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Proceedings Paper

The optical design of the soft x-ray self-seeding at LCLS
Author(s): Daniele Cocco; Rafael Abela; John W. Amann; Ken Chow; Paul J. Emma; Yiping Feng; Georg L. Gassner; Jerome Hastings; Philip Heimann; Zhirong Huang; Henrik Loos; Paul A. Montanez; Daniel Morton; Heinz-Dieter Nuhn; Daniel F. Ratner; Larry N. Rodes; Uwe Flechsig; James J. Welch; Juhao Wu
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Paper Abstract

After the successful demonstration of the hard X-ray self-seeding at LCLS, an effort to build a system for working in the soft X-ray region is ongoing. The idea for self-seeding in the soft X-ray region by using a grating monochromator was first proposed by Feldhauset. al. The concept places a grating monochromator in middle of the undulators and selects a narrow bandwidth “seed” from the SASE beam produced by the upstream section of undulators, which is then amplified to saturation in the downstream section of the undulators. The seeded FEL beam will have a narrower bandwidth approaching the transform limit. The challenge is to accommodate a monochromator and refocusing system as well as the electron beam magnetic chicane into a very limited space. The Soft X-raySelf Seeding system replaces only a single undulator section of ~ 4 m. Theoverall project and the expected FEL performances are described elsewhere. Here we present the detailed optical design solution, consisting of a fixed incidence angle toroidal blazed grating with variable groove density, a rotating plane mirror (the only required motion for tuning the energy) to redirect the selected monochromatic beam onto an exit slit, and two more mirrors, one sphere and one flat, to focus and overlap the ‘seed’ onto the electron beam in the downstream undulators.

Paper Details

Date Published: 30 September 2013
PDF: 8 pages
Proc. SPIE 8849, X-Ray Lasers and Coherent X-Ray Sources: Development and Applications X, 88490A (30 September 2013); doi: 10.1117/12.2024402
Show Author Affiliations
Daniele Cocco, SLAC National Accelerator Lab. (United States)
Rafael Abela, Paul Scherrer Institut (Switzerland)
John W. Amann, SLAC National Accelerator Lab. (United States)
Ken Chow, Lawrence Berkeley National Lab. (United States)
Paul J. Emma, Lawrence Berkeley National Lab. (United States)
Yiping Feng, SLAC National Accelerator Lab. (United States)
Georg L. Gassner, SLAC National Accelerator Lab. (United States)
Jerome Hastings, SLAC National Accelerator Lab. (United States)
Philip Heimann, SLAC National Accelerator Lab. (United States)
Zhirong Huang, SLAC National Accelerator Lab. (United States)
Henrik Loos, SLAC National Accelerator Lab. (United States)
Paul A. Montanez, SLAC National Accelerator Lab. (United States)
Daniel Morton, SLAC National Accelerator Lab. (United States)
Heinz-Dieter Nuhn, SLAC National Accelerator Lab. (United States)
Daniel F. Ratner, SLAC National Accelerator Lab. (United States)
Larry N. Rodes, Lawrence Berkeley National Lab. (United States)
Uwe Flechsig, Paul Scherrer Institut (Switzerland)
James J. Welch, SLAC National Accelerator Lab. (United States)
Juhao Wu, SLAC National Accelerator Lab. (United States)


Published in SPIE Proceedings Vol. 8849:
X-Ray Lasers and Coherent X-Ray Sources: Development and Applications X
Annie Klisnick; Carmen S. Menoni, Editor(s)

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