What are accelerated electrons capable of?
In the middle of the 20th century, radiation technologies gradually began to enter our lives. Wires and cables of electronic devices and machines, medical equipment, cosmetics, polyethylene and even food products are already being irradiated at accelerators. How do these mysterious installations work? Why have they become an integral part of modern industrial production? And what contribution to the development of accelerator physics did the Budker Institute of Nuclear Physics make?
APPLICATION
Electron accelerators and we
How do industrial accelerators make our lives better?
This method increases the shelf life of products. It is convenient because the products are processed in packages, and the procedure itself is simple and fast. Cold pasteurization is safe and meets the highest standards, as it eliminates the use of harmful chemical preservatives. That is why the products processed by this method are clean and safe, compared to other methods.
Another area of use of the accelerators of ELV – treatment of waste water. They were used in the liquidation of the ecological disaster in Voronezh (more than 30 years ago), when the waste of the production of "Voronezhsintezkauchuk" got into the city water intake, as well as in the wastewater treatment of textile production in the city of Daegu in South Korea. These are the only examples in the world of using accelerators as full-scale installations for environmental purposes.


When exposed to ionizing radiation, some of the microorganisms perish and the others lose the ability to reproduce. The sterility assurance level after irradiation complies with modern medical standards (SAL 10-6); i.e., there is one or less nonsterile unit in one million products.

Radiation treatment of food products
Wastewater treatment
· Cables for submersible pumps
· Power wires and cables
· Cables for outside house and street wiring
· Cables for wind power generators.

Irradiation of wires and cables
to improve their properties
Sterilization of medical
devices
Irradiation of polyethylene tape
Production of polyethylene foam
Preparation of nanopowders
Advantages of radiation treatment:

  • Breaking strength increases by 20–40%;
  • Impact breaking strength increases up to 200%.

Polyethylene foam is an elastic material with properties such as:
  • excellent thermal insulation
  • protection against moisture and steam
  • airtightness
  • noise insulation
  • soft and light weight
  • rot resistance and durability
  • ecological safety
Under irradiation, a 3–5% aqueous solution of polyethylene oxide forms a hydrogel, which serves as a basis for medicinal compounds, cosmetics, and burn and wound dressings and provides an intermediate medium in ultrasound diagnostics.
Nanopowders are obtained by evaporation from melts. They are used as feedstock materials in the production of ceramic and composite materials, superconductors, solar panels, filters, getters, additives for lubricants, coloring and magnetic pigments, and components of low-temperature high-strength solders.
Manufacture of hydrogel
theory
How do accelerators work?
Major features of accelerator's working in Q&A format
What is a charged particle accelerator?
This is a facility that accelerates charged particles to very high energies. This device enables the generation of beams of primary charged particles as well as secondary ones (e.g., photons, neutrons, etc.), i.e., those that originate from collisions of a primary particle beam with a substance.

Accelerators have an important function to help scientists to explore properties of the elementary patricles, which is of great importance in nuclear physics and solid state physics. However, there are enough specialists from the other areas like chemists, biologists and geologists who are interested in particle accelaration. Besides, accelerators are now being applied in such applications like medicine, metallurgy and food industry.
For example, penetrating into a substance, the electron causes it to ionize; i.e., one particle forms about 10,000 lower-energy particles, which begin breaking old chemical bonds and making new ones.
How can we accelerate a particle?
For a particle to move faster, two "instruments" must be in place: an electric field and a magnetic field. The electric field is capable of changing the particle's energy while the magnetic one sets it into the right direction without affecting the particle's other properties. In other words, if we wish to accelerate a particle, we should put it into an electromagnetic field. However, to obtain higher-energy particles, we need field generators of greater power capability and a sufficient expanse for the acceleration.
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The energy of nuclear particles is measured in electronvolt (eV). Accelerators allow energy to be obtained in the range from thousands to several trillion (1012) eV.
What kinds of accelerators exist?
Several parameters exist to classify accelerators. Based on the particle path, they are divided into cyclic and linear. Based on the type of the accelerating field, they are classified into resonant and nonresonant. Resonant ones accelerate particles by means of a high-frequency alternating electromagnetic field; the particles accelerate by moving in resonance with the polarity alternations so as to constantly overcome the potential difference (it is this process that creates acceleration). In nonresonant accelerators, the field direction does not change.

Moreover, accelerators can be classified by the type of accelerated particles, by beam continuity, by the prevailing field (magnetic or electric), and by other properties.
In linear accelerators, in contrast to cyclic ones, particles pass through the accelerating structure only once. To achieve the right speed, the particles are initially boosted to a certain speed and set in a straight path. A large acceleration gradient can boost particles to very high energies although they pass though the accelerating portion of their trajectory only once.
How are linear accelerators different from the rest?
There are different types of linear accelerators: high-voltage, induction, and resonant. The INP specializes in manufacturing ILU-type linear resonant accelerators and high-voltage rectifiers of the ELV series.
First of all, linear accelerators have a relatively small size—there is no need in cumbersome magnetic systems. Moreover, they provide an easy release of the beam and high density of the current.

The INP accelerators have a simple design. Because of that, they are reliable and have no need in accurate stabilization of the thermal regime; i.e., they can begin to irradiate without long preheating. In addition, these facilities require relatively inexpensive supplies.
What are their advantages?
history
Acceleration through time
How were industrial linear accelerators developed at the Budker Institute of Nuclear Physics?
1928
1928
Rolf Wideröe
norwegian physicist
Creates a linear high-frequency particle accelerator
1929
1929
Robert Van de Graaff
american physicist
He is developing an electrostatic generator for a voltage of 80 kV, and two years later he created a generator with a capacity of 1 MV
1931
1931
John Cockcroft and Ernest Walton
english physicists
Build a cascade high voltage generator with a capacity of 700 kV
1933
1933
Robert Van de Graaff
american physicist
Creates a third electrostatic generator for a voltage of 7 MV
1940
1940
USSR
Russian scientists begin to study the effect of radiation processing on food
1954
1954
Company "Ethycon"
division of the American company "Johnson & Johnson"
The company uses electron accelerators to sterilize medical products
1960
1960
Linear electron accelerators begin to be used in factories for the production of wires and cables
1961-1963
1961-1963
USSR
Russia is closing the gap in the development and manufacturing of industrial electron accelerators. Scientists at the institute are developing direct-acting high-voltage accelerators of the transformer type. The All-Union Research Institute of Cable Industry confirms the high efficiency of the electron beam modification of polymer insulation for wires and cable blanks
1963
1963
Gersh Budker
USSR scientist, founder and director of Budker Institute of Nuclear Physics
At the initiative of the INP, work begins on the creation of industrial accelerators
1970
1970
The Ministry of Electrical Industry requests the INP to establish production of accelerators for work at cable enterprises of the industry
1970
1970
High-voltage rectifier serves as a basis for the development of the ELV, a new accelerator model
1970-1975
1970-1975
In the 1970s, the INP began to develop high-frequency industrial accelerators of the ILU typ
1977
1977
The INP has an operating ILU-6 accelerator with a movable stage to transport products in the processing zone. The facility can also work in the bremsstrahlung generation mode.

It is the ILU-6 that enables scientists to develop radiation technologies, from the irradiation of cables to the sterilization of medical items and synthesis of new medicinal products

1998
1998
Scientists at the INP work on an ILU-10 accelerator with an energy of up to 5 MeV and a beam power of up to 50 kW. For Russia, it is this accelerator that marks the beginning of the use of radiation technology to sterilize and process food
2010
2010
The institute develops the latest model of the ILU-14 high-frequency accelerators with an energy of up to 10 MeV and a beam power of up to 100 kW
2019
2019
The 180th ELV accelerator was handed over to the customer
In the early 1960s, Gersh I. Budker launched at the Institute of Nuclear Physics, which now bears his name, the development of high-power industrial accelerators. In the early years, these facilities had an energy of 1–1.5 MeV and an electron beam power of 10 kW, which was considered good characteristics.
Penetrating radiation offers an enormous potential for practical applications. The ability of particles to power through any obstacles, even those several meters thick, finds usage in introscopy. The ability of high-energy particles to excite and destroy molecules of matter, leading to the formation of new materials, lies at the core of radiation chemistry. The deadly effects of radiation on bacteria can be used to disinfect grains, sterilize medicines, preserve food, and disinfect wastewater.
Gersh Itskovich Budker
founder and first director of INP
1969
At first, the INP developed direct-acting high-voltage accelerators of the transformer type. In 1970, after confirming the efficiency of the electron–beam modification of polymer wire insulation, the USSR Ministry of Electrotechnical Industry placed a big order with the INP for—they ordered 15 accelerators at once—but they moved the goalposts: they demanded a higher electron beam power and a more reliable and maintainable facility, which should also be easy to operate. After receiving the order, the INP decided that instead of improving the old transformer-type machines (ELTs), they should develop new ones based on the high-voltage rectifier. This model of accelerators was called the ELV.
In the 1970s, the INP began to develop high-frequency industrial accelerators of the ILU type (pulse linear accelerators), which were originally intended to serve as preinjectors for the INP accelerator complexes.

The first one was the ILU-6 with a maximum beam power of up to 20–40 kW and an energy range of 1.5–2.5 MeV. These parameters allowed for a thicker insulation of the products being processed. Previously, the maximum energy of direct-acting accelerators did not exceed 1.5 MeV, and their power remained at 1–3 kW.

In the 1990s, the INP designed the ILU-10 accelerator with an energy of up to 5 MeV and a beam power of up to 50 kW. It generally reproduced the design of the ILU-6 accelerator, with the only difference that the ILU-10 resonator had a greater height and incorporated two high-frequency generators.

The growing market for disposable medical items and the increasing use of electron accelerators for food processing created a demand for accelerators with energies up to 10 MeV and a beam power of tens and hundreds of kW.

Calculations and work experience showed that a single-resonator system was inefficient in terms of energy at above 5 MeV due to an increase in resonator losses, which are proportional to the squared voltage. Therefore, to achieve higher energies, one should install several resonators consecutively and accelerate the beam electrons in several accelerating gaps. It is this scheme that was implemented at the INP. The new facilities were numbered 12 and 14 and had an energy range of 5.0–7.5 MeV and 7.5–10.0 MeV and a beam power of up to 60 kW and up to 100 kW, respectively.

structure
What is the difference between ELV and ILU?
Click on the dot to find out what the accelerator element is called


Principle of operation



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.).



Industrial properties



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.

Parameters of the latest models of ELV series accelerators
Parameters of the latest models of ILU type accelerators
distribution
Accelerators on the world market
Click on the dot to see how many INP accelerators are installed in different countries
Russia - 52 accelerators
Kazakhstan - 4 accelerators
China - 91 accelerators
India - 5 accelerators
Republic of Singapore - 1 accelerator
Kuala Lumpur - 1 accelerator
Philippines - 1 accelerator
Uzbekistan - 1 accelerator
Republic of Korea - 20 accelerators
Ukraine - 12 accelerators
Belarus - 6 accelerators
Turkey - 1 accelerator
Bulgaria - 1 accelerator
Poland - 4 accelerators
Germany - 2 accelerators
Czech Republic - 1 accelerator
Japan - 2 accelerators
USA - 1 accelerator
This production is a very expensive equipment designed for long service exploitation. For a year in the world 10-15 similar devices made in our Institute are acquired. Several manufacturers are fighting for this market, even China is now trying to establish its production. But their accelerators often lose to ours on a number of parameters, including reliability, so our Institute is unlikely to remain without orders. Today we have already produced and delivered to various countries almost 180 ELV series accelerators and more than 50 ILU type accelerators, most of them are still in exploitation, –
Nikolai Konstantinovich Kuksanov
doctor of technical sciences, chief researcher of INP









Laboratory staff № 14,
working with ILU type accelerators
Head of Department — candidate of technical sciences Bryazgin Alexander Albertovich
Laboratory staff № 12
working with accelerators of ELV-series
Head of Department — candidate of technical sciences Fadeev Sergey Nikolaevich
Left
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The Institute of Nuclear Physics of the Siberian Branch of the Russian Academy of Science
+7 (383) 329-47-60
+7 (383) 329-40-00

http://www.inp.nsk.su
inp@inp.nsk.su
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