Speaker
Description
This submission presents the process and outcome for the development of an optimised neutron beam slit aperture assembly. The Australian Centre for Neutron Scattering (ACNS) utilises slit assemblies to limit and shape neutron flow along the beamlines in the facility. Minimising the linear footprint and simplifying the operation of these assemblies allows additional equipment and/or technologies to be installed for use in scientific research. This project is one of many analogous projects to upgrade the facility by maximising the available space and implementing modern, efficient technologies. The project methodology is based upon the six-step engineering method adapted to typical project phases at the Australian Nuclear Science and Technology Organisation (ANSTO) as outlined below.
- Scoping,
- Preliminary Research,
- Concept Design,
- Options Analysis,
- Iterative Detailed Design,
- Design for Manufacture and Assembly,
- Manufacture and Assembly,
- Project Closure.
The project exhibited mechanical design and project management elements presenting unique opportunities and challenges. Bi-directional ball screws were implemented for the first time at ACNS to actuate the slit blades in symmetric pairs unlike in previous designs. This component reconfiguration enabled further optimisation opportunities resulting
in a beamline width reduction of 24% from 50 mm to 38 mm in the final prototype. The precision metrics from operational testing measured within the values specified in the User Requirements (1-micron accuracy, 0.1-micron resolution, and 0.5-micron repeatability) and the design solution cost approximately $17,000 less than the previous design equating to a 36.7% cost reduction. These results indicate that the prototype design is viable and will produce several distinct, cumulative improvements for ACNS in replacing the existing assemblies.
Key Words
Slit, aperture, design, project, ANSTO, ACNS, management, manufacture, assembly, mechanical