3 papers

title:	Visible-infrared self-amplified spontaneous emission amplifier free electron laser undulator
format:	unknown
year:	2001
17 authors:	R. Carr | M. Cornacchia | P. Emma | Nuhn, H. D. | Poling, B. | Ruland, R. | E. Johnson | G. Rakowsky | Skaritka, J. | Lidia, S. | Duffy, P. | M. Libkind | Pedro Frigola | A. Murokh | C. Pellegrini | J. B. Rosenzweig | A. Tremaine
abstract:	The visible-infrared self-amplified spontaneous emission amplifier (VISA) free electron laser (FEL) is an experimental device designed to show self-amplified spontaneous emission (SASE) to saturation in the near infrared to visible light energy range. It generates a resonant wavelength output from 800?600 nm, so that silicon detectors may be used to characterize the optical properties of the FEL radiation. VISA is designed to show how SASE FEL theory corresponds with experiment in this wavelength range, using an electron beam with emittance close to that planned for the future Linear Coherent Light Source at SLAC. VISA comprises a 4 m pure permanent magnet undulator with four 99 cm segments, each of 55 periods, 18 mm long. The undulator has distributed focusing built into it, to reduce the average beta function of the 70?85 MeV electron beam to about 30 cm. There are four FODO cells per segment. The permanent magnet focusing lattice consists of blocks mounted on either side of the electron beam, in the undulator gap. The most important undulator error parameter for a free electron laser is the trajectory walk-off, or lack of overlap of the photon and electron beams. Using pulsed wire magnet measurements and magnet shimming, we were able to control trajectory walk-off to less than
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title:	The VISA FEL Undulator
format:	conference procceeding
conference:	20th International Free Electron Laser Conference
year:	1999
14 authors:	R. Carr | Ben-Zvi, I. | Bertolini, L. | M. Cornacchia | P. Emma | Pedro Frigola | E. Johnson | M. Libkind | Lidia, S. | Nuhn, H. D. | C. Pellegrini | G. Rakowsky | J. B. Rosenzweig | Ruland, R.
abstract:	The Visible-Infrared SASE Amplifier (VISA) FEL is an experimental device designed to show self amplified spontaneous emission (SASE) to saturation in the 800-600 nm range, where silicon detectors may be used to characterize the optical properties of the FEL radiation. VISA is the first SASE FEL designed to saturate, and its diagnostics will provide important checks of theory.
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title:	UCLA-KIAE focusing permanent magnet undulator for SASE experiment
format:	conference procceeding
conference:	19th International Free Electron Laser Conference
year:	1998
9 authors:	Osmanov, N. | Tolmachev, S. | A. Varfolomeev | Varfolomeev, A. A., Jr. | Pedro Frigola | Hogan, M. | C. Pellegrini | R. Carr | Lidia, S.
abstract:	A description of a new 2 m undulator is presented which was specially designed and manufactured for a SASE mode FEL experiment. It is a one section two plane focusing permanent magnet construction. The uniform period length is 2.06 cm, total number of periods is 98. The peak field on the axis is 5.4 kG for a 5 mm gap. (8 References).
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