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Proceedings Paper

Optimizing x-ray mirror thermal performance using variable length cooling for second generation FELs
Author(s): Corey L. Hardin; Venkat N. Srinivasan; Lope Amores; Nicholas M. Kelez; Daniel S. Morton; Peter M. Stefan; Josep Nicolas; Lin Zhang; Daniele Cocco
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Paper Abstract

The success of the LCLS led to an interest across a number of disciplines in the scientific community including physics, chemistry, biology, and material science. Fueled by this success, SLAC National Accelerator Laboratory is developing a new high repetition rate free electron laser, LCLS-II, a superconducting linear accelerator capable of a repetition rate up to 1 MHz. Undulators will be optimized for 200 to 1300 eV soft X-rays, and for 1000 to 5000 eV hard X-rays. To absorb spontaneous radiation, higher harmonic energies and deflect the x-ray beam to various end stations, the transport and diagnostics system includes grazing incidence plane mirrors on both the soft and Hard X-ray beamline. To deliver the FEL beam with minimal power loss and wavefront distortion, we need mirrors of height errors below 1nm rms in operational conditions. We need to mitigate the thermal load effects due to the high repetition rate. The absorbed thermal profile is highly dependent on the beam divergence, and this is a function of the photon energy. To address this complexity, we developed a mirror cradle with variable length cooling and first order curve correction. Mirror figure error is minimized using variable length water-cooling through a gallium-indium eutectic bath. Curve correction is achieved with an off-axis bender that will be described in details. We present the design features, mechanical analysis and results from optical and mechanical tests of a prototype assembly, with particular regards to the figure sensitivity to bender corrections.

Paper Details

Date Published: 27 October 2016
PDF: 7 pages
Proc. SPIE 9965, Adaptive X-Ray Optics IV, 996505 (27 October 2016); doi: 10.1117/12.2235825
Show Author Affiliations
Corey L. Hardin, SLAC National Accelerator Lab. (United States)
Venkat N. Srinivasan, SLAC National Accelerator Lab. (United States)
Lope Amores, SLAC National Accelerator Lab. (United States)
Nicholas M. Kelez, SLAC National Accelerator Lab. (United States)
Daniel S. Morton, SLAC National Accelerator Lab. (United States)
Peter M. Stefan, SLAC National Accelerator Lab. (United States)
Josep Nicolas, SLAC National Accelerator Lab. (United States)
Lin Zhang, SLAC National Accelerator Lab. (United States)
Daniele Cocco, SLAC National Accelerator Lab. (United States)

Published in SPIE Proceedings Vol. 9965:
Adaptive X-Ray Optics IV
Stephen L. O'Dell; Ali M. Khounsary, Editor(s)

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