@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.
@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 electron gun.
@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.
|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%.|