A multi-field cancer therapy apparatus and method of use thereof is described increasing dimensionality of incident tumor treatment angles while minimizing distance between a final beamline focusing magnet and the patient. Increased dimensionality of incident tumor treatment angles is achieved through coordinated use of one or more of: a rotatable targeting magnet; a first patient rotation platform rotating the patient around, without intersecting, a vertical axis; a second patient rotation platform rotating a body part through a movable vertical axis; and patient tilt. The increased charged particle incident angle dimensionality distributes Bragg peak tail energy about the tumor. Dynamic energy and/or intensity control of the charged particle beam as a function of efficiency of beam delivery based on tumor shape further reduces Bragg peak tail energy delivered to healthy tissue about the tumor.