Kitamura, H.
Paper | Title | Page |
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MOOC004 | Seeding the FEL of the SCSS Phase 1 Facility with the 13th Laser Harmonic of a Ti: Sa Laser (61.5 nm) Produced in Xe Gas | 224 |
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In order to reach very short wavelengths in FEL, and to have a more compact, fully coherent and tunable source, a particular seeding configuration is foreseen to be tested as a demonstration experiment in 2006 into the SCSS phase 1 facility (Spring-8 Compact Sase Source, Japan). The external source is the 13th harmonic (61.5 nm) of a Ti: Sa laser (25 mJ, 10 Hz, 100 fs) generated in 10 Hz pulsed Xe gas cell. The harmonic generation process provides us with a intense (1 μJ) and ultra-short (50 fs) VUV beam. The design of the experiment implantation is discussed, taken into account the performances of the generation process, the focusing of the selected harmonic into the modulator, and the resistance of the optical components. Besides one should consider the vacuum needs, the geometrical problems and the mechanics for the under UHV mirrors translation. One first chamber is dedicated to the harmonic generation. A second one is used for spectral selection and adaptation of the harmonic in the modulator. Finally theoretical estimates of the performances relying on 1D simulations using PERSEO code and 3D simulations using GENESIS code are also given. |
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MOPP018 | Status of R&D for SCSS Project | 75 |
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Funding: Representing the SCSS project team SCSS, an acronym of "SPring-8 Compact SASE Source", is an X-ray FEL project under planning to be build at the SPring-8 site. R&Ds for accelerator components such as the pulsed-DC electron gun, C-band main linac, and in-vacuum short period undulator have been performed and almost completed. Before construction of the X-ray FEL facility, a prototype accelerator with the electron energy of 250 MeV is being built to demonstrate the concept of SCSS. In this presentation, status of the R&Ds for each accelerator component will be presented together with an overview of the 250-Mev prototype accelerator. |
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TUOC001 | In-Vacuum Undulators | 370 |
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In-vacuum undulators are now widely used in lots of SR facilities to provide highly-brilliant hard x-rays not only in large-scale facilities such as SPring-8, ESRF and APS, but also in medium-scale facilities with an electron energy up to 3 GeV. In addition, the SCSS (SPring-8 Compact SASE Source) project is going to adopt the in-vacuum undulator not only for reducing the electron energy to achieve angstrom X-ray FEL but also for commissioning and alignment of components in the undulator line that takes advantage of variable vacuum gap (physical aperture for the electron beam). In this talk, overview of technologies required for development of the in-vacuum undulator will be presented together with practical examples. In addition, ongoing R&Ds at SPring-8 (cryogenic undulator, in-situ field measurement system) will be described in brief. |
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