3 papers

title:	Status of UCLA IR FEL
format:	preprint
year:	1996
21 authors:	C. Pellegrini | G. Baranov | N. Barov | P. Davis | M. Fauver | B. Gitter | G. Hairapetian | S. Hartman | M. Hogan | S. Ivanchenkov | C. Joshi | A. Khlebnikov | P. Kwok | N. Luhmann | S. Park | J. B. Rosenzweig | K. Schenk | J. Smolin | P. Tran | G. Travish | A. Varfolomeev
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title:	The UCLA IR FEL project
format:	conference procceeding
conference:	14th International Free Electron Laser Conference
year:	1993
21 authors:	G. Baranov | N. Barov | P. Davis | M. Fauver | B. Gitter | G. Hairapetian | S. Hartman | M. Hogan | S. Ivanchenkov | C. Joshi | A. Khlebnikov | P. Kwok | N. Luhmann | S. Park | C. Pellegrini | J. B. Rosenzweig | K. Schenk | J. Smolin | P. Tran | G. Travish | A. Varfolomeev
abstract:	A 10.6 mu m free electron laser (FEL) operating in the high gain regime is under construction at UCLA. FEL physics significant to future short wavelength operation is emphasized including optical guiding, superradiance, saturation and self-amplified spontaneous emission (SASE). A 5 MeV RF photocathode gun illuminated by a UV laser supplies a high brightness electron beam which is injected into a plane wave transformer (PWT) linac for acceleration to 20 MeV. Recent measurements of the gun emittance as well as quantum efficiency are presented. The undulator is of a modified hybrid design producing approximately 7.5 kG peak field on axis with 5 mm gap spacing and 1.5 cm pole period. Simulation results which include three-dimensional effects are furnished. The present status and future plans of the project are summarized. (16 References).
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title:	Large-field-strength short-period undulator design
format:	conference procceeding
conference:	13th International Free Electron Laser Conference
year:	1992
6 authors:	Varfolomeev, A. A. | S. N. Ivanchenkov | A. S. Khlebnikov | C. Pellegrini | Baranov, G. A. | Michailov, V. I.
abstract:	A high-quality strong-field hybrid undulator has been designed for an infrared FEL project to be performed at UCLA. The primary magnetic flux is provided by C-shaped vanadium-permendur yokes and SmCo_5 magnets. An additional magnetic flux is supplied by thin NdFeB magnet blocks placed between the yoke poles. This magnet geometry provides a high saturation limit for the magnetic field in the gap area. With the 15 mm period and 5 mm gap a peak on-axis field of 7.3 kG has been achieved. The undulator contains 40 periods. The high accuracy of the yoke poles alignment along with the ability to move the thin permanent magnet blocks provides an on-axis magnetic field accuracy better than 0.5%. (9 References).
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