Principle of Microtron

 

Principle of Microtron

 

¡Principle

@In a microtron accelerator, the electrons revolve in a uniform magnetic field and accelerate each time they pass through the electric field of the accelerator cavity. Once the accelerated electrons reach a predefined energy level, they are expelled as a beam via an exit pipe to an external device.

 

 

 

 

¡Characteristic 1

@In our MICROTRON, as shown in the diagram above, the electron gun that generates the electrons is embedded in the accelerator cavity; this configuration has enabled us to simplify and miniaturize the system, compared with a conventional microtron.

 

 

 

 

¡Characteristic 2

@Linear accelerator (LINAC) accelerates electrons in a straight line, which increases the energy dispersion by 10%, resulting in a large focus size due to energy spread, even if a convergence magnet is used.

@Microtron, on the other hand, accelerates the orbiting electrons selectively, based on the energy level. This makes the acceleration efficient and limits the energy dispersion to only 2%. Unlike LINAC, there is no low-energy component. These principles make sub-millimeter X-ray focus point size possible.

 

 

 

Comparison microtron and linac

4MeV Microtron

 

4MeV Linac

 

mic
linac
mic_spectrum
linac_spectrum
1) Electrons are emitted by RF electric field. 1) Electrons are emitted by 25kV high voltage.
2) Electrons circulate under the uniform magnetic field and are accelerated passing through the cavity. 2) Electrons are pre-bunched by the buncher for matching the acceleration phase in the cavity.
3) Electrons are extracted by the magnetic shield channel after reaching the designed energy. 3) Electrons are accelerated passing through linear acceleration cells.
4)Electron energy is defined by the geometry between acceleration point, extraction channel and magnetic field. 4) Electrons are extracted through the exit hole. Electron energy is defined by the RF power.
*Lower energy electrons are not extracted. *Lower energy electrons are also accelerated.
*Energy spread is less than 2%. *Energy spread is more than 4%.

 

 

 

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