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| PLT03 |
Energy Recovery Linac Experimental Challenges
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linac, photon, emittance, undulator |
7 |
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- D. H. Bilderback
Cornell University, Department of Physics, Ithaca, New York
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ERL projects are ongoing at Jlab, Daresbury, KEK and Cornell. Here we describe the typical experimental concerns of using high-coherence and ultra-fast pulses from the Cornell ERL as an example of a new opportunities. The hi-flux mode is one where the ERL runs at 5 GeV and 100 mA. Many experiments are photon-starved, such as inelastic X-ray scattering. The high-coherence mode is obtained at 25 mA and the transverse emittances could be as low as 8 pm. The beam size will be at its smallest under this operating condition and average spectral brightness as high as 1023 (standard units) are calculated. (WG2 will discuss the ERL accelerator issues.) We expect to produce a 3 micron round emitting source for imaging and coherence experiments on individual biological cells. The ultra-fast mode is one obtained by reducing the repetition rate to 1 MHz and by increasing the bunch charge to 1 nC per pulse and compressing the natural 2 ps bunch length to less than 100 fs. We will present science opportunities for X-ray experiments on a single atom as well as the challenges in optics, other experiments, and beam control issues when making a 1 nm focused X-ray beam size.
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Slides
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| WG333 |
High Harmonic Seeding and the 4GLS XUV-FEL
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laser, photon, electron, controls |
36 |
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- B. Sheehy
Sheehy Scientific Consulting, Wading River, New York
- J. A. Clarke, D. J. Dunning, N. Thompson
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
- B. W.J. McNeil
USTRAT/SUPA, Glasgow
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The Fourth Generation Light Source (4GLS) project, proposed by the CCLRC in the U. K., will include free electron lasers in the XUV, VUV, and IR. It is proposed that the XUV-FEL, operating between 8–100 eV, be seeded by a high harmonic (HH) source, driven by an ultrafast laser system. This offers advantages in longitudinal coherence, synchronization, and the potential for chirped pulse amplification and pulse shaping. In this talk we discuss the issues of HH generation relevant to its use as a seed (energy, spectrum, tunability, synchronization and time structure) and the current planned implementation in the 4GLS XUV-FEL.
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| WG403 |
Laser System of Photocathode RF Gun in Pohang Accelerator Laboratory
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laser, electron, cathode, gun |
42 |
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- C. Kim, J. Choi, J. Y. Huang, I. S. Ko, Y. W. Parc, J. H. Park, S. J. Park
PAL, Pohang, Kyungbuk
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Funding: Work supported by the Ministry of Science and Technology (MOST), Korea.
A photocathode RF gun have been installed in a photo-injector test facility for the PAL XFEL in the Pohang Accelerator Laboratory. The photocathode RF gun will provide electron bunches which have high charge (1 nC), short bunch length (10 ps). For this purpose, a new laser system was installed and it can provide laser pulses of 2 mJ energy, 110 fs pulse width at 800 nm wavelength. A triple harmonic generator and Ultraviolet (UV) stretcher system were added to generate UV laser pulses with controllable pulse widths which can be increased up to 10 ps. In this article, we introduce our laser system and report recent progress of electron beam generations under the various laser conditions.
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