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FEL oscillation with a high extraction efficiency at JAEA ERL FEL

Nishimori, Nobuyuki; Hajima, Ryoichi; Iijima, Hokuto; Kikuzawa, Nobuhiro ; Minehara, Eisuke; Nagai, Ryoji; Nishitani, Tomohiro; Sawamura, Masaru

One of challenges that high power FEL oscillators with 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 FEL optical pulse length shorter, which is useful for various applications. A triple bend achromat loop with energy acceptance of 7 % has been used in an ERL FEL at JAEA. Recently we have achieved the efficiency exceeding 2 %, which accompanies large energy spread beyond the energy acceptance of the loop, by doubling the electron bunch repetition rate. The optical pulse can now interact with a fresh electron bunch every round trip, while it overlapped with an injected electron every two round trips before the doubling of the bunch repetition. This talk will summarize our recent development of a high power FEL with a high extraction efficiency at JAEA ERL FEL.

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