Charged particle beam injector and charged particle beam injection method

A charged particle beam injection method comprising steps of:

• generating first nuclide ions in a first ion source;
• linearly accelerating the first nuclide ions by using a first linear accelerator to form a first charged particle beam;
• generating second nuclide ions in a second ion source;
• linearly accelerating the second nuclide ions by using a second linear accelerator to form a second charged particle beam;
• injecting one of the first charged particle beam and the second charged particle beam into an inflector of a main accelerator by setting of a switching electromagnet,
• wherein the method further comprising:
• bending the first nuclide ions by electromagnetic force and injecting the first nuclide ions into the first linear accelerator by using a first extraction electromagnet;
• bending the second nuclide ions by electromagnetic force and injecting the second nuclide ions into the second linear accelerator by using a second extraction electromagnet;
• generating third nuclide ions in a third ion source;
• and
• bending the third nuclide ions by electromagnetic force, then causing the third nuclide ions to pass straight through the first extraction electromagnet or the second extraction electromagnet, and then injecting the third nuclide ions into the first linear accelerator or the second linear accelerator, by using a third extraction electromagnet.