metallic guides
3D CAD model - m-values color coded
in-pile guide assembly – NIST monolith #0
For the in-pile section of the new neutron guide system at the NCNR at the National Institute for Standards and Technology (NIST), the customer decided using the latest technology for metallic guides uniquely provided by SwissNeutronics. This guide assembly is located at a distance of about 1440 mm from the moderator. Since this region is subject to an increased thermal and radiation load, it was desired to fabricate it from aluminum substrates.
A complex geometry and various m-values from 1.2 to 3.6 were required to match the phase space of the subsequent neutron guides. The fabrication of the guide assembly was performed including the sophisticated super-polishing, supermirror coating with reflectivity measurements of all substrates and highly accurate assembly.
photographs of monolith #0
- type: guide assembly (common guide in front of the subsequent individual guides)
- path/profile: multi-axis, straight
- cross-sections: 151 × 157mm˛ → 223 × 157mm˛ (entrance/exit, respectively)
- length: 933 mm
- coating: Ni/Ti, m = 1.2 → 3.6
- substrate: super-polished aluminum
A more comprehensive report about this project can be found in our Newsletter from Dec-2009.
reflectivitiy of supermirror coatings on aluminum substrates for monolith #0
