Patent Number: 
Section: claims

1. A method for adjusting a charged particle beam traversing along a charged particle beam path, comprising the steps of:providing a charged particle system, comprising:an accelerator;a beamline from said accelerator to an output nozzle; anda tray assembly;inserting a first tray into a first slot of said tray assembly, said first tray configured with a first insert comprising a patient specific charged particle beam adjustment material, said step of inserting further comprising the steps of:inserting a second tray into a second slot of said tray assembly; andinserting a third tray into a third slot of said tray assembly;after said step of inserting, longitudinally retracting said tray assembly along the charged particle beam path into a zone circumferentially defined by said output nozzle, said step of retracting further comprising the step of:prior to operation of said charged particle system, moving said first slot, said second slot, and said third slot of said tray assembly into the zone circumferentially defined by said output nozzle;attaching a second insert to said second tray prior to said step of retracting; andattaching a third insert to said third tray prior to said step of retracting, wherein each of said first insert, said second insert, and said third insert comprise any of:a patient specific range shifter element comprising a standard thickness of a charged particle beam slowing material;a patient specific ridge filter, comprising a charged particle beam focusing element; anda patient specific blocking material comprising an aperture therethrough, said blocking material blocking the charged particle beam outside of the aperture. 2. The method of claim 1, said step of inserting further comprising the steps of:establishing a first electromechanical connection between a first identifier element, affixed to said first tray, and a first receiver, affixed to said tray assembly; andsaid first identifier element communicating at least one property of said first insert to said charged particle system via said first electromechanical connection. 3. The method of claim 2, said step of communicating further comprising the step of:identifying a patient specific insert installed in said first tray using information digitally stored in said first identifier. 4. The method of claim 2, said step of communicating further comprising the step of:identifying a blank insert installed in said first tray using information digitally stored in said first identifier. 5. The method of claim 2, said step of communicating further comprising the step of:identifying all of: occupancy, type of insert, and slot position to a main controller of said charged particle system. 6. The method of claim 1, said step of retracting further comprising the step of:moving said first slot and not said second slot and not said third slot of said tray assembly into a zone circumferentially defined by said output nozzle. 7. The method of claim 1, said step of retracting further comprising the step of:substantially removing steric limitation of said tray assembly between said output nozzle and a patient. 8. The method of claim 2, said step of communicating further comprising the step of: directly communicating with a main controller of said charged particle system without communication through a sub-assembly not directly in communication with said main controller. 9. An apparatus for adjusting a charged particle beam traversing a charged particle beam path, comprising:a charged particle system, comprising:an accelerator;a beamline from said accelerator to an output nozzle; anda tray assembly longitudinally retractable along the charged particle beam path into a zone circumferentially defined by said output nozzle; anda first tray insertable into a first slot of said tray assembly, said first tray configured with a patient specific charged particle beam adjustment insert during use;a second patient specific tray insertable into a second slot of said tray assembly; anda third patient specific tray insertable into a third slot of said tray assembly,wherein said first slot comprises a first height at least ten percent larger than said second slot, wherein a difference in slot height removes errors associated with a first tray intended for said first slot being inserted into said second slot. 10. The apparatus of claim 9, said first slot further comprising:a lateral orientation, relative to the charged particle beam path through said output nozzle, for insertion of said first patient specific tray.