The new Micro Computed Tomography (MCT) beamline is the first instrument to become operational as part of the AU$94 million Project BRIGHT programme, which will see the completion of eight new beamlines at ANSTO’s Australian Synchrotron. The BRIGHT beamlines greatly expand the investigational power and throughput of the Australian Synchrotron with new capabilities not covered by existing instruments.
Despite a series of setbacks and delays because of the COVID-19 pandemic, a team of instrument scientists, engineers, project officers, and technicians achieved first light on MCT on 21 November 2021 at 8:32 pm. It is a significant technical achievement that is captured and recorded for posterity with a black and white image of the ‘beam,’ which means the synchrotron light has been successfully directed from the main ring to the new beamline.
Micro-CT uses X-rays produced by the Australian Synchrotron to reveal a detailed picture of the inside of an object, slice by slice, non-destructively. The instrument produces a series of projected images captured sequentially while the sample is rotated. Using high-performance computing infrastructure and software, a three-dimensional object can be reconstructed from the projected images.
While similar to a hospital CT or CAT scan, more powerful synchrotron light on MCT can deliver high-resolution 3D images of small samples, including bone, minerals, biomass for biofuels, 3D printed components, textiles, and fossils, among others, Dr Andrew Stevenson, the Lead Instrument Scientist, MCT stated.
A small team of scientists from CSIRO, led by Senior Research Scientist Dr Sherry Mayo, ran the first user experiment on the beamline to investigate how gas under pressure permeated the pores in samples of coke and coal last week.
The researchers produced an intricately detailed 3D reconstruction of a piece of coal about 9 millimetres in size with a complex network of openings known as pores. With the reconstruction, it is possible to get important quantitative measures, such as internal surface area, connectivity of pores, size distribution and shape of pores. The team is now refining results using comprehensive data analysis.
CSIRO was first off, the rank owing to a preferred access scheme to organisations that funded Project BRIGHT. Other users can apply to use the instrument through a merit-based scheme. The ability to use non-ambient sample environments, such as to change pressure and temperature to simulate environmental conditions, will enhance the analytical power of the instrument.
Suitable for sub-micron scale studies, MCT complements the existing Imaging and Medical Beamline, which is used for larger objects. The future development of MCT will extend the imaging capabilities to nanoCT on commensurately smaller samples.
MCT can accommodate samples that are up to 10 mm high × 64 mm wide. The effective field of view will also be increased in the future via ‘stitching.’ The wide variety of experimental configurations, designed in response to the requirements of a diverse user community, will be achieved using five different X-ray imaging detector systems.
The beamline has three separate hutches: the first is to prepare/condition the X-ray beam and deliver it to the second or third hutch for user experiments. The two hutches provide a variety of imaging modalities and support further development. For example, the use of a robot for automated sample exchange. The robot can pick up barcoded samples from a mount with a gripper and position the sample for imaging.
Seven more research teams, including one from ANSTO, have scheduled time to use MCT before the end of the year. These projects have been separated with intervals when the MCT team can continue with aspects of hot commissioning. This also provides the team with the opportunity to capitalise on learnings from the conducted experiments for the benefit of users to come.
