Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Built Environment (hierarchy name)
4. Single Built Works (hierarchy name)
5. single built works (built environment)
6. [single built works by specific type]
7. [single built works by function]
8. research structures
9. particle accelerators

Anotations

Scope note:

Designates structures in which charged particles, generally subatomic particles such as protons or electrons, are accelerated by means of an alternating electric field whose frequency is kept constant to remain synchronous with the particles.They are confined to a closed circular orbit by a changing magnetic field, the strength of which is increased to keep the path’s radius constant as the particles gain mass and their momentum increases.