The spherical chambers are equipped with CF (ConFlat® style) borders an are the first choice for that applications that need a radial units installation as in pulse laser deposition or surface sciences.
This type of chamber have more than one port for radiation/particle sources or cogent instrumentation pointed at the sphere’s center or sme others important primary points.
With a good surface preparation and pumping, this kind of chambers can catch up pressures in the UHV range.