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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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| THPPH041 |
Longitudinal Phase-Space Measurements of a High-Brightness Single-Bunch Beam
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676 |
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- R. Kato, T. Igo, G. Isoyama, S. Kashiwagi, Y. Kon
ISIR, Osaka
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The performance of a SASE-FEL strongly depends on the beam parameters, such as a longitudinal beam profile, a bunch charge, transverse emittances and an energy profile. The correlation between the longitudinal electron positions in a bunch and their energies has a critical effect on the temporal evolution of the optical pulse of SASE, and various methods to evaluate the longitudinal phase-space profile are under intense study. A new technique to measure the longitudinal phase-space distribution of the bunched electrons in one-shot using the combination of an energy profile monitor and a streak camera are currently under development at ISIR, Osaka University. In this contribution, preliminary experimental results of the measurements are presented.
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