This paper discusses several optical elements now in use at BL43LXU, the RIKEN Quantum NanoDynamics Beamline, of the RIKEN SPring-8 Center. BL43LXU is dedicated to meV-resolved inelastic x-ray scattering (IXS) using spherical analyzers operating between 15.8 and 25.7 keV. The work described here is relevant for setups on the high-resolution spectrometer (10m two-theta arm) with resolution between 2.8 and 0.8 meV. Specific optics discussed include a multilayer Kirkpatrick-Baez (KB) mirror pair that focuses the full (∼lx3mm2) beam at 17.79 keV to a 4.4 X 4.1 μm2 spot with ~60% throughput, two different types of Soller slits that help reduce backgrounds, masks for the analyzers that allow increased solid angle to be collected while preserving momentum resolution, and a diamond quadrant beam position monitor (BPM). These elements have been used for experiments in extreme conditions with diamond anvil cells, and liquid measurements at low momentum transfers, among other work.

Topics
Diamond anvil cells, Optical elements, Particle accelerators, X-ray scattering
1.
A. Q. R.
 
Baron
,
SPring-8 Inf. News1.
 
15
,
14
(
2010
).
2.
A. Q. R.
 
Baron
, in
Synchrotron Light Sources Free. Lasers Accel. Physics, Instrum. Sci.
, edited by
E.
 
Jaeschke
,
S.
 
Khan
,
J. R.
 
Schneider
, and
J. B.
 
Hastings
 (
Springer International Publishing
,
Cham
,
2016
), p.
1643
–
1757
. See also arXiv:1504.01098v4.
Google Scholar
Crossref
Search ADS
 
3.
D.
 
Ishikawa
,
H.
 
Uchiyama
,
S.
 
Tsutsni
,
H.
 
Fukni
, and
A. Q. R.
 
Baron
, in
Proc. SPIE - Int. Soc. Opt. Eng.
(
2013
).
4.
We use the term “venetian blind” slits to describe a set of slats (or flat plates) arranged in a geometry similar to venetian blind widow shades. The slits operate by rotating the slats about an axis centered in the middle of the slat to change the slit aperture. The axis locations are chosen so that when fully open the slats lie in the ~ 2mrad dead region between the analyzers and so do not occlude the beam, and when fully closed, the distance between the slat edges is ~2 mm. Arguably, this arrnagment could also be called persian blind slits, or slat-type slits, but here we use venetian as being a common/familiar choice.
5.
W.
 
Soller
,
Phys. Rev.
 
24
,
158
(
1924
).
https://doi.org/10.1103/PhysRev.24.158
Crossref
Search ADS
 
© 2019 Author(s).
2019
Author(s)