PHYSICAL SCIENCES
THE USE OF NEW NANOSTRUCTURE METHODS ALLOWING TO INCREASE THE MONOCHROMATICITY OF THE BEAM DURING ACCELERATION
UDC 621
Rinat Fuadovich Rumi
Senior Researcher, Head of the Laboratory of Accelerator Technology at the Research Institute Physics of Semiconductors and Microelectronics at the National University of Uzbekistan
Laboratory of Accelerator Technology at the Research Institute Physics of Semiconductors and Microelectronics at the National University of Uzbekistan, Tashkent, Uzbekistan
Abstact. The development of accelerator technology has been actively observed after numerous works by Ernest Rutherford, from the discovery of the planetary model and the implementation of the first nuclear reaction to the present day. And it is worth noting that for each time there were quite interesting requirements for charged particle beams, among which the most popular requirement at almost all times was the beam energy, then its current can be noted, but one of the most important among them is the monochromaticity of the charged particle beam.
Keywords: monochromaticity, monoenergetics, charged particle beam, accelerator, nanostructures.
Аннотация. Развитие ускорительной техники наблюдалось активно после многочисленных работ Эрнеста Резерфорда, от открытия планетарной модели и осуществления первой ядерной реакции до сегодняшний дней. И стоит отметить, что для каждого времени существовали довольно интересные требования к пучкам заряженных частиц, среди коих самым популярным требованием почти во все времена являлась энергия пучка, затем можно отметить его ток, но одним из важных среди них является монохромотичность пучка заряженных частиц.
Ключевые слова: монохроматичность, моноэнергетичность, пучок заряженных частиц, ускоритель, наноструктуры.
Introduction
Initially, it is necessary to give a general concept of the monochromaticity parameter itself, which is often associated with monoenergetics. The whole point is that the beam, after its formation by thermionic, auto- or other emission, has a heterogeneity in energy, which is why the particles in its various regions have different, albeit slightly distinguishable energies. With acceleration, their given spread or gradient increases, although it becomes smoother. For example, on accelerators of the 80s, an example of which is the SOKOL-2 accelerator, monoenergetics of up to 5 keV is achieved at 2 MeV of the total beam energy, while on modern accelerators, at an energy of 20 MeV, an accuracy of up to 1 keV is achieved in maximum accuracy.
Problems
If the question arises about the figure of this value, then it is thanks to it that we can talk about the effectiveness of the entire reaction, because as far as the energies in the beam are homogeneous and have a value close to each other, so much more of them will be close to the energy desired for this reaction channel to the necessary resonance, which will make the reaction more efficient.
Today, exo-energetic nuclear reactions are known, the output particles in which have more energy than at the input, but at the same time such a reaction takes place only for a part of the particles due to the very smallness of the total monoenergetics of the beam.
Solving the problem
To achieve results, that is, to increase the efficiency of the conducted nuclear reaction, it is necessary to increase monoenergetics, and for this it is necessary to develop a method for equalizing energy on different parts of the beam. As is known, in a magnetic field, under the influence of the Lorentz force (12), particles are deflected, while the beam at the maximum energy in its center and decreasing closer to the edges is stratified, passing into a kind of energy gradient.
Further, it is more likely that the beam will be divided into component parts, where the losses will be much less than it would be with beam selection with losses of more than 90%, namely, for divisions, the losses will be only 12%. Nanotubes, in themselves, are formations resembling carbon tubes that transmit a charge, but at the same time separated from each other by a dielectric layer of molecules.
For the formation of a charge in such a system, a vertical and horizontal transmission line is carried out to each tube, with the closure of which this particular cell is charged. When a second system of the same type is located opposite, a potential difference arises between them, thanks to which it is possible to give energy in the gradient spectrum, the reverse of the incoming beam gradient, while losing only 12% of the total number of charges, and, accordingly, current.
At the same time, it is important to note that although it is not so difficult to vary the potential differences within the framework of a modern 1 keV accelerator, but the accuracy is not infinite. While maintaining the same voltage ratio for 20 MeV, an accuracy of up to 0.040.05 eV can be achieved, which is a shocking result.
But this technology is currently being developed in a theoretical matter and is not without disadvantages, for example, such a system is suitable for fairly small beams with currents of 1 nA and only in very rare cases up to 1 µA, but it is possible to find a solution with the creation of sets of such small beams divisible in the future, but this stage is the beginning a new study that further increases the efficiency of accelerator technology and possibly, with the implementation of this technology on the charged particle accelerator of the Electron project, it will become possible to name this accelerator having the highest monoenergetics of the beam, and, accordingly, the highest efficiency of all nuclear reactions carried out on it.
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