Matter and Radiation at Extremes, Volume. 5, Issue 1, 018403(2020)
New developments in high-pressure X-ray diffraction beamline for diamond anvil cell at SPring-8
Fig. 1. Energy spectra of the photon flux at a distance of 29 m from the X-ray source in a 0.5 × 0.5 mm2 slit aperture corresponding to the new in-vacuum variable-gap undulator installed at the BL10XU beamline. The spectra were calculated using
Fig. 2. (a) X-ray focusing device system installed in OH at a distance of 42 m from the X-ray source. (b) Focusing device unit of the GC and Al CRLs. The unit consists of six lens assemblies housing the individual GC and Al CRLs, which contain (8, 16, 32, 64, 64, 64) and (4, 8, 16, 32, 56, 64) lens elements, respectively. The focused X-ray energy and the focal length can be varied by changing the combinations of the lens assembly. The SU8 CRL for submicrometer focusing has a fixed focal length of 7200 mm (see mode III in
Fig. 3. Optical setup for X-ray focusing at 30 keV with compound refractive lens (CRL) devices at the BL10XU beamline. Mode I: single focusing setup using a collimation lens (CRL1 or CRL2) in the OH and CRL4 downstream focusing. Modes II and III: two-stage refractive focusing setup for generating 2–3
Fig. 4. Intensity profiles of the focused beam measured by knife-edge scanning at 30 keV at the EH2 sample position in focusing mode III: (a) horizontal focusing; (b) vertical focusing. Open and solid circles represent the raw data and numerical differentiation of the raw profile, respectively. A Gaussian fit (thick lines) of the derivative yielded a spot size of 1.0 and 1.1
Fig. 5. (a) Microphotograph of iron in a DAC during laser heating at 5 GPa and 1500 K. (b) High-pressure scanning XRD patterns across the sample from the center to the top in 4
Fig. 6. (a) High-pressure and low-temperature facility in the EH1. (b)
Fig. 7. (a) Overall view of cryostat system combined with the XRD and Raman scattering systems in EH1 at the BL10XU beamline. The green and white lines indicate the optical path of the Raman scattering measurement and the X-ray beam path, respectively. A 4K-GM cryostat with a DAC mounted on the goniometer stage is located on the heavy-duty multiaxial translation stage. (b) Cryostat DAC holder connected via a flexible bundle of copper wires to the cold stage. (c) Schematic of the low-vibration cryostat with a DAC. The DAC holder is rigidly fixed to the cryostat shield via a stainless-steel rod.
Fig. 8. (a) Energy-domain synchrotron radiation 57Fe-Mössbauer spectroscopy system in EH1 at the BL10XU beamline. (b) Schematic of the optical system used for 57Fe-Mössbauer spectroscopy combined with synchrotron XRD. HRM, high-energy resolution monochromator consisting of nested-type channel-cut Si(511) and Si(975) crystals; NMC, nuclear monochromator crystal of 57FeBO3 near the Néel temperature and in an external magnetic field.
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N. Hirao, S. I. Kawaguchi, K. Hirose, K. Shimizu, E. Ohtani, Y. Ohishi. New developments in high-pressure X-ray diffraction beamline for diamond anvil cell at SPring-8[J]. Matter and Radiation at Extremes, 2020, 5(1): 018403
Category: High Pressure Physics and Materials Science
Received: Aug. 28, 2019
Accepted: Dec. 8, 2019
Published Online: Feb. 18, 2020
The Author Email: Hirao N. (hirao@spring8.or.jp)