| Paper |
Title |
Page |
| TUPPH052 |
Future FEL Studies at the VISA Experiment in the SASE and Seeded Modes
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443 |
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- G. Andonian, M. P. Dunning, A. Y. Murokh, C. Pellegrini, S. Reiche, J. B. Rosenzweig
UCLA, Los Angeles, California
- M. Babzien, I. Ben-Zvi, V. Yakimenko
BNL, Upton, Long Island, New York
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The VISA (Visible to Infrared SASE Amplifier) experiment at BNL (Brookhaven National Laboratory) has previously demonstrated saturation at 840 nm in 2001. Further SASE studies, in 2003, have demonstrated an anomalously large bandwidth spread of the FEL spectrum due to off-angle emissions. This paper disseminates the current and future program of the VISA program at BNL. This includes a study of a seeded FEL, using a 1 micron YAG laser as a seed, and the accompanying diagnostics to characterize the radiation. Diagnostics include the double differential spectrometer, a mode converter to investigate the orbital angular momentum of light in the FEL, and an optical pepper-pot for coherence measurements. As usual, start-to-end simulations are presented.
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| TUPPH053 |
Magnetic Chicane Radiation Studies at the BNL ATF
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447 |
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- M. P. Dunning, G. Andonian, A. M. Cook, E. Hemsing, A. Y. Murokh, S. Reiche, J. B. Rosenzweig, D. Schiller
UCLA, Los Angeles, California
- M. Babzien, K. Kusche, V. Yakimenko
BNL, Upton, Long Island, New York
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Coherent edge radiation, emitted from the edges of chicane dipole magnets, has recently been observed at the Accelerator Test Facility at Brookhaven National Laboratory. Using the 60 MeV linac, a series of experiments has been performed to characterize the radiation, including measurements of the spectrum, angular distribution, and polarization. Details and results of the experiments and plans for future experiments are presented.
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| THPPH031 |
Commissioning of the SPARC Photo-Injector
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637 |
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- M. Bellaveglia, D. Alesini, S. Bertolucci, M. E. Biagini, R. Boni, M. Boscolo, M. Castellano, A. Clozza, L. Cultrera, G. Di Pirro, A. Drago, A. Esposito, M. Ferrario, L. Ficcadenti, D. Filippetto, V. Fusco, A. Gallo, G. Gatti, A. Ghigo, S. Guiducci, M. Incurvati, C. Ligi, M. Migliorati, A. Mostacci, L. Palumbo, L. Pellegrino, M. A. Preger, R. Ricci, C. Sanelli, F. Sgamma, B. Spataro, F. Tazzioli, C. Vaccarezza, M. Vescovi, C. Vicario
INFN/LNF, Frascati (Roma)
- A. Bacci, I. Boscolo, F. Broggi, S. Cialdi, D. Giove, M. Mauri, A. R. Rossi, L. Serafini
INFN-Milano, Milano
- L. Catani, E. Chiadroni, A. Cianchi, S. Tazzari
INFN-Roma II, Roma
- L. Giannessi, M. Quattromini, A. Renieri, C. Ronsivalle
ENEA C. R. Frascati, Frascati (Roma)
- M. Mattioli, P. Musumeci, M. Petrarca
INFN-Roma, Roma
- A. Perrone
INFN-Lecce, Lecce
- J. B. Rosenzweig
UCLA, Los Angeles, California
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The SPARC project is born to perform R&D activity headed to realize SASE-FEL experiments at 500nm and higher harmonic generation. The project foresees the realization of a high brightness photo-injector able to produce a 150-200MeV electron beam to drive FEL process inside a dedicated 14m long undulator. The machine is going to be assembled at LNF and its final configuration is made up of an RF gun, driven by a Ti:Sa laser, injecting into three SLAC type accelerating sections. Nowadays we are working in a photo-injector test phase, aiming to characterize the main hardware components and to investigate the behavior of the e-beam dynamics in the first meters of drift. To do this we utilize the emittance-meter, a home designed diagnostic device placed just after the RF gun, able to move 1.2 meters along the longitudinal axis to measure beam parameters. In this paper we report a more accurate description of the project, the status of the single systems constituting the machine and the most important results we obtained in the e-meter phase.
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| THPPH070 |
Optimum Beam Creation In Photoinjectors Using Space-Charge Expansion
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752 |
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- M. P. Dunning, A. M. Cook, R. J. England, J. B. Rosenzweig
UCLA, Los Angeles, California
- M. Bellaveglia, M. Boscolo, L. Catani, A. Cianchi, G. Di Pirro, M. Ferrario, D. Filippetto, G. Gatti, L. Palumbo, C. Vicario
INFN/LNF, Frascati (Roma)
- S. M. Jones
Jet Propulsion Laboratory, Pasadena, California
- P. Musumeci
INFN-Roma, Roma
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It has recently been shown that by illuminating a photocathode with an ultra-short laser pulse of appropriate transverse profile, a uniform density, ellipsoidally shaped bunch is dynamically formed, which then has linear space-charge fields in all dimensions inside of the bunch. We study here this process, and its marriage to the standard emittance compensation scenario that is implemented in most modern photoinjectors. It is seen that the two processes are compatible, with simulations indicating that a very high brightness beam can be obtained. The scheme has produced stimulus for a series of experiments at the SPARC injector at Frascati in 2006-2007. An initial time-resolved experiment has been performed involving Cerenkov radiation produced at an aerogel. We discuss the results of this preliminary experiment, as well as plans for future experiments to resolve the ellipsoidal bunch shape at low energy. Future measurements at high energy based on fs resolution RF sweepers are discussed, and prospects for using the very low longitudinal emittance beam in a future bunch compressor to produce 10 micron long beams are evaluated.
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