A method for maintaining the acceleration rate and increasing the energy of self-injected bunch due to the use of inhomogeneous plasma

The paper considers the process of excitation of a wakefield in a plasma by a laser pulse. The plasma density corresponds to the density of free electrons in the metal. A method is demonstrated for keeping self-injected bunch in the accelerating phase of the wakefield as laser pulse and bunch move i...

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Veröffentlicht in:Problems of Atomic Science and Technology
Datum:2023
Hauptverfasser: Bondar, D.S., Maslov, V.I., Onishchenko, I.N.
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Sprache:Englisch
Veröffentlicht: Національний науковий центр «Харківський фізико-технічний інститут» НАН України 2023
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author Bondar, D.S.
Maslov, V.I.
Onishchenko, I.N.
author_facet Bondar, D.S.
Maslov, V.I.
Onishchenko, I.N.
citation_txt A method for maintaining the acceleration rate and increasing the energy of self-injected bunch due to the use of inhomogeneous plasma / D.S. Bondar, V.I. Maslov, I.N. Onishchenko // Problems of Atomic Science and Technology. — 2023. — № 4. — С. 67-70. — Бібліогр.: 17 назв. — англ.
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container_title Problems of Atomic Science and Technology
description The paper considers the process of excitation of a wakefield in a plasma by a laser pulse. The plasma density corresponds to the density of free electrons in the metal. A method is demonstrated for keeping self-injected bunch in the accelerating phase of the wakefield as laser pulse and bunch move in plasma with an increasing density gradient. Thus, the rate of acceleration of self-injected bunch is maintained and enhanced. Розглянуто процес збудження кільватерного поля в плазмі лазерним імпульсом. Густина плазми відповідає густині вільних електронів у металі. Продемонстровано метод утримання самоінжектованого згусткa у фазі прискорення кільватерного поля, коли лазерний імпульс і згусток рухаються в плазмі зі зростаючим градієнтом щільності. Таким чином, темп прискорення самоінжектованого згусткa зберігається.
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fulltext ISSN 1562-6016. Problems of Atomic Science and Technology. 2023. № 4(146) 67 https://doi.org/10.46813/2023-146-067 A METHOD FOR MAINTAINING THE ACCELERATION RATE AND INCREASING THE ENERGY OF SELF-INJECTED BUNCH DUE TO THE USE OF INHOMOGENEOUS PLASMA D.S. Bondar 1,2 , V.I. Maslov 1,2 , I.N. Onishchenko 1 1 National Science Center “Kharkov Institute of Physics and Technology”, Kharkiv, Ukraine; 2 V.N. Karazin Kharkiv National University, Kharkiv, Ukraine E-mail: bondar.ds@yahoo.com The paper considers the process of excitation of a wakefield in a plasma by a laser pulse. The plasma density corresponds to the density of free electrons in the metal. A method is demonstrated for keeping self-injected bunch in the accelerating phase of the wakefield as laser pulse and bunch move in plasma with an increasing density gradi- ent. Thus, the rate of acceleration of self-injected bunch is maintained and enhanced. PACS: 29.17.+w; 41.75.Lx INTRODUCTION Wakefield acceleration has been a subject of intense research due to its potential to revolutionize particle acceleration technology. This method of particle accel- eration utilizes the electric fields generated in the wake of a driving pulse, typically a laser or a particle beam, propagating through a plasma [1 - 5]. The advantages of wakefield acceleration are numerous and have been explored in various contexts, including solid-state plas- mas and longitudinally inhomogeneous plasmas. One of the primary advantages of wakefield acceler- ation is its ability to achieve extremely high accelerating gradients, several orders of magnitude higher than those achievable with conventional accelerator technology. This high gradient allows for the production of high- energy particles over short distances, potentially leading to more compact and cost-effective accelerators [6 - 8]. In the context of solid-state plasmas, wakefield ac- celeration can be particularly advantageous. Solid-state plasmas are dense electron plasmas in solid-state mate- rials, such as metals, semiconductors etc. The high den- sity of these plasmas allows for the generation of strong wakefield and, consequently, high accelerating gradi- ents. Moreover, solid-state plasmas can be more easily manipulated and controlled than gaseous plasmas, al- lowing for more precise control over the acceleration process [9 - 11]. Wakefield acceleration in longitudinally inhomoge- neous plasmas also presents unique advantages. Longi- tudinal inhomogeneity refers to variations in the plasma density along the direction of propagation of the driving pulse. These variations can be exploited to enhance the efficiency of energy transfer from the driving pulse to the wakefield, thereby increasing the accelerating gradi- ent. Furthermore, by carefully designing the longitudi- nal density profile, it is possible to optimize the acceler- ation of particles [12, 13]. Wakefield acceleration in longitudinally inhomoge- neous plasmas also presents unique advantages. Longi- tudinal inhomogeneity refers to variations in the plasma density along the direction of propagation of the driving pulse. These variations can be exploited to enhance the efficiency of energy transfer from the driving pulse to the wakefield, thereby increasing the accelerating gradi- ent. Furthermore, by carefully designing the longitudi- nal density profile, it is possible to optimize the acceler- ation of particles [14 - 17]. In conclusion, wakefield acceleration offers a prom- ising avenue for advancing particle acceleration tech- nology. Its potential for achieving high accelerating gradients in a compact setup, coupled with its versatility and applicability in various contexts, makes it a compel- ling subject for further research and development. The excitation of the wakefield and the motion of bunch in an inhomogeneous plasma were studied. The motion of bunch was considered at the beginning of the simulation process, not far from the injection point. In particular, the fields acting on the bunch and the longi- tudinal momentum of the bunch are investigated. 1. STATEMENT OF THE PROBLEM With the help of numerical simulation, excitation by a laser pulse of a wakefield in a plasma is considered. The plasma density is considered, which is close to the density of free electrons in metals. Profiled pulse is con- sidered. Profiling is achieved by using “semi-cosine” pulse with a cosine intensity distribution ranging from 0 to π/2. The main parameters of the system were as follows: the plasma electron density (unperturbed), to which the density on the graph is normalized is n0e=10 23 cm -3 , the ratio of the plasma frequency to the laser frequency is ωpe/ω0=0.1008, where ω0 is the laser frequency, ωpe is the plasma frequency. The laser wavelength was λl=10.6 nm. All lengths, distances and coordinates were normalized to the laser wavelength λl. The laser pulse propagated along the axis of the system. The length of the simulation window was 800, the width 50. The laser amplitude a=EE0 -1 was normalized to the overturning field E0=mecω0(2πe) -1 . Force normalization, respective- ly, F0=mecω0/2π. The mass ratio of ions and electrons was 1836. Time was normalized to the period of the electromagnetic wave T0. A laser pulse with the follow- ing parameters is considered: amplitude a=5, half-length equal to 3, half-width at half-height equal to 4. The spa- tial dimensions are indicated for a cosine pulse, for a half-cosine pulse it is half as much. It is known that a self-injected bunch, moving along the wake bubble, enters the deceleration phase of the wake wave. The 68 ISSN 1562-6016. Problems of Atomic Science and Technology. 2023. № 4(146) process begins after the self-injected bunch reaches the middle of the wake bubble. This leads to the stop of the acceleration process and the loss of energy by the self- injected bunch. The main idea of inhomogeneity is that during the time until the self-injected bunch from the injection point reaches the middle of the wake bubble in homogeneous case, the plasma density will increase by 4 times. This will lead to a twofold decrease in the plasma wave length and, as a consequence, to stabiliza- tion of the position of the self-injected bunch in the re- gion of the accelerating phase of the wakefield. 2. RESULTS OF SIMULATION At first, let us consider how the bunch energy changes in the inhomogeneous case. The condition for the Cherenkov resonance of a laser pulse with a wake plasma wave: KVg=pe (1) or Vg=vph=pe/K, (2) K=2/; vph – wave vector and phase velocity of the Langmuir wave. Vg, , k – group velocity, frequency and wave vector of the laser pulse. =(pe 2 +c 2 k 2 ) 1/2 , (3) k=( 2 -pe 2 ) 1/2 /c . (4) From (3) it can be obtained: Vg=d/dk=c 2 k/(pe 2 +c 2 k 2 ) 1/2 =c 2 k/= =c(1-pe 2 / 2 ) 1/2 c(1-pe 2 /2 2 ). (5) From (2) it can be obtained: =2Vg/pe=2(c/pe)(1-pe 2 / 2 ) 1/2  2(c/pe)(1-pe 2 /2 2 ). (6) Both factors c/pe and (1-pe 2 /2 2 ) decrease  as ne(x) increases. But the 1 st multiplier reduces more. In order for the accelerated bunch to stay in the re- gion of the maximum accelerating field all the time, the bunch shear rate relative to the bubble Vb(t)-Vg(x) should be equal to the plasma wave length contraction rate d/dt. Vb(t)-Vg(x)=d/dt=(d/dz)(dz/dt), (7) dz/dt=Vg . In the ultrarelativistic bunch approximation Vbc. And neglecting the change in Vg in an inhomogeneous plasma, we obtain: c/Vg-1=d/dz. (8) At times (c-Vg)=/2 shift by (c-Vg)=/2 in the case of a homogeneous plasma and in the approximation that in an inhomogeneous plasma the bunch accelerates to Exmax and in the approximation that Ex is distributed Ex=Exmax(1-2x/) in the case of a homogeneous plasma the bunch accelerates to dεb/dt=eEv, (9) εb=ecExdx/(c-Vg)= =ecExmax(/4)(1-2x/) 2 /(c-Vg)0 /2 = =ecExmax(/4)/(c-Vg). (10) In an inhomogeneous plasma with a constant Exmax and with acceleration over an interval of almost 2 times greater, since it accelerates until the bubble almost completely collapses. εb=ecExmax(/2)2/(c-Vg)= =ecExmax/(c-Vg). (11) In the inhomogeneous case, the energy acquired by a self-injected bunch is theoretically 4 times higher than the energy in the homogeneous case. In fact in the in- homogeneous case the accelerating wakefield grows and the energy of accelerated electrons increases even more. Let us perform numerical simulation to verify the effi- ciency of using inhomogeneous plasma. Obviously, when simulating a real case, taking into account all factors, including the nonlinearity and loca- tion of the bunch relative to the accelerating phase of the wake wave, we will observe a smaller value of the energy increase but, nevertheless, an increase in energy will be observed. Fig. 1 shows a graph of the density during the pro- cess of excitation of the wakefield in the plasma by a laser pulse. The pattern of simulation in the homogene- ous and inhomogeneous cases is the same. One can ob- serve a self-injected bunch, which has just formed and begins its movement along the wake bubble (t=60T0). Fig. 1. Plasma electron density distribution ne(x, y) and longitudinal accelerating field Ex(x), t=60T0. Semi-cosine distribution of laser pulse both in the homogeneous and inhomogeneous case Fig. 2 characterizes the simulation pattern in the homogeneous case at the moment when the self-injected bunch approaches the point when the accelerating wake- field Ex=0. Comparison of Figs. 2 and 3, homogeneous and in- homogeneous cases at the same time points, indicates that due to the use of longitudinally inhomogeneous plasma, it is possible to keep the self-injected bunch in the acceleration phase, almost at the injection point. Fig. 2. Plasma electron density distribution ne(x, y) and longitudinal accelerating field Ex(x), t=140T0. Semi-cosine distribution in the homogeneous case ISSN 1562-6016. Problems of Atomic Science and Technology. 2023. № 4(146) 69 At the same time, when the self-injected bunch hits zero field in the homogeneous case, and later in the de- celeration phase of the wake wave. Fig. 3. Plasma electron density distribution ne(x, y) and longitudinal accelerating field Ex(x), t=140T0. Semi-cosine distribution in the inhomogeneous case Fig. 4 shows the case of a full cosine laser intensity distribution (non-profiled case). Obviously, the ad- vantage of using profiling, due to which stabilization of bunches is observed, their transverse expansion is re- duced. Fig. 4. Plasma electron density distribution ne(x, y) and longitudinal accelerating field Ex(x), t=140T0. Full-cosine distribution in the homogeneous case Fig. 5 shows the distribution of the longitudinal component of the pulse of a self-injected bunch simul- taneously in the homogeneous and inhomogeneous cas- es, when the effect of inhomogeneity is not yet felt in the case of a half-cosine laser. A stable bunch can be observed, but small momentum values. Comparing Figs. 5 and 6, we can conclude that in the inhomogeneous case, when the self-injected bunch reaches the middle of the wake bubble, there is an in- crease in the longitudinal momentum by a factor of 2.2 if we compare the bunch momenta at moments t=60T0 and t=140T0. The average momentum in the main re- gion of the bunch was taken as the momentum based on the graphic dependences. It has been studied that the increase in energy in the inhomogeneous case as com- pared to the homogeneous case reaches 3. In the homo- geneous case, due to the motion of the self-injected bunch along the wake bubble, at the moment 140 the longitudinal field in the bunch region in normalized units reaches approximately 0.0354. In the inhomoge- neous case, due to the confinement of the bunch near the injection point, at the same time in the bunch region, the value of the longitudinal acceleration field is 0.2681. Thus, an increase in the bunch acceleration field by a factor of approximately 7.6 is observed due to the use of plasma inhomogeneity. Fig. 5. Distribution of the longitudinal component of the momentum Px(x, y) in the electrons of a self- injected bunch, t=60T0. Semi-cosine distribution both in the homogeneous and inhomogeneous case Fig. 6. Distribution of the longitudinal component of the momentum Px(x, y) in the electrons of a self- injected bunch, t=140T0. Semi-cosine distribution both in the inhomogeneous case In the case of a semi-cosine intensity distribution, when the plasma is inhomogeneous, at time t=140T0, the formation of self-injected bunches with a minimum spatial distribution in the transverse direction is ob- served. This contrasts with the homogeneous case of an unshaped laser pulse. In this case, the decay of the self- injected bunch into 3 parts is observed, the transverse size of the bunch is much larger than the bunch in the case when the driver is semi-cosine and the plasma is inhomogeneous. CONCLUSIONS In the course of the study, the use of inhomogeneous plasma was considered in the study of self-injected bunches, which were formed when the wake field was excited by a profiled laser pulse. It was shown that the use of profiled pulse and in- homogeneous plasma has a positive effect on the quality of self-injected bunch and leads to the retention of 70 ISSN 1562-6016. Problems of Atomic Science and Technology. 2023. № 4(146) bunch in the acceleration field, which contributes to an increase in the energy gain and an increase in the longi- tudinal acceleration field in the bunch region. In addition, the advantage of using shaped pulse in an inhomogeneous case is the increased longitudinal momentum of the bunch, which provides more efficient acceleration. ACKNOWLEDGEMENTS This work is supported by National Research Founda- tion of Ukraine “Leading and Young Scientists Re- search Support”, grant agreement № 2020.02/0299. REFERENCES 1. E. Esarey, C.B. Schroeder, W.P. Leemans. Physics of laser-driven plasma-based electron accelerators // Rev. Mod. Phys. 2009, v. 81, p. 1229. doi:10.1103/ RevModPhys.81.1229. 2. V.I. Maslov, D.S. Bondar, I.N. Onishchenko. Inves- tigation of the Way of Phase Synchronization of a Self-Injected Bunch and an Accelerating Wakefield in Solid-State Plasma // Photonics. 2022, v. 9, p. 174. doi:10.3390/photonics9030174. 3. K.V. Galaydych, G.V. Sotnikov, I.N. Onishchenko. Theory of wakefields excited by an off-axis drive bunch in a plasma-dielectric waveguide // Nuclear Instruments and Methods in Physics Research Sec- tion A: Accelerators, Spectrometers, Detectors and Associated Equipment. 2022, v. 1034, p. 166766. doi:10.1016/j.nima.2022.166766. 4. M. Litos et al. 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Mangles, C. Murphy, Z. Najmudin, et al. Mo- noenergetic beams of relativistic electrons from in- tense laser-plasma interactions // Nature. 2004, v. 431, p. 535-538. doi:10.1038/nature02939. 17. E. Adli, A. Ahuja, O. Apsimon, et al. Acceleration of electrons in the plasma wakefield of a proton bunch // Nature. 2018, v. 561, p. 363-367. doi:10.1038/s41586-018-0485-4. Article received 29.07.2023 СПОСІБ ПІДТРИМАННЯ ТЕМПУ ПРИСКОРЕННЯ ТА ЗБІЛЬШЕННЯ ЕНЕРГІЇ САМОІНЖЕКТОВАНОГО ЗГУСТКA ШЛЯХОМ ВИКОРИСТАННЯ НЕОДНОРІДНОЇ ПЛАЗМИ Д.С. Бондар, В.І. Маслов, І.М. Оніщенко Розглянуто процес збудження кільватерного поля в плазмі лазерним імпульсом. Густина плазми відпові- дає густині вільних електронів у металі. Продемонстровано метод утримання самоінжектованого згусткa у фазі прискорення кільватерного поля, коли лазерний імпульс і згусток рухаються в плазмі зі зростаючим градієнтом щільності. Таким чином, темп прискорення самоінжектованого згусткa зберігається.
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institution Digital Library of Periodicals of National Academy of Sciences of Ukraine
issn 1562-6016
language English
last_indexed 2025-12-07T18:13:39Z
publishDate 2023
publisher Національний науковий центр «Харківський фізико-технічний інститут» НАН України
record_format dspace
spelling Bondar, D.S.
Maslov, V.I.
Onishchenko, I.N.
2023-12-11T11:52:11Z
2023-12-11T11:52:11Z
2023
A method for maintaining the acceleration rate and increasing the energy of self-injected bunch due to the use of inhomogeneous plasma / D.S. Bondar, V.I. Maslov, I.N. Onishchenko // Problems of Atomic Science and Technology. — 2023. — № 4. — С. 67-70. — Бібліогр.: 17 назв. — англ.
1562-6016
PACS: 29.17.+w; 41.75.Lx
DOI: https://doi.org/10.46813/2023-146-067
https://nasplib.isofts.kiev.ua/handle/123456789/196176
The paper considers the process of excitation of a wakefield in a plasma by a laser pulse. The plasma density corresponds to the density of free electrons in the metal. A method is demonstrated for keeping self-injected bunch in the accelerating phase of the wakefield as laser pulse and bunch move in plasma with an increasing density gradient. Thus, the rate of acceleration of self-injected bunch is maintained and enhanced.
Розглянуто процес збудження кільватерного поля в плазмі лазерним імпульсом. Густина плазми відповідає густині вільних електронів у металі. Продемонстровано метод утримання самоінжектованого згусткa у фазі прискорення кільватерного поля, коли лазерний імпульс і згусток рухаються в плазмі зі зростаючим градієнтом щільності. Таким чином, темп прискорення самоінжектованого згусткa зберігається.
This work is supported by National Research Foundation of Ukraine “Leading and Young Scientists Research Support”, grant agreement № 2020.02/0299.
en
Національний науковий центр «Харківський фізико-технічний інститут» НАН України
Problems of Atomic Science and Technology
New methods of charged particles acceleration
A method for maintaining the acceleration rate and increasing the energy of self-injected bunch due to the use of inhomogeneous plasma
Спосіб підтримання темпу прискорення та збільшення енергії самоінжектованого згусткa шляхом використання неоднорідної плазми
Article
published earlier
spellingShingle A method for maintaining the acceleration rate and increasing the energy of self-injected bunch due to the use of inhomogeneous plasma
Bondar, D.S.
Maslov, V.I.
Onishchenko, I.N.
New methods of charged particles acceleration
title A method for maintaining the acceleration rate and increasing the energy of self-injected bunch due to the use of inhomogeneous plasma
title_alt Спосіб підтримання темпу прискорення та збільшення енергії самоінжектованого згусткa шляхом використання неоднорідної плазми
title_full A method for maintaining the acceleration rate and increasing the energy of self-injected bunch due to the use of inhomogeneous plasma
title_fullStr A method for maintaining the acceleration rate and increasing the energy of self-injected bunch due to the use of inhomogeneous plasma
title_full_unstemmed A method for maintaining the acceleration rate and increasing the energy of self-injected bunch due to the use of inhomogeneous plasma
title_short A method for maintaining the acceleration rate and increasing the energy of self-injected bunch due to the use of inhomogeneous plasma
title_sort method for maintaining the acceleration rate and increasing the energy of self-injected bunch due to the use of inhomogeneous plasma
topic New methods of charged particles acceleration
topic_facet New methods of charged particles acceleration
url https://nasplib.isofts.kiev.ua/handle/123456789/196176
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