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Nearly copropagating sheared laser pulse FEL undulator for soft x-rays

A conceptual design for a soft x-ray free-electron laser (FEL) using a short-pulsed, high energy near infrared laser undulator and a low-emittance modest-energy (∼170 MeV) electron beam is described. This low-cost design uses the laser undulator beam in a nearly copropagating fashion with respect to...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 2013-08, Vol.46 (32), p.325501-1-11
Main Authors: Lawler, J E, Bisognano, J, Bosch, R A, Chiang, T C, Green, M A, Jacobs, K, Miller, T, Wehlitz, R, Yavuz, D, York, R C
Format: Article
Language:English
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Summary:A conceptual design for a soft x-ray free-electron laser (FEL) using a short-pulsed, high energy near infrared laser undulator and a low-emittance modest-energy (∼170 MeV) electron beam is described. This low-cost design uses the laser undulator beam in a nearly copropagating fashion with respect to the electron beam, instead of the traditional 'head-on' fashion. The nearly copropagating geometry reduces the Doppler shift of scattered radiation to yield soft, rather than hard x-rays. To increase the FEL gain a sheared laser pulse from a Ti : sapphire or other broadband laser is used to extend the otherwise short interaction time of the nearly copropagating laser undulator beam with a relativistic electron beam.
ISSN:0022-3727
1361-6463
DOI:10.1088/0022-3727/46/32/325501