yes |
| Event | 22nd International Free Electron Laser Conference (FEL 2000) - Durham, NC, United States Duration: 2000 Aug 13 → 2000 Aug 18 |
Keywords
- Efficiency
- Far-infrared
- Free-electron laser
- Optical resonater
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Instrumentation