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Characterising the large coherence length at diamond’s beamline I13L
Authors:
U. H.
Wagner
(Diamond Light Source)
,
A.
Parsons
(Diamond Light Source)
,
J.
Rahomaki
(KTH Royal Institute of Technology)
,
U.
Vogt
(KTH Royal Institute of Technology)
,
C.
Rau
(Diamond Light Source; Northwestern University)
Co-authored by industrial partner:
No
Type:
Conference Paper
Conference:
Proceedings of the 12th International Conference on Synchrotron Radiation Instrumentation – SRI2015
Peer Reviewed:
No
State:
Published (Approved)
Published:
July 2016
Abstract: I13 is a 250 m long hard x-ray beamline (6 keV to 35 keV) at the Diamond Light Source. The beamline comprises of two independent experimental endstations: one for imaging in direct space using x-ray microscopy and one for imaging in reciprocal space using coherent diffraction based imaging techniques [1]. An outstanding feature of the coherence branch, due to its length and a new generation of ultra-stable beamline instrumentation [2], is its capability of delivering a very large coherence length well beyond 200 μm, providing opportunities for unique x-ray optical experiments. In this paper we discuss the challenges of measuring a large coherence length and present quantitative measurement based on analyzing diffraction patterns from a boron fiber [3]. We also discuss the limitations of this classical method in respect to detector performance, very short and long coherence lengths. Furthermore we demonstrate how a Ronchi grating setup [4] can be used to quickly establish if the beam is coherent over a large area.
Journal Keywords: Coherence; Coherence imaging; Optical fiber testing; X-ray diffraction; Optical coherence
Subject Areas:
Physics
Technical Areas:
Insertion Devices