| Paper |
Title |
Page |
| WPAP012 |
Preliminary Results on Beam Dynamics of Laser Pulse Shaping Effects in SPARC
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1315 |
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- M. Boscolo, M. Ferrario, M. Migliorati
INFN/LNF, Frascati (Roma)
- F. Castelli, S. Cialdi, A.F. Flacco
INFN-Milano, Milano
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In a photoinjector system the role played by the laser pulse shaping in achieving high quality electron beam is crucial, as it determines the distribution dependent space charge effects in the early stages of the acceleration. A dedicated code to simulate pulse shaping in a laser system and able to generate the corresponding initial electron beam distribution has been developed. Realistic deviations from the ideal flat top pulse give for example a ramp or multi-peaks shape with a raletive rise time, plateau deformation and ripples. The beam dynamics of electron beams with different initial temporal pulse characteristics along the SPARC photoinjector has also been studied with the code PARMELA. More exotic pulse shaping are also discussed. The study presented here gives some indications on the tolerances of the laser beam characteristics for the electron beam quality preservation.
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| RPPT031 |
Recent Results from and Future Plans for the VISA II SASE FEL
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2167 |
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- G. Andonian, R.B. Agustsson, P. Frigola, A.Y. Murokh, C. Pellegrini, S. Reiche, J.B. Rosenzweig, G. Travish
UCLA, Los Angeles, California
- M. Babzien, I. Ben-Zvi, V. Litvinenko, V. Yakimenko
BNL, Upton, Long Island, New York
- I. Boscolo, S. Cialdi, A.F. Flacco
INFN-Milano, Milano
- M. Ferrario, L. Palumbo, C. Vicario
INFN/LNF, Frascati (Roma)
- J.Y. Huang
PAL, Pohang, Kyungbuk
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As the promise of X-ray Free Electron Lasers (FEL) comes close to realization, the creation and diagnosis of ultra-short pulses is of great relevance in the SASE FEL (Self-Amplified Spontaneous Emission) community. The VISA II (Visible to Infrared SASE Amplifier) experiment entails the use of a chirped electron beam to drive a high gain SASE FEL at the Accelerator Test Facility (ATF) in Brookhaven National Labs (BNL). The resulting ultra-short pulses will be diagnosed using an advanced FROG (Frequency Resolved Optical Gating) technique, as well as a double differential spectrum (angle/wavelength) diagnostic. Implementation of sextupole corrections to the longitudinal aberrations affecting the high energy-spread chirped beam during transport to the VISA undulator is studied. Start-to-end simulations, including radiation diagnostics, are discussed. Initial experimental results involving a highly chirped beam transported without sextupole correction, the resulting high gain lasing, and computational analysis are briefly reported.
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