BM-D

The HPCAT 16-BM-D beamline is dedicated to micro-x-ray diffraction (μ-XRD) and x-ray absorption spectroscopy (XAS) research of matters under high pressure, typically contained in a diamond anvil cell (DAC). The setup is flexible for various experimental conditions including ambient, resistive heating, and cryogenic cooling environments. On-line microscope and Ruby fluorescence spectroscopy system is available for sample alignment and in-situ pressure calibration, respectively. Double-diaphragm membrane or gear box is used for remote pressure control. High-pressure powder diffraction, single crystal diffraction, and x-ray absorption spectroscopy are the established techniques. Multi-grain crystallography and anomalous X-ray scattering techniques are under commissioning. The transmission-mode XAS can be readily combined with diffraction so that combined XRD-XAS study can be performed simultaneously.

Phone:  (630) 252-1916

Beamline scientists:
Changyong Park
Phone: (630) 252-0477      E-mail: cpark@ciw.edu
Dmitry Popov
Phone: (630) 252-7106      E-mail: dpopov@ciw.edu

 

Major (beamline) features

Feature

Description

Source

Bending magnet monochromatic beam

Monochromator

Si (111) double crystal in pseudo-channel-cut mode

Energy range

6-45 keV (normal), up to 60-70 keV (per request)

Beam size & focusing optics

5 μm (H) x 5 μm (V) FWHM,  20 μm (H) x 30 μm (V) full beam
320 mm Pt-coated Si KB-type mirrors

Flux at sample position

5 x 108 photons/sec at 30keV

Established techniques

Micro X-ray Diffraction (µ-XRD)
Single Crystal X-ray Diffraction (SXD)
X-ray Absorption Spectroscopy (XAS)
Multi-grain Single Crystal X-ray Diffraction (commissioning)
Anomalous X-ray Scattering/Diffraction (commissioning)

Detectors

Mar345 Image Plate (stationary)
MarCCD, Perkin-Elmer detector (per request)
Pilatus 1M (per request)

Support equipment

On-line Ruby/Microscope system
Membrane Diaphragm or gear-box control system
Cryostats (10 K with cold-finger type; 4.2K with liquid He flow type)
External resistive heating (with remote temperature control)
Ion-chambers (for AXS measurement)

 

Technique highlights

-          General high-pressure X-ray diffraction
-          Single-crystal X-ray diffraction
-          X-ray absorption spectroscopy
-          Anomalous X-ray scattering/diffraction (under development)
-          Mutligrain crystallography (under development)

Beamline notes

-          Beamline overview
-          Clean-up pinholes
-          Beam focusing
-          Monochromator
-          MAR345S fast mode operation

Operation manual

-          16-BM-D General User Manual
-          16-BM-D Quick Guide and Trouble Shooting
-          16-BM-D Mar 345 Image Plate Guide
-          16-BM-D SXD Measurement Guide

Data reduction and evaluation software

-          Dioptas (Clemens Prescher)
-          Fit2D (ESRF)
-          X-ray Helper (HPCAT)
-          CMPR
-          XDS
-          Athena, Artemis, Hephaestus, etc. (XAS analysis)