NSLS-II Seminar

"Recent Developments in X-ray Refractive Optics at the ESRF"

Presented by Anatoly Snigirev, European Synchrotron Radiation Facility, ESRF, France

Monday, March 29, 2010, 10:30 am — Bdlg. 703, Large Conference Room

The presentation is intended to review the most recent developments of hard X-ray micro- and nano- focusing optics at the ESRF. The main emphasis will be given to the performance of refractive optics. As in-line optics, compound refractive lenses do not change the direction of x-ray beam. They can be easily incorporated at almost any beamline providing collimating or focusing option. X-ray transfocators as energy tuneable refractive optical systems were recently developed at the ESRF. The transfocator is a lens assembly whose focal length can be continuously adjusted by the mechanical movement of one or more groups of individual parabolic lenses. These devices are simple to align, allow good working distance between the optics and the sample, and are becoming standard elements in synchrotron beamlines instrumentation.

In the last few years a rapid progress in the fabrication of X-ray refractive optics using MEMS micro-electronics technology has opened the possibility of developing planar nanofocusing lenses. Driven by the requirements of new 100 m-long beamlines at the ESRF we have designed, manufactured and tested planar parabolic lenses made of silicon that have a short focal distance in the energy range of 10 and 100 keV. In addition to nanofocusing lenses each lens-chip contains a set of bi-lens interferometers enabling on-line coherence characterization of the incoming beam. The optical tests of the new lenses were performed at the Instrumentation Test ID6 beamline using the Micro-optics test bench (MOTB). The MOTB is a versatile instrument capable of high resolution X-ray optics characterization, coherence and stability measurements. The current status of the MOTB end station will briefly be described.

Hosted by: Oleg Chubar

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