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Octant An octant starts in the center of an arc and goes to the center of the next downstream arc. An octant consists of an upstream and a downstream half-octant. A half-octant and a half-sector cover the same part of the machine even though they may not have the same number.
Optical configuration An optical configuration refers to a certain powering of the LHC magnets. Each optics version has several optical configurations corresponding to the different operation modes of the LHC. For example, each optics version has different optical configuration for injection and luminosity operation and for the luminosity operation the optics features different optical configurations corresponding to different β* values in the four experimental insertions of the LHC.
Optics version The optics version refers to a consistent set of optical configurations. There can be several different optics versions for one lattice version.

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