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- W2053837195 abstract "The range of parameters used in both working and proposed free electron lasers (FELs) has greatly expanded in recent years. Future machines are envisioned as fourth generation light sources providing researchers with high brightness, short wavelength, coherent radiation [see Ref. [1]: Report on the Workshop on Fourth Generation Light Source SLAC, Stanford CA, USA (February, 1992)]. Short wavelength operation, along with the long undulator required to produce high brightness photon beams in these devices, places tight requirements on the electron beam quality. In particular, the need to maintain a well focused beam is critical to successful operation of such an FEL. This paper examines the use of alternating gradient (AG) sextupole focusing in planar undulators. The equations of motion for an electron in an undulator field with a strong sextupole component are examined. Analytic as well as smooth approximation solutions are provided for AG sextupole focusing. It is shown that the mean electron longitudinal velocity can be kept constant through each focusing and defocusing section, but that the velocity differs between these sections. The effects of this stepwise velocity modulation as well as the beam size variation are explored computationally and compared to theory. Examples using the proposed SLAC 4 nm FEL, the UCLA 10.6 μm FEL as well as a Paladin based device are also given." @default.
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- W2053837195 date "1994-07-01" @default.
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- W2053837195 title "Strong sextupole focusing in planar undulators" @default.
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- W2053837195 doi "https://doi.org/10.1016/0168-9002(94)90519-3" @default.
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