Accelerating of the electrons of electron bunches in a waveguide loaded dielectric structure
The paper presents some results of experimental studies of the excitation of wake fields and the acceleration of electrons in waveguide-dielectric structures (DS) upon injection of a sequence of electron bunches into them. Experiments have shown an increase in the amplitude of the wake wave and the...
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| Опубліковано в: : | Вопросы атомной науки и техники |
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України
2021
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Accelerating of the electrons of electron bunches in a waveguide loaded dielectric structure / A.F. Linnik, I.N. Onishchenko, O.L. Omelayenko, V.I. Pristupa, G.V. Sotnikov, V.S. Us // Problems of Atomic Science and Technology. — 2021. — № 6. — С. 67-71. — Бібліогр.: 20 назв. — англ. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1859675076623859712 |
|---|---|
| author | Linnik, A.F. Onishchenko, I.N. Omelayenko, O.L. Pristupa, V.I. Sotnikov, G.V. Us, V.S. |
| author_facet | Linnik, A.F. Onishchenko, I.N. Omelayenko, O.L. Pristupa, V.I. Sotnikov, G.V. Us, V.S. |
| citation_txt | Accelerating of the electrons of electron bunches in a waveguide loaded dielectric structure / A.F. Linnik, I.N. Onishchenko, O.L. Omelayenko, V.I. Pristupa, G.V. Sotnikov, V.S. Us // Problems of Atomic Science and Technology. — 2021. — № 6. — С. 67-71. — Бібліогр.: 20 назв. — англ. |
| collection | DSpace DC |
| container_title | Вопросы атомной науки и техники |
| description | The paper presents some results of experimental studies of the excitation of wake fields and the acceleration of electrons in waveguide-dielectric structures (DS) upon injection of a sequence of electron bunches into them. Experiments have shown an increase in the amplitude of the wake wave and the acceleration of a small fraction of electrons when the wavelength of the excited field is equal to the doubled bunch length. A simple physical model of the observed phenomenon is given. Also, the paper proposes a method for accelerating a part of each electron bunch in the steady-state mode of the resonator dielectric structure. Some of the electrons are “cut out” by the collimator and enter the accelerating phase of the previously excited wake wave. The wave is displaced due to the difference in the distances traveled by the wave and the accelerated part of the electrons.
Представлені деякі результати експериментальних досліджень збудження кільватерних полів і прискорення електронів в хвилеводно-діелектричних структурах при інжекції в них послідовності електронних згустків. Експерименти показали збільшення амплітуди кільватерної хвилі і прискорення невеликої частини електронів при рівності довжини хвилі збуджуваного поля подвоєній довжині згустку. Дана проста фізична модель цього явища. Також у роботі запропоновано спосіб прискорення частини кожного електронного згустку в сталому режимі резонаторної діелектричної структури. Частина електронів «вирізується» коліматором і потрапляє в прискорюючу фазу збудженої раніше кільватерну хвилю. Хвиля зміщується за рахунок різниці в відстанях, що проходять хвиля і прискорювана частина електронів.
Представлены некоторые результаты экспериментальных исследований возбуждения кильватерных полей и ускорения электронов в волноводно-диэлектрических структурах при инжекции в них последовательности электронных сгустков. Эксперименты показали увеличение амплитуды кильватерной волны и ускорение небольшой части электронов при равенстве длины волны возбужденного поля удвоенной длине сгустка. Дана простая физическая модель наблюдаемого явления. Также в работе предложен способ ускорения части каждого электронного сгустка в установившемся режиме резонаторной диэлектрической структуры. Часть электронов «вырезается» коллиматором и попадает в ускоряющую фазу возбужденной ранее кильватерной волны. Волна смещается за счет разницы в расстояниях, проходимых волной и ускоряемой частью электронов.
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| first_indexed | 2025-11-30T15:40:18Z |
| format | Article |
| fulltext |
ISSN 1562-6016. ВАНТ. 2021. № 6(136) 67
https://doi.org/10.46813/2021-136-067
ACCELERATING OF THE ELECTRONS OF ELECTRON BUNCHES
IN A WAVEGUIDE LOADED DIELECTRIC STRUCTURE
A.F. Linnik, I.N. Onishchenko, O.L. Omelayenko, V.I. Pristupa, G.V. Sotnikov, V.S. Us
National Science Center “Kharkov Institute of Physics and Technology”, Kharkiv, Ukraine
E-mail: aflinnik@kipt.kharkov.ua
The paper presents some results of experimental studies of the excitation of wake fields and the acceleration of
electrons in waveguide-dielectric structures (DS) upon injection of a sequence of electron bunches into them. Exper-
iments have shown an increase in the amplitude of the wake wave and the acceleration of a small fraction of elec-
trons when the wavelength of the excited field is equal to the doubled bunch length. A simple physical model of the
observed phenomenon is given. Also, the paper proposes a method for accelerating a part of each electron bunch in
the steady-state mode of the resonator dielectric structure. Some of the electrons are “cut out” by the collimator and
enter the accelerating phase of the previously excited wake wave. The wave is displaced due to the difference in the
distances traveled by the wave and the accelerated part of the electrons.
PACS: 41.75.Lx; 52.40.Mj
INTRODUCTION
A new method of accelerating charged particles, which
is based on the use of a wake field arising behind an
electron bunch or a sequence of bunches passing
through a waveguide-dielectric structure (DS), is cur-
rently being actively studied theoretically and experi-
mentally [1 - 3].
The main element of the DS is a cylindrical or rec-
tangular copper waveguide filled inside with a dielectric
with a vacuum channel along the axis. In the traditional
wakefield acceleration scheme, a short electron bunch
with a large charge (up to 100 nC), when flying in a
vacuum channel, generates the wake mode of Cheren-
kov radiation. Following it with a delay of ~ λ/2, where
λ is the wavelength of the excited mode, a bunch with
high energy but low charge is accelerated in this field.
Experiments at SLAC [4] have shown that the accelerat-
ing field in the dielectric channel can reach
1.5…2 GV/m.
But traditional schemes of wake acceleration in DS
are technically complex. And one of the main difficul-
ties is the creation and precise injection of the accelerat-
ed bunch into the accelerating phase of the wake wave.
In our opinion, this problem slows down the develop-
ment of the wake acceleration method.
Earlier, in [5], the possibility of additional accelera-
tion in the resonator structure of a linear accelerator of
individual bunches of relativistic electrons was experi-
mentally shown. This requires deflecting fields of the
nanosecond range of duration and large amplitude.
In [6], it was proposed to use a phase shifter to
change the phase of the wave in the resonator by π radi-
ans, which will lead, in the steady state, to the entry of
electron bunches into the accelerating phase of the
wave. However, the proposal was not implemented due
to the technical impossibility of changing the phase at
the required speed.
This paper presents some results of experimental
studies of the excitation of wake fields and the accelera-
tion of electrons in DSs of circular and rectangular cross
sections. The wake fields in the DS were excited by a
regular sequence of relativistic electron bunches.
An increase in the amplitude of that harmonic was
observed, the wavelength of which is equal to the dou-
bled bunch length. Analysis of the position of the bunch
in the field of this harmonic showed the possibility of
accelerating a small part of the electrons located at its
trailing edge of the bunch, simultaneously in the accel-
erating and focusing phases of the wake wave. Acceler-
ated electrons were observed experimentally in DSs of
circular and rectangular cross sections. A simple physi-
cal model of the increase in the amplitude of this har-
monic is given.
The paper also considers a method for accelerating
electrons by a wake field in passive DSs.
The essence of the proposed acceleration method lies
in the fact that after passing through a certain part of the
DS, and the excitation of a wake wave in it, the paths of
the wave and electron bunches diverge. The electron
bunches continue to move straight, but the number of
electrons in the bunches decreases significantly as they
pass through small holes in the walls of the waveguides.
The “cut off” electrons enter the second part of the DS
while continuing to move straight. The wake wave, on
the other hand, enters the second part of the DS passing
a longer path. The path length of the wake wave is long-
er than the path of electrons by half the waveguide
wavelength.
1. PARAMETERS OF ELECTRONS
BUNCHES INJECTED INTO DS
In experiments on accelerating a part of electrons of
bunches, we used the "Almaz-2" accelerator with an
electron energy of 3…4.5 MeV. The beam consists of a
sequence of 6000 electron bunches with a pulse duration
of 2 µs and a bunch repetition period. Т ≈ 360 ps. The
charge of each bunch is q = 0.1…0.16 nC (Ib ≤ 3 А).
A characteristic feature of the accelerator is the abil-
ity to change the width of its energy spectrum (the ener-
gy distribution function of electrons in bunches) with a
slight change in the operating frequency of the accelera-
tor. The phase size of the bunches, measured in the mid-
dle of the operating frequency range using passive reso-
nators [7], is shown in Fig. 1.
ISSN 1562-6016. ВАНТ. 2021. № 6(136) 68
Fig. 1. Average phase size of the bunch
According to [7] 80% of electron bunches occupy a
phase volume of about 20°.
The phase size of bunches for accelerators similar to
"Almaz-2" was also measured using high-frequency
separators in [8, 9], the phase "half-width" is 32°. About
90% of electrons have a phase size of ~ 50° (bunch
length ~ 1.6 cm. The effect of the width of the energy
spectrum of bunches on the length of bunches is ob-
served. The accelerator and the interaction region are
located at some distance from each other. Between them
there is an energy analyzer, a pumping unit, etc. (there is
a drift zone). At our electron energies and energy spec-
trum width, it is necessary to take into account the ex-
pansion of bunches due to the difference in speed of
particles with nominal energy and particles with mini-
mum and maximum energy.
The possibility of changing the width of the energy
spectrum and the duration of electron bunches expands
the range of experimental studies.
2. EXCITATION OF A WAKEFIELDS IN A DS
The excitation of a wakefield by a sequence of elec-
tron bunches in a DS with a circular and rectangular
cross-section was studied earlier [10 - 12].
In 0.1 µs, after the start of injection of a sequence of
electron bunches into the resonator DS (injection time of
the first 300 bunches), the increase in the amplitude of
the longitudinal component of the wake field stops and a
steady state of field excitation sets in.
The experiments were carried out in the resonator
mode of the DS operation. [3, 10]. For this, a cap with a
titanium foil 50 μm thick, transparent for relativistic
electrons, was installed at the exit of the structure.
With the exception of electron bunches, no other
particles or fields were injected into the DS during the
experiments. Therefore, the structure can be considered
passive. In this case, the acceleration of some part of the
electrons, due to the redistribution of energy between
the particles, can be considered self acceleration.
Fig. 2. Longitudinal component of the wake field
In the steady state, using a pin probe, the amplitude
and distribution of the longitudinal component of the field
strength were measured. Studies have shown that oscilla-
tions of the E01 type with a wavelength of 11.25 cm (at
the repetition rate of the bunches) and E03 with a wave-
length of 3.56 cm (at three times the repetition rate of the
bunches) have the highest amplitude. Fig. 2 shows the
signal obtained by moving the probe along the axis of the
resonator behind the dielectric insert curve 1. The iso-
lated signal of the first harmonic is shown in curve 2.
Studies using a cone transition and an out-of-limit, for
the first mode, waveguide confirmed the presence and
significant amplitude of the third harmonic.
The experiment was carried out with a DS of a circu-
lar cross section. A fluoroplastic sleeve 45 cm long was
used as a dielectric; its outer diameter was 2b = 8.6 cm,
the hole on the DS axis had a diameter of 2a = 2.2 cm.
The structure was tightly inserted into a circular wave-
guide 100 cm long. The width of the energy spectrum of
the beam was δW ~ 12%, the calculated length of the
bunch is ℓbu ~ 1.8 cm. (The length of the bunch is close
to half the waveguide wavelength of the third harmon-
ic).
Earlier, in work [13], it was shown that in a dielec-
tric resonator the amplitude of the wake wave will be
maximum if its wavelength is equal to the doubled
length of the electron bunches that excite this field.
When a sequence of electron bunches were injected into
the plasma formed by the bunches themselves upon their
injection into a neutral gas [14], the predominant excita-
tion of a harmonic with a wavelength equal to twice the
bunch length was also observed.
This amplification of one of the harmonics does not
correspond to the traditional frequency response (ampli-
tude-frequency characteristic) built for a sequence of
bunches with a duty cycle of Q = 6.
However, there is a mechanism for increasing the
amplitude for harmonics, which depends on the duration
of the bunches exciting the field.
3. DEPENDENCE OF THE DYNAMIC
FACTOR ON THE FORCE PULSE
DURATION
Dinamic factor(DF)-μ, with power excitation, is the
ratio of the amplitude of the forced vibrations to the
static amplitude [15].
As a rule, the DF is determined by the increase in the
amplitude of the forced vibrations of the system from
the frequency of the harmonic external force. In this
case, the DF depends only on the frequency ratio. But,
in our case, the Coulomb field excited by electron
bunches should be considered not harmonic oscillations
of the field strength; and individual field pulses with a
duration of τf = 60 ps and a period of 360 ps. Bunches
are injected into the DS, which is designed to excite
harmonics with a period of Тs equal to: 360 ps for the
first harmonic, 180 ps for the second harmonic, 120 ps
for the third, etc.
In the case of the action of short (in comparison with
the period of natural oscillations) impulses of force, the
DF depends on the ratio of the duration of the impulse
of the force to the period of natural oscillations [16, 17].
rad
ISSN 1562-6016. ВАНТ. 2021. № 6(136) 69
In Fig. 3 shows the dependence of the DF on τf / Тs. In
[18], a table is given for the values τf/Тs of the DF. The
DF begins to have a noticeable effect on the system at
τf / Тs> 0.15. This dependence will be valid when the
force impulse is rectangular.
Fig. 3. Dependence of the DF on the ratio
of the force pulse duration to the period of natural
oscillations
The increase in the DF is a response to each individ-
ual impulse of force. When they are repeated, the ampli-
tude of the forced oscillations also increases due to the
replication coefficient β [18]. This coefficient character-
izes the increase in the effect of repetitive impulses.
When the pulse repetition rates ωf coincide with the
natural frequency of the system ωs, or their multiplicity
(ωs = n ωf, where n = 1, 2 …), a resonance occurs.
The repetition factor is, as in the case of harmonic
oscillations, the requirement for the frequency of har-
monics to be the frequency of the external force.
In our experiments (at a distance between the exit of
the accelerator and the DS of ~ 20 cm), the period of the
third harmonic is equal to twice the length of the bunches
and, one could expect an increase of the DF by two times.
But, the value of the DF largely depends on the shape of
the force pulse and, the discrepancy between the shape of
the real pulse and the shape adopted in the calculation
leads to a decrease in the dynamic coefficient. In our case,
the amplitude of the third harmonic is increased by
~ 1.5 times.
Thus, if the system is acted upon by short impulses
of force (τf <Тs), then, in order to obtain the maximum
amplitude of oscillations, it is necessary that the dura-
tion of the impulse of the force be equal to half the peri-
od of the natural oscillations of the system, and the fre-
quency should be equal to or a multiple of the frequency
of impulses of the force ωs = nωf and ωs = π / τf or, for
the period Ts = Tf / n and Ts=2τf (1)
4. ACCELERATION OF A PART OF
ELECTRONS OF ELECTRONIC BUNCHES
The first and third harmonics have the highest ampli-
tudes in the DS, their superposition is observed, and the
interaction of these modes with bunches can be consid-
ered separately.
When the bunches of the third harmonic of the repe-
tition rate are excited, their length is equal to half the
won wavelength of the excited field, and in the steady
state mode, the "center of gravity" of the bunches should
be in the region of the field maximum in the decelerat-
ing phase of the wave, Fig. 4.
In this case, according to [19], the ratio between the
transverse and longitudinal components of the wake
field can be determined from: Er max / Ez max = (πa) / λ, for
the third harmonic the transverse and longitudinal com-
ponents of the wake field are close in magnitude.
Based on the position of the bunch in the wake
wave, it can be seen that some of the electrons at the
leading and trailing edges of the bunch are in the accel-
erating phase of the longitudinal field of the wave.
However, the electrons at the leading edge are also sim-
ultaneously in the defocusing phase of the transverse
component of the field and should rather quickly leave
the beam region. The trailing edge electrons are simul-
taneously in the accelerating and focusing phases of the
wake wave and can receive additional acceleration and
focus. The wake wave and bunches, in the considered
part of the DS, move in the same direction. This, in our
opinion, is the mechanism for the acceleration of a small
number of electrons observed experimentally.
Fig. 4. Position of the bunch in the decelerating phase
of the wake wave
The bunch electrons are in different phases of the
longitudinal and transverse fields. This leads to a change
in the shape of the clot its "sharpening". The possibil-
ity of changing the shape of bunches upon excitation of
wake fields was theoretically shown in [20]. Experimen-
tally, the change in the shape of the bunches and the
appearance of accelerated electrons were observed both
in a DS with a rectangular cross section [eleven]. The
change in the shape of the bunches is more clearly ob-
served in the DS with a circular cross section.
In Fig. 5 shows imprints on glass plates of bunches
deployed in a transverse magnetic field in the absence
(1) and presence (2) of a dielectric insert in the wave-
guide. The dimensions of the DS were the same as in
Section 2. Accelerated electrons were observed at the
"tip" of the leading front of bunches.
1 2
Fig. 5. Imprints on glass plates of clumps deployed
in a transverse magnetic field in the absence (1)
and presence (2) of a dielectric insert
The influence of the field of the first harmonic on
the motion of bunches is not decisive. In the steady-state
regime, the field of the first harmonic cannot lead to the
simultaneous acceleration and focusing of any part of
the bunch.
Based on (1), in order to increase the amplitude of
the wake field excited by the bunches and the possible
acceleration of a certain number of electrons, the DS
should meet the following requirements: The wave-
ISSN 1562-6016. ВАНТ. 2021. № 6(136) 70
length of the first harmonic of the DS should be a multi-
ple of the bunch repetition rate and close to twice the
bunch length (for example, take ℓb ~ 1.5 cm). We find
the dimensions of the dielectric insert using the expres-
sion for the excited modes from [18]:
λn = 4 (b - a) / n; for (ε - 1) ~ 1.
The wave of 3 cm is considered as the main one, is
taken equal to 2.1. The thickness of the dielectric insert
in this case should be 0.7 cm, and with a channel radius
of 1 cm, the outer radius of the insert is 1.7 cm, the same
inner radius of the waveguide in which the dielectric
structure is placed. The critical wavelength for E01 in a
waveguide with a dielectric insert is λcd ~ 6.5 cm. The
waveguide wavelength is λvd ~ 2.65 cm. It is rational to
make the structure 21.2 cm long.
5. SCHEMES OF DS FOR ACCELERATION
OF PART OF ELECTRONS OF CLUSTERS
WITH A DELAY MODE
For a more reliable and controlled acceleration of a
part of electrons in bunches, one can use the DS scheme
shown in Fig. 6.
Fig. 6. Schematic diagram of a DS
for accelerating a part of electrons in bunches:
smooth rotation of the waveguide (a);
rotation of the waveguide by 90° (b)
The DS is designed to accelerate a part of the elec-
trons of the bunches in two possible variants of the de-
lay of the wake wave relative to the accelerated part of
the electrons. The circuits are identical, with the excep-
tion of the wave delay unit and can be used for DSs of
both circular and rectangular cross sections.
The excitation of the wake wave and the position of
the bunches in the first part of the structure are de-
scribed in the previous section. After leaving the first
part of the DS, the paths of the wave and electron
bunches diverge. The electron bunches continue to
move straight, but the number of electrons in the bunch-
es decreases significantly as they pass through the holes
in the walls of the waveguides. The “cut off” electrons
enter the second part of the DS while continuing to
move straight. The wake wave enters the second part of
the DS passing a longer path. The outer and inner diam-
eters of the second part of the DS are the same as in its
first part a = 1 cm, b = 1.7 cm, but its length is shorter
than the length of the first part by the length of the delay
unit: ℓvf -le = 1.32; 4 or 6.6 cm. It is assumed that with
the radius of collimating holes ≈ 3…4 mm, the acceler-
ated bunches will have 10…15% of the charge of the
bunches located in the first part of the DS.
Thus, bunches with a small number of electrons fall
into the accelerating phase of the wake wave at the en-
trance to the second part of the DS, and can be acceler-
ated in it.
CONCLUSIONS
In this work, for the first time experimentally shown
the importance of taking into account the length of the
bunches in the excitation of wake fields in the DC. The
amplitude of the wakefield harmonic with a wavelength
equal to twice the length of the bunches increases when
a long sequence of bunches is used. In this case, a small
number of accelerated electrons were also observed. The
paper proposes a simple physical model of this phenom-
enon. It consists in the fact that the field excited by the
bunches must be considered as separate pulses, and not
as harmonic oscillations (Q = 6). In this case, the ampli-
tude of the harmonic increases, for which the period is
equal to twice the duration of the bunch. This, in turn,
causes the acceleration of some of the electrons located
at the trailing edge of the bunch, simultaneously in the
accelerating and focusing field of the wave.
Also shown is a diagram of the acceleration of a
part of the electrons of the bunches during the delay of
the wake wave, excited by the bunches earlier, relative
to the accelerated part of the electrons by half the wave-
length. But, unfortunately, in both cases the acceleration
is limited by the low phase velocity of the wave in the
DW. Therefore, further it is desirable to conduct studies
of the possibility of increasing the phase velocity of the
wave. In a round waveguide, for example, this can be
done by decreasing the radius of the waveguide. In this
case, the critical wavelength will decrease and an in-
crease in the phase velocity.
The study was supported by the program of the Na-
tional Academy of Sciences of Ukraine "Advanced Re-
search in Plasma Physics, Controlled Thermonuclear
Fusion and Plasma Technologies", project P-1/63-2020.
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Article received 11.10.2021
УСКОРЕНИЕ ЧАСТИ ЭЛЕКТРОНОВ ЭЛЕКТРОННЫХ СГУСТКОВ
В ДИЭЛЕКТРИЧЕСКОЙ СТРУКТУРЕ
А.Ф. Линник, И.Н. Онищенко, О.Л. Омелаенко, В.И. Приступа, Г.В. Сотников, В.С. Ус
Представлены некоторые результаты экспериментальных исследований возбуждения кильватерных по-
лей и ускорения электронов в волноводно-диэлектрических структурах при инжекции в них последователь-
ности электронных сгустков. Эксперименты показали увеличение амплитуды кильватерной волны и ускоре-
ние небольшой части электронов при равенстве длины волны возбужденного поля удвоенной длине сгустка.
Дана простая физическая модель наблюдаемого явления. Также в работе предложен способ ускорения части
каждого электронного сгустка в установившемся режиме резонаторной диэлектрической структуры. Часть
электронов «вырезается» коллиматором и попадает в ускоряющую фазу возбужденной ранее кильватерной
волны. Волна смещается за счет разницы в расстояниях, проходимых волной и ускоряемой частью электро-
нов.
ПРИСКОРЕННЯ ЧАСТИНИ ЕЛЕКТРОНІВ ЕЛЕКТРОННИХ ЗГУСТКІВ
У ДІЕЛЕКТРИЧНІЙ СТРУКТУРІ
А.Ф. Лінник, І.М. Оніщенко, О.Л. Омелаєнко, В.І. Приступа, Г.В. Сотніков, В.С. Ус
Представлені деякі результати експериментальних досліджень збудження кільватерних полів і приско-
рення електронів в хвилеводно-діелектричних структурах при інжекції в них послідовності електронних
згустків. Експерименти показали збільшення амплітуди кільватерної хвилі і прискорення невеликої частини
електронів при рівності довжини хвилі збуджуваного поля подвоєній довжині згустку. Дана проста фізична
модель цього явища. Також у роботі запропоновано спосіб прискорення частини кожного електронного згу-
стку в сталому режимі резонаторної діелектричної структури. Частина електронів «вирізується» колімато-
ром і потрапляє в прискорюючу фазу збудженої раніше кільватерну хвилю. Хвиля зміщується за рахунок
різниці в відстанях, що проходять хвиля і прискорювана частина електронів.
http://www.pdhonline.org/
|
| id | nasplib_isofts_kiev_ua-123456789-195639 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 1562-6016 |
| language | English |
| last_indexed | 2025-11-30T15:40:18Z |
| publishDate | 2021 |
| publisher | Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| record_format | dspace |
| spelling | Linnik, A.F. Onishchenko, I.N. Omelayenko, O.L. Pristupa, V.I. Sotnikov, G.V. Us, V.S. 2023-12-05T17:34:33Z 2023-12-05T17:34:33Z 2021 Accelerating of the electrons of electron bunches in a waveguide loaded dielectric structure / A.F. Linnik, I.N. Onishchenko, O.L. Omelayenko, V.I. Pristupa, G.V. Sotnikov, V.S. Us // Problems of Atomic Science and Technology. — 2021. — № 6. — С. 67-71. — Бібліогр.: 20 назв. — англ. 1562-6016 PACS: 41.75.Lx; 52.40.Mj DOI: https://doi.org/10.46813/2021-136-067 https://nasplib.isofts.kiev.ua/handle/123456789/195639 The paper presents some results of experimental studies of the excitation of wake fields and the acceleration of electrons in waveguide-dielectric structures (DS) upon injection of a sequence of electron bunches into them. Experiments have shown an increase in the amplitude of the wake wave and the acceleration of a small fraction of electrons when the wavelength of the excited field is equal to the doubled bunch length. A simple physical model of the observed phenomenon is given. Also, the paper proposes a method for accelerating a part of each electron bunch in the steady-state mode of the resonator dielectric structure. Some of the electrons are “cut out” by the collimator and enter the accelerating phase of the previously excited wake wave. The wave is displaced due to the difference in the distances traveled by the wave and the accelerated part of the electrons. Представлені деякі результати експериментальних досліджень збудження кільватерних полів і прискорення електронів в хвилеводно-діелектричних структурах при інжекції в них послідовності електронних згустків. Експерименти показали збільшення амплітуди кільватерної хвилі і прискорення невеликої частини електронів при рівності довжини хвилі збуджуваного поля подвоєній довжині згустку. Дана проста фізична модель цього явища. Також у роботі запропоновано спосіб прискорення частини кожного електронного згустку в сталому режимі резонаторної діелектричної структури. Частина електронів «вирізується» коліматором і потрапляє в прискорюючу фазу збудженої раніше кільватерну хвилю. Хвиля зміщується за рахунок різниці в відстанях, що проходять хвиля і прискорювана частина електронів. Представлены некоторые результаты экспериментальных исследований возбуждения кильватерных полей и ускорения электронов в волноводно-диэлектрических структурах при инжекции в них последовательности электронных сгустков. Эксперименты показали увеличение амплитуды кильватерной волны и ускорение небольшой части электронов при равенстве длины волны возбужденного поля удвоенной длине сгустка. Дана простая физическая модель наблюдаемого явления. Также в работе предложен способ ускорения части каждого электронного сгустка в установившемся режиме резонаторной диэлектрической структуры. Часть электронов «вырезается» коллиматором и попадает в ускоряющую фазу возбужденной ранее кильватерной волны. Волна смещается за счет разницы в расстояниях, проходимых волной и ускоряемой частью электронов. The study was supported by the program of the National Academy of Sciences of Ukraine "Advanced Research in Plasma Physics, Controlled Thermonuclear Fusion and Plasma Technologies", project P-1/63-2020. en Національний науковий центр «Харківський фізико-технічний інститут» НАН України Вопросы атомной науки и техники Novel and non-standard acceleration technologies Accelerating of the electrons of electron bunches in a waveguide loaded dielectric structure Прискорення частинок електронних згустків у діелектричній структурі Ускорение частиц электронных сгустков в диэлектрической структуре Article published earlier |
| spellingShingle | Accelerating of the electrons of electron bunches in a waveguide loaded dielectric structure Linnik, A.F. Onishchenko, I.N. Omelayenko, O.L. Pristupa, V.I. Sotnikov, G.V. Us, V.S. Novel and non-standard acceleration technologies |
| title | Accelerating of the electrons of electron bunches in a waveguide loaded dielectric structure |
| title_alt | Прискорення частинок електронних згустків у діелектричній структурі Ускорение частиц электронных сгустков в диэлектрической структуре |
| title_full | Accelerating of the electrons of electron bunches in a waveguide loaded dielectric structure |
| title_fullStr | Accelerating of the electrons of electron bunches in a waveguide loaded dielectric structure |
| title_full_unstemmed | Accelerating of the electrons of electron bunches in a waveguide loaded dielectric structure |
| title_short | Accelerating of the electrons of electron bunches in a waveguide loaded dielectric structure |
| title_sort | accelerating of the electrons of electron bunches in a waveguide loaded dielectric structure |
| topic | Novel and non-standard acceleration technologies |
| topic_facet | Novel and non-standard acceleration technologies |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/195639 |
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