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| THPPH040 |
Study on Focusing Property of New Type Wiggler and SASE-FEL Experiment at the ISIR, Osaka University
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672 |
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- S. Kashiwagi, G. Isoyama, R. Kato
ISIR, Osaka
- H. Sasaki, K. Tsuchiya, S. Yamamoto
KEK, Ibaraki
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We have developed a new type of wiggler based on the edge-focusing wiggler for free electron laser (FEL) in the infrared region at the Institute of Scientific and Industrial Research (ISIR), Osaka University. The strong focusing (SF) scheme is adopted for the new wiggler in order to keep the beam size small along the wiggler. The period length of the wiggler is 60 mm, the number of periods is 32, and the total length is 1.938 m, including end magnet blocks for the orbit compensation. The wiggler consists of four FODO cells for double focusing. Focusing elements and defocusing elements are incorporate with single wiggler periods with edge angles of +5 and -5 degrees, respectively, and they are separated by three normal wiggler periods. The focusing properties of the SF wiggler for FEL and SASE are studied using a high-intensity electron beam at ISIR L-band linear accelerator. Optics parameters of electron beam are changed at the entrance of the SF wiggler, and the profiles of the electron beam are measured using screen monitors at several points along the wiggler. We will present the result of the beam experiments using the focusing wiggler in this conference.
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