| Paper |
Title |
Page |
| MOPPH009 |
Comparison of HGHG and Self Seeded Scheme for the Production of Narrow Bandwidth FEL Radiation
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25 |
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- A. Marinelli
Rome University La Sapienza, Roma
- L. Giannessi
ENEA C. R. Frascati, Frascati (Roma)
- C. Pellegrini, S. Reiche
UCLA, Los Angeles, California
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One goal of several FEL facilities operating in the soft x-ray spectral range, is the production of narrow bandwidth FEL radiation. Several schemes have been proposed to obtain narrower bandwidths than that achievable with SASE-FELs. In this paper we investigate numerically, and compare, the properties of two schemes: Self-Seeding and High Gain Harmonic Generation. These schemes have been thoroughly studied analitically and numerically in the past. The aim of this work is to compare the performances of these schemes with respect to several non-ideal properties of the electron beam and seed laser, such as shot to shot energy fluctuations, nonlinear energy chirp and phase noise in the seed source. The work has been carried out with the aid of the time dependent FEL codes GENESIS (3D) and PERSEO (1D).
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| TUBAU04 |
Generation of Sub-fsec, High Brightness Electron Beams for Single Spike SASE FEL Operation
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214 |
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- J. B. Rosenzweig, M. P. Dunning, L. Faillace, A. Fukasawa, E. Hemsing, G. Marcus, A. Marinelli, P. Musumeci, B. D. O'Shea, C. Pellegrini, S. Reiche
UCLA, Los Angeles, California
- M. Boscolo, M. Ferrario, L. Palumbo, B. Spataro, C. Vaccarezza
INFN/LNF, Frascati (Roma)
- L. Giannessi, C. Ronsivalle
ENEA C. R. Frascati, Frascati (Roma)
- V. Petrillo
Istituto Nazionale di Fisica Nucleare, Milano
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We present here the theory and computational modeling of beams in a new regime, where <1 pC beams are strongly velocity bunched at low energy, and then compressed at several GeV to less than a fsec. This regime of operation produces beams with thermally dominated transverse emittance, and mitigates many problems associated with the nC-level operation. These problems include CSR induced instability and intra-undulator wakes. The resulting beams have extremely high brightness, enabling very high gain, efficiency, and single spike operation. We present the scaling laws governing this regime, and the detailed example of the proposed SPARX FEL design.
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