Charged particle cancer therapy installation system

A method for installing a cancer therapy system in a hospital related brownfield building, comprising the steps of:

• transporting sectional elements of a gantry system from a first floor of the hospital related brownfield building to a lower floor, said gantry system comprising:
• a set of bearings;
• a rotatable gantry support, rotatable on said set of bearings, comprising a first rotatable gantry section and a second rotatable gantry section;
• a gantry counterweight comprising a first counterweight section and a second counterweight section, said gantry counterweight attachable to said rotatable gantry support;
• a rotatable gantry arm, comprising:
• a first rotatable arm section attachable to said rotatable gantry support;
• a second rotatable arm section, attachable to said first rotatable arm section, circumferentially surrounding a section of a charged particle beamline;
• and a third rotatable section attachable to at least one of said set of bearings;
• said set of bearings comprising a main bearing, said main bearing comprising:
• a diameter of at least ten feet;
• a first circular segment, comprising a first arc-to-chord section;
• a second circular segment, comprising a second arc-to-chord section;
• and
• an intermediate section;
• transporting through a pre-existing elevator shaft in the hospital related brownfield building said main bearing in a disassembled form;
• and
• after said step of transporting through said pre-existing elevator shaft, assembling said gantry system on the lower floor, said step of assembling comprising attaching said first circular segment of said main bearing to said second circular segment of said main bearing using said intermediate section.