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| MOPPH012 | The Conceptual Design of the 4GLS XUV-FEL | undulator, electron, photon, simulation | 63 | ||
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The Conceptual Design Report for the 4th Generation Light Source (4GLS) at Daresbury Laboratory in the UK was published in Spring 2006. A key component of the proposal is an XUV-FEL amplifier directly seeded by a High Harmonic source and operating in the photon energy range 8-100eV. Numerical modelling shows the FEL may generate ~50fs (FWHM) pulses of variably-polarised, temporally-coherent radiation with peak powers in the range 2-8 GW.
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| TUPPH013 | Electrodynamical Properties of a Volume Free Electron Laser with a ''Grid'' Resonator | electron, wiggler, laser, free-electron-laser | 335 | ||
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The electrodynamical properties of a crystal-like artificial periodic structure (a photonic crystal), formed by a periodic structure built from the metallic threads ("grid" volume resonator) is considered. Peculiarities of passing of electromagnetic waves with different polarizations through such a volume resonator are discussed. It is shown that the frequency spectrum of diffraction (Smith-Purcell) radiation is such a resonator appears splitted due to the complex anomalous Doppler effect. Specific features of a Volume Free Electron Laser (VFEL)*,** with a ''grid'' resonator for different frequency ranges are analyzed. Possibility of development of tunable radiation source in THz range is particularly discussed. The equations, which describe lasing of VFEL with a ''grid'' resonator (photonic crystal)***, are obtained. Estimation of the resonator durability to the heating by the electron beam is done.
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* V. G.Baryshevsky, K. G. Batrakov, A. A. Gurinovich et al., NIM 483A (2002) 21. ** V. G. Baryshevsky, NIM A 445 (2000) 281. *** V. G. Baryshevsky et.al. LANL e-print archive: physics/0409125 |
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| TUPPH024 | Super Coherent THz Light Source Based on an Isochronous Ring with Very Short Electron Bunches | gun, radiation, simulation, electron | 371 | ||
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A project to develop a coherent Teraherz (THz) light has been progressed at Laboratory of Nuclear Science, Tohoku University. The coherent synchrotron light at the frequency region of THz is emitted from electron bunches of several tens femto-second bunch length created by a thermionic RF gun and a sophisticated bunch compressor. In addition, the beam is circulating a ring consisted of nearly complete isochronous optics for many turns*, so that the average power of the radiation may be considerably enhanced. Forgetting about the amount of the charge, thermionic RF gun is quite suitable to produce such a very short bunch. We have developed an ITC (Independently-Tunabel-Cells) RF gun**, which is consisted with two independent cavities in order to manipulate the longitudinal phase space. In addition to expected performance of the ITC RF gun and the bunch compressor, the paper describes the latest version of the lattice design of the isochronous ring and results of tracking simulations as well. Possibility of long wavelength SASE mode and superradiant on the isochronous ring are also discussed.
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* H. Hama, Proc. the 27th Int. Free Electron Laser Conf., Stanford, CA (2005) 1-7. ** T. Tanaka, F. Hinode, M Kawai, A. Miyamoto, K. Shinto, H. Hama, Proc. PAC2005, Knoxville, TN (2005) 3499-3501. |
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| TUPPH033 | A FEL Amplifier Based on Planar Bragg Waveguides | coupling, electron, undulator, resonance | 393 | ||
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A planar periodic Bragg structure can be used for wave guiding in the direction transverse to the lattice vector. Open Bragg waveguide can provide high selectivity over the transverse coordinate when its size essentially exceeds wavelength. We study several new schemes of FEL amplifiers based on these structures. In a transverse current amplifier scheme it is beneficial to use a grating with a step of corrugation, that results in the existence of a single low dissipative mode located near defect. The sheet electron beam moves across the waveguide to be resonant to one of partial waves forming the operating mode. Another way is a traditional traveling wave amplifier scheme where electron beam moves along waveguide axis. To increase effective size of operating mode is suggested a structure with regular longitudinal corrugation that couples two partial waves propagating at some angle to the axis to the wave propagating directly along the axis. This wave, which in moving reference frame is transformed into a cut off mode*, is excited by the electrons. Analysis shows rather high gain and efficiency of the novel application schemes with simultaneous discrimination of parasitic modes.
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*1. N.S. Ginzburg, A. M.Malkin, N. Yu. Peskov et. al. Improving selectivity of free electron maser with 1D Bragg resonator using coupling of propagating and trapped waves, PR ST-AB 8,040705(2005) |
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