Numerical simulation of multibeam systems by EL&ION code
Based on the tube method, taking into account the three second law for the current in each tube, the program EL&ION for preliminary rapid numerical analysis of the electron-optical system was developed, using which the system was developed for generating an ion beam of reactive gases with an ene...
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| Cite this: | Numerical simulation of multibeam systems by EL&ION code / P.A. Martynenko // Problems of atomic science and tecnology. — 2020. — № 3. — С. 92-93. — Бібліогр.: 12 назв. — англ. |
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Martynenko, P.A. 2023-11-27T12:18:30Z 2023-11-27T12:18:30Z 2020 Numerical simulation of multibeam systems by EL&ION code / P.A. Martynenko // Problems of atomic science and tecnology. — 2020. — № 3. — С. 92-93. — Бібліогр.: 12 назв. — англ. 1562-6016 PACS: 29.25.Ni https://nasplib.isofts.kiev.ua/handle/123456789/194534 Based on the tube method, taking into account the three second law for the current in each tube, the program EL&ION for preliminary rapid numerical analysis of the electron-optical system was developed, using which the system was developed for generating an ion beam of reactive gases with an energy of up to 50 keV and a current of 10…20 mA in the presence of high-density electron beam. На основі методу трубок з урахуванням закону трьох других для струму в кожній трубці розроблена програма EL-ІON попереднього швидкого чисельного аналізу електронно-оптичної системи, за допомогою якої була розрахована система формування пучка іонів реакційно-здатних газів з енергією до 50 кеВ і струмом 10…20 мА при наявності електронного пучка з високою густиною. На основе метода трубок с учетом закона трех вторых для тока в каждой трубке разработана программа EL-ION предварительного быстрого численного анализа электронно-оптической системы, с помощью которой была рассчитана система формирования пучка ионов реакционно-способных газов с энергией до 50 кэВ и током 10…20 мА при наличии высокоплотного электронного пучка. en Національний науковий центр «Харківський фізико-технічний інститут» НАН України Вопросы атомной науки и техники Beam dynamics Numerical simulation of multibeam systems by EL&ION code Чисельне моделювання багатопучкових систем за допомогою EL&ION-коду Численное моделирование многопучковых систем с помощью EL&ION-кода Article published earlier |
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Numerical simulation of multibeam systems by EL&ION code |
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Numerical simulation of multibeam systems by EL&ION code Martynenko, P.A. Beam dynamics |
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Numerical simulation of multibeam systems by EL&ION code |
| title_full |
Numerical simulation of multibeam systems by EL&ION code |
| title_fullStr |
Numerical simulation of multibeam systems by EL&ION code |
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Numerical simulation of multibeam systems by EL&ION code |
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numerical simulation of multibeam systems by el&ion code |
| author |
Martynenko, P.A. |
| author_facet |
Martynenko, P.A. |
| topic |
Beam dynamics |
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Beam dynamics |
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2020 |
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English |
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Вопросы атомной науки и техники |
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
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Чисельне моделювання багатопучкових систем за допомогою EL&ION-коду Численное моделирование многопучковых систем с помощью EL&ION-кода |
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Based on the tube method, taking into account the three second law for the current in each tube, the program EL&ION for preliminary rapid numerical analysis of the electron-optical system was developed, using which the system was developed for generating an ion beam of reactive gases with an energy of up to 50 keV and a current of 10…20 mA in the presence of high-density electron beam.
На основі методу трубок з урахуванням закону трьох других для струму в кожній трубці розроблена програма EL-ІON попереднього швидкого чисельного аналізу електронно-оптичної системи, за допомогою якої була розрахована система формування пучка іонів реакційно-здатних газів з енергією до 50 кеВ і струмом 10…20 мА при наявності електронного пучка з високою густиною.
На основе метода трубок с учетом закона трех вторых для тока в каждой трубке разработана программа EL-ION предварительного быстрого численного анализа электронно-оптической системы, с помощью которой была рассчитана система формирования пучка ионов реакционно-способных газов с энергией до 50 кэВ и током 10…20 мА при наличии высокоплотного электронного пучка.
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| issn |
1562-6016 |
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https://nasplib.isofts.kiev.ua/handle/123456789/194534 |
| citation_txt |
Numerical simulation of multibeam systems by EL&ION code / P.A. Martynenko // Problems of atomic science and tecnology. — 2020. — № 3. — С. 92-93. — Бібліогр.: 12 назв. — англ. |
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2025-11-24T03:05:51Z |
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| fulltext |
ISSN 1562-6016. ВАНТ. 2020. №3(127) 92
NUMERICAL SIMULATION OF MULTIBEAM SYSTEMS
BY EL&ION CODE
P.A. Martynenko
National Science Center “Kharkov Institute of Physics and Technology”, Kharkiv, Ukraine
E-mail: martynenkopetr91@gmail.com
Based on the tube method, taking into account the three second law for the current in each tube, the program
EL&ION for preliminary rapid numerical analysis of the electron-optical system was developed, using which the
system was developed for generating an ion beam of reactive gases with an energy of up to 50 keV and a current of
10...20 mA in the presence of high-density electron beam.
PACS: 29.25.Ni
INTRODUCTION
Beams of accelerated electrons and ions are widely
used in modern nuclear physics technologies. The de-
velopment of new systems for charged particles acceler-
ating, based on ideas proposed more than half a century
ago, continues to be relevant for the creation of new
electron and ion accelerators [1 - 3]. This work is de-
voted to the study of the possibility of numerically cal-
culating the formation system with a joint ion and high-
perveance electron beam (HPEB) used in the model of a
collective accelerator. The formation systems used for
the injector part of the accelerator consist of many elec-
trodes with complex configuration. Their choice is a
difficult task in optimizing the beam parameters [4, 5].
MULTIBEAM SYSTEM SIMULATION
The numerical calculation of the collective accelera-
tor injectors leads to the formation system creation of
the required parameter charged particle beams. The dif-
ficulty is the calculation of the self-consistent state [6]
of the joint flows of electrons and various types of ions
obtained from ion sources, both plasma type and solid-
state type [7].
The charged particle flows are modeled in an axi-
symmetric electrode system. The influence of the intrin-
sic magnetic field of the beams, ionization and secon-
dary emission processes is neglected in the calculations.
So as the computational time is reduced and it is possi-
ble to compare the calculation results with experimental
data both for a high-current electron injector and for a
thermal emitter of alkali metal ions. The ion and elec-
tron beam dynamics are calculated using the EL&ION
code, which implements the current tube method for
solving stationary self-consistent problems [8]. Using
this method allows to solve such problems more eco-
nomically in time, in contrast to the use of the particle in
cells method [9].
A rectangular uniform grid was used in the simula-
tion, with the number of cells 300100. The required
number of current tubes and the dimensions of the spa-
tial grid were selected from the condition of ensuring a
given accuracy in calculating the perveance of flows.
Thus the use of ~100 current tubes and 0.2 cm grid
spacing allows one to achieve the calculation accuracy
necessary for creating experimental samples of the high-
perveance charged particle guns.
An ion beam with energies up to 50 keV is injected
through an opening in the cathode of the electron gun.
The current of nitrogen ions can reach 30 mA [10]. Fig. 1
shows that the ions completely pass through the cathode
into the space behind the anode of the electron gun, which
is at zero potential and is connected to the drift tube.
Fig. 1. The charge density distribution and trajectories
of charged particles
RESULTS
The formation system calculation results of a con-
vergent tubular beam were used in the designing and
manufacturing of the electron gun for technological
purposes.
Fig. 2. The HPEB potential distribution and trajectories
of charged particles
The test results of the cathode assembly gun at a
power pulse amplitude of up to 100 kV showed no
breakdowns. The recorded amplitude current to the col-
lector isolated from the anode of the gun coincided with
the calculated value with good accuracy. The collector
current was recorded by an oscilloscope by the voltage
drop across the resistance of the collector grounding.
According to the results of the calculation of the forma-
tion system see Fig. 2, the location of the near cathode
equipotential for the design of the electron gun with a
control grid was determined. The experimental results
showed the possibility of 100% modulation of the beam
current at a frequency of less than 10 MHz without the
use of an external RF generator [11]. As can be seen
from Fig. 3, the presence of an ionic space charge in the
HPEB crossover compensates the Coulomb forces of
repulsion of electrons. Under conditions of ionic com-
pensation, the intrinsic magnetic field of a high-current
ISSN 1562-6016. ВАНТ. 2020. №3(127) 93
electron beam can significantly affect the motion of
electrons and ions in the space behind anode, which
leads to compression of the electron beam.
Fig. 3. The charge density distribution and trajectories
of HPEB
CONCLUSIONS
Experimental studies must be supplemented by nu-
merical calculations of the electron-optical system in the
presence of plasma near the axis, taking into account the
action of the magnetic field generated by the high-
current beam.
The first version of the EL&ION program was writ-
ten in the early 80's and was operated on a BESM-6
computer. In the early 90s, the program was adapted for
personal computers with operating systems such as MS-
DOS and WINDOWS. The program is connected to the
well-known library of graphic output programs Grafor
[12], adapted for computers using these systems. The
computational time is heavily dependent on the proces-
sor performance. The move to the 7th Generation Intel®
Core ™ i7 Processors reduces this time by more than 5
times compared with the system of the same architec-
ture, based on the Intel® Pentium® Processors. To
visualize the results, a script was written in Python3 that
implements the processing of data files using the mat-
plotlib 3.0.3 library. Graphing is performed in the re-
mote access operating mode on the server
https://colab.research.google.com.
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2. N.A. Khizhnyak, A.G. Lymar. Status of the
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V.I. Lyul'chenko, A.G. Lymar', P.A. Martynenko,
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Article received 29.01.2020
ЧИСЛЕННОЕ МОДЕЛИРОВАНИЕ МНОГОПУЧКОВЫХ СИСТЕМ С ПОМОЩЬЮ EL&ION-КОДА
П.A. Мартыненко
На основе метода трубок с учетом закона трех вторых для тока в каждой трубке разработана программа
EL-ION предварительного быстрого численного анализа электронно-оптической системы, с помощью кото-
рой была рассчитана система формирования пучка ионов реакционно-способных газов с энергией до 50 кэВ
и током 10…20 мА при наличии высокоплотного электронного пучка.
ЧИСЕЛЬНЕ МОДЕЛЮВАННЯ БАГАТОПУЧКОВИХ СИСТЕМ ЗА ДОПОМОГОЮ EL&ION-КОДУ
П.О. Мартиненко
На основі методу трубок з урахуванням закону трьох других для струму в кожній трубці розроблена про-
грама EL-ІON попереднього швидкого чисельного аналізу електронно-оптичної системи, за допомогою якої
була розрахована система формування пучка іонів реакційно-здатних газів з енергією до 50 кеВ і струмом
10...20 мА при наявності електронного пучка з високою густиною.
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