The different industrial properties are due to the different principles of electron acceleration. In the ELVs, high voltage is produced by a high voltage transformer, and charged particles are accelerated in a constant electric field. More precisely, the ELVs have a potential electric field that either remains constant over time or changes slightly during the acceleration of any single particle. The main elements of these accelerators are a high voltage generator, an injector, and an accelerating tube. The assembly parts of all the types of the ELV accelerators are unified; it is only the size of the facility itself and that of the exhaust unit that may differ.
The ELV accelerators produce a continuous electron beam. It can also be released into the atmosphere as a thin beam with a diameter of 1–2 mm. Because of the high thermal energy density of the beam, the device can be used for metal processing and in nanotechnological processes (e.g., for the production of nanopowders).
In the ILU-type accelerators, electrons are boosted by the alternating electric field induced by high-frequency resonators, and the electron beam is pulsed rather than constant. The main elements are an electron injector, a resonator, and one or more RF generators.
The INP has also developed for the ILU-type accelerators a converter of the electron beam energy into bremsstrahlung energy. This type of radiation field allows for the processing of items of large mass thickness (e.g., packaged items, bagged foods, etc.).
Imagine that you have a product you need to irradiate and two accelerators: an ELV and an ILU. Which one will you choose?
In the case of mass production of thin and light items, you should choose an ELV. This type of accelerators have a low energy (hence the thickness limitations) but a high efficiency factor (70–80%); i.e., this facility will not cause a huge electricity bill and will ensure high productivity. In addition, the ELV is small in size, saving you the costs of construction of a separate room for the machine.
If you need to irradiate items that are more than 10 cm thick, you need an ILU. Due to the high energy (5–10 MeV), the electrons released by this accelerator penetrate deeper into the substance, which is why ILUs can be used to sterilize objects. In addition, the high energy of these accelerators allows one to convert the electron beam into bremsstrahlung gamma radiation.