High Pressure Beamline
|Technique:||High pressure Angle dispersive x-ray diffraction using diamond anvil-cell and resistive heating; In-situ SAXS/WAXS measurements in extreme environments|
|Energy:||Monochromatic beam with tunable x-ray energy|
|Detectors:||Large area Mar345 detectors; Several detectors sharing at CHESS available upon early request|
B1 station has been combined with B2 station and merged to form one versatile station. This upgraded station has expanded the experimental capabilities for x-ray scattering measurements of samples under extreme conditions of pressure and temperature from only the wide angle to both wide and small angle regions. The expanded hutch space over 4 meter long further enables development of new in-situ techniques using a series of solid and portable instruments.
The improved research capabilities include the rotation stage for side x-ray diffraction, laser-excited Raman and photoluminescence spectroscopy, Uv-vis-NIR absorption and reflection spectroscopy, two large-area Mar345 detector control system, high temperature and high pressure tuning systems, in-situ optical imaging system, three meter long optical table with different setups etc.
The on-site and off-site High Pressure and High Temperature Facilities exist to provide experimental support for high pressure experiments with diamond anvil cells that are also implemented at high temperature conditions. In these cells with variable configurations, pressures from around 0.1 GPa (1 kbar) to well over 300 GPa (3 Mbar) can be generated. With electrical resistance heating and inert gas flow, one high temperature DAC allows heating the sample into DAC to the temperature of 1100 K. The facility has stages for mounting DACs permanently installed in the B1 hutch. Upon request, a micro-optical system for in situ pressure, temperature, and Raman spectroscopy measurements can be installed in the hutch before conducting synchrotron-based measurements.
Several off-site instruments enable loading of gases and samples into DAC cells for performing high pressure studies at hydrostatic and quasi-hydrostatic conditions. A large room serves users for the sample preparation and off-site works. These instruments include: 1) one micro-drill press and microscope for precise drilling of the DAC gasket; 2) one EDM for drilling of high strength metal gaskets; 3) one microscopy with light source for loading sample into DAC; 4) one photographable and stereomicroscopy for in-situ visualization and imaging of pressurizing sample; 5) one high temperature oven for the sample heating treatment; 6). One spare micro-optical system for pressure, temperature, and Raman spectroscopy measurements in case of multiple user groups attended; 7) one Uv-vis-NIR spectroscopy for absorption and reflection measurements; 8) miniature solid state laser (532nm) source for illuminating the ruby or the sample for spectroscopy measurements.