Patent ID: 8183801

Claim:
A method of generating radiation at multiple energies, comprising: sequentially providing first electric power and second electric power to a microwave power generator, the second electric power being different from the first electric power; sequentially generating by the power generator first radiofrequency power pulses having a first power at a first frequency and second radiofrequency power pulses having a second power different than the first power and a second frequency different than the first frequency, based at least in part, on the first and second electric powers; sequentially providing the first and second radiofrequency power pulses to resonant cavities of a single particle accelerator; matching the first frequency of the first radiofrequency power pulses to a first resonance frequency of the accelerator while providing the first radiofrequency power pulses to the accelerator; matching the second frequency of the second radiofrequency power pulses to a second resonance frequency of the accelerator different from the first resonance frequency while providing the second radiofrequency power pulses to the accelerator; injecting charged particles into the resonant cavities of the accelerator; sequentially accelerating by the accelerator first injected charged particles to a first energy at a first resonance frequency of the accelerator and second injected charged particles to a second energy at a second resonance frequency of the accelerator different from the first resonance frequency based, at least in part, on the first and second radiofrequency power pulses; and sequentially colliding the accelerated first and second injected charged particles with a target to generate radiation having first and second respective energies.