Abstract
One of challenges that high-power FEL oscillators driven by energy recovery linac (ERL) are facing is to increase the extraction FEL efficiency as high as possible. The high-efficiency oscillation relaxes the total beam current needed for high-power lasing and makes the optical micropulse length shorter, which is useful for various applications. Two triple bend achromatic arcs have been used in a recovery loop for an ERL FEL at Japan Atomic Energy Agency (JAEA). The return arc after an undulator has an energy acceptance of 15%, which is large enough to recover the electron beam used for high-efficiency FEL oscillation. Recently we have achieved the efficiency exceeding 2%, which accompanies large energy spread, by doubling the electron bunch repetition rate. The FEL efficiency has been measured from the horizontal profiles of the exhausted electron beam with a wire scanner installed at a dispersive point in the return arc. The other arc placed upstream of the undulator has been found to work as a bunch compressor for the high-efficiency FEL oscillation.
| Original language | English |
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| Pages | 265-272 |
| Number of pages | 8 |
| Publication status | Published - 2006 Dec 1 |
| Event | 28th International Free Electron Laser Conference, FEL 2006 - Berlin, Germany Duration: 2006 Aug 27 → 2006 Sept 1 |
Other
| Other | 28th International Free Electron Laser Conference, FEL 2006 |
|---|---|
| Country/Territory | Germany |
| City | Berlin |
| Period | 06/8/27 → 06/9/1 |
ASJC Scopus subject areas
- Nuclear and High Energy Physics