Multi-energy frequency-multiplying particle accelerator and method thereof

1. A multi-energy frequency-multiplying particle accelerator comprising:

a pulse power generation unit for generating N pulse signals with different power levels, N is equal to or greater than 2;

N microwave power generation units for, under the control of a control signal, generating N microwaves with different energy levels based on said N pulse signals, respectively;

a power mixing unit having N entrances and one exit and for inputting a corresponding microwave among said N microwaves from each of said N entrances and outputting said N microwaves from said one exit;

a particle beam generation unit for generating N particle beams in synchronization with said N microwaves; and

an accelerating unit for using said N microwaves to accelerate said N particle beams, respectively.

2. The multi-energy frequency-multiplying particle accelerator of claim 1 , further comprising a single synchronization unit arranged between said power mixing unit and said accelerating unit and adapted to synchronize the characteristic frequency of said accelerating unit with the operating frequency of each of said N microwave power generation units.

3. The multi-energy frequency-multiplying particle accelerator of claim 1 , further comprising N synchronization units arranged respectively between said N microwave power generation units and said power mixing unit and adapted to synchronize the characteristic frequency of said accelerating unit with the operating frequency of each of said N microwave power generation units, respectively.

4. The multi-energy frequency-multiplying particle accelerator of claim 2 , wherein said synchronization unit comprises:

an incident wave sampling waveguide which samples each of the N microwaves outputted from said one exit of said power mixing unit to obtain an incident wave;

a circulator which feeds each of the N microwaves into said accelerating unit and outputs a corresponding microwave reflected from said accelerating unit;

a reflected wave sampling waveguide which samples the reflected corresponding microwave to obtain a reflected wave;

an automatic phase-locking and frequency-stabilizing means which compares and analyzes said incident wave and said reflected wave and generates a synchro signal for synchronizing the characteristic frequency of said accelerating unit with the operating frequency of each of said N microwave power generation units, respectively; and

an absorbing load which absorbs the reflected wave outputted by said circulator.

5. The multi-energy frequency-multiplying particle accelerator of claim 3 , wherein each of said synchronization units comprises:

an incident wave sampling waveguide which samples the microwave outputted from a corresponding microwave power generation unit to obtain an incident wave;

a circulator which feeds said microwave into said power mixing unit and outputs the microwave reflected from said accelerating unit via said power mixing unit;

a reflected wave sampling waveguide which samples the reflected microwave to obtain a reflected wave;

an automatic phase-locking and frequency-stabilizing means which compares and analyzes said incident wave and said reflected wave and generates synchro signals for synchronizing the characteristic frequency of the microwave power generation units with the operating frequency of said accelerating unit , respectively; and

an absorbing load which absorbs the reflected wave outputted by said circulator.

6. The multi-energy frequency-multiplying particle accelerator of claim 4 , wherein said automatic phase-locking and frequency-stabilizing means comprises:

a variable attenuator for adjusting the amplitudes of said incident wave and said reflected wave and outputting an incident signal and a reflect signal;

a phase discriminator for adjusting the phases of said incident signal and said reflect signal and outputting a first voltage and a second voltage;

a preamplifier for amplifying the difference between said first and second voltages to output an adjust signal;

a servo amplifier for amplifying said adjust signal to output a drive signal; and

a channel selector for, under the control of a control signal, outputting said drive signal to a corresponding microwave power generation unit.

7. The multi-energy frequency-multiplying particle accelerator of claim 1 - 3 , wherein said pulse power generation unit comprises a single pulse power source which, under the control of a control signal, supplies power to said N microwave power generation unit in a time division manner.

8. The multi-energy frequency-multiplying particle accelerator of claim 1 - 3 , wherein said pulse power generation unit comprises N pulse power sources which, under the control of a control signal, supply power to said N microwave power generation unit, respectively, at different time points.

9. The multi-energy frequency-multiplying particle accelerator of claim 1 - 3 , wherein said particle beam generation unit comprises an electron gun for generating an electron beam and a gun power supply for supplying power to said electron gun.

10. The multi-energy frequency-multiplying particle accelerator of claim 1 - 3 , wherein said power mixing unit comprises N−1 mixing loops each of which has two entrances and one exit, where the length difference between the central arcs of the two microwave paths from one of the entrance to the other equals an integral multiple plus half of the wavelength of a guiding wave, the length difference between the central arcs of the two microwave paths from said one entrance to said exit equals an integral multiple of the wavelength of the guiding wave, and the length difference between the central arcs of the two microwave paths from said other entrance to said exit equals an integral multiple of the wavelength of the guiding wave.

11. A multi-energy frequency-multiplying particle accelerator comprising:

a pulse power generation unit for generating N pulse signals with the same power level, N is equal to or greater than 2;

N microwave power generation units for, under the control of a control signal, generating N microwaves with the same energy level based on said N pulse signals, respectively;

a power mixing unit having N entrances and one exit and for inputting a corresponding microwave among said N microwaves from each of said N entrances and outputting said N microwaves from said one exit;

a particle beam generation unit for generating N particle beams in synchronization with said N microwaves; and

an acceleration unit for using said N microwaves to accelerate said N particle beams, respectively.

12. A method of particle beam acceleration comprising steps of:

generating N pulse signals with different power levels, N is equal to or greater than 2;

generating N microwaves with different energy levels based on said N pulse signals, respectively, under the control of a control signal;

using a power mixing unit having N entrances and one exit to mix said N microwaves, where a corresponding microwave among said N microwaves is inputted from each of said N entrances and said N microwaves are outputted from said one exit;

generating N particle beams in synchronization with said N microwaves; and

using said N microwaves to accelerate said N particle beams, respectively.

13. A method of particle beam acceleration comprising steps of:

generating N pulse signals with the same power level, N is equal to or greater than 2;

generating N microwaves with the same energy level based on said N pulse signals, respectively, under the control of a control signal;

using a power mixing unit having N entrances and one exit to mix said N microwaves, where a corresponding microwave among said N microwaves is inputted from each of said N entrances and said N microwaves are outputted from said one exit;

generating N particle beams in synchronization with said N microwaves; and

using said N microwaves to accelerate said N particle beams, respectively.