Radiation complex on the basis of helium ions linac
The numerical simulation results and experimental investigation of helium ions linear accelerator with output
 energy 4 MeV and focusing by an RF field are presented. The variant of alternating-phase focusing with a step
 change in the synchronous phase and increasing amplitude of th...
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України
2018
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| Cite this: | Radiation complex on the basis of helium ions linac / S.N. Dubniuk, R.A. Anokhin, A.F. Dyachenko, А.P. Коbets, A.I. Kravchenko, O.V. Manuilenko, К.V. Pavlii, V.N. Reshetnikov, A.S. Shevchenko, V.A. Soshenkо, S.S. Tishkin, B.V. Zajtsev, A.V. Zhuravlyov, V.G. Zhuravlyov // Вопросы атомной науки и техники. — 2018. — № 4. — С. 46-51. — Бібліогр.: 29 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1860011859659194368 |
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| author | Dubniuk, S.N. Anokhin, R.A. Dyachenko, A.F. Коbets, А.P. Kravchenko, A.I. Manuilenko, O.V Pavlii, К.V. Reshetnikov, V.N. Shevchenko, A.S. Soshenkо, V.A. Tishkin, S.S. Zajtsev, B.V. Zhuravlyov, A.V. Zhuravlyov, V.G. |
| author_facet | Dubniuk, S.N. Anokhin, R.A. Dyachenko, A.F. Коbets, А.P. Kravchenko, A.I. Manuilenko, O.V Pavlii, К.V. Reshetnikov, V.N. Shevchenko, A.S. Soshenkо, V.A. Tishkin, S.S. Zajtsev, B.V. Zhuravlyov, A.V. Zhuravlyov, V.G. |
| citation_txt | Radiation complex on the basis of helium ions linac / S.N. Dubniuk, R.A. Anokhin, A.F. Dyachenko, А.P. Коbets, A.I. Kravchenko, O.V. Manuilenko, К.V. Pavlii, V.N. Reshetnikov, A.S. Shevchenko, V.A. Soshenkо, S.S. Tishkin, B.V. Zajtsev, A.V. Zhuravlyov, V.G. Zhuravlyov // Вопросы атомной науки и техники. — 2018. — № 4. — С. 46-51. — Бібліогр.: 29 назв. — англ. |
| collection | DSpace DC |
| container_title | Вопросы атомной науки и техники |
| description | The numerical simulation results and experimental investigation of helium ions linear accelerator with output
energy 4 MeV and focusing by an RF field are presented. The variant of alternating-phase focusing with a step
change in the synchronous phase and increasing amplitude of the RF field in accelerating gaps in the grouping section of the accelerating-focusing tract of the accelerator is used to ensure the radial-phase stability of the accelerated
beam. The methods for increasing the accelerated ion beam current, as well as the beam current density on the target, are considered.
Представлено результати чисельного та експериментального дослідження лінійного прискорювача іонів
гелію з вихідною енергією 4 МеВ і фокусуванням ВЧ-полем. Для забезпечення радіально-фазової стійкості
прискореного пучка використано варіант змінно-фазового фокусування з покроковою зміною синхронної
фази і наростаючою амплітудою ВЧ-поля в прискорюючих зазорах на групуючій ділянці прискорюючофокусуючого тракту прискорювача. Розглянуто способи збільшення струму прискореного пучка іонів, а також щільності струму пучка на мішені.
Приведены результаты численного моделирования и экспериментального исследования линейного ускорителя ионов гелия с выходной энергией 4 МэВ c фокусировкой ВЧ-полем. Для обеспечения радиальнофазовой устойчивости ускоряемого пучка использован вариант переменно-фазовой фокусировки с шаговым
изменением синхронной фазы и нарастающей амплитудой ВЧ-поля в ускоряющих зазорах на группирующем участке ускоряюще-фокусирующего тракта ускорителя. Рассмотрены способы увеличения тока ускоряемого пучка ионов, а также плотности тока пучка на мишени.
|
| first_indexed | 2025-12-07T16:42:24Z |
| format | Article |
| fulltext |
ISSN 1562-6016. ВАНТ. 2018. №4(116) 46
RADIATION COMPLEX ON THE BASIS OF HELIUM IONS LINAC
S.N. Dubniuk*, R.A. Anokhin, A.F. Dyachenko, А.P. Коbets, A.I. Kravchenko,
O.V. Manuilenko, К.V. Pavlii, V.N. Reshetnikov, A.S. Shevchenko, V.A. Soshenkо,
S.S. Tishkin, B.V. Zajtsev, A.V. Zhuravlyov, V.G. Zhuravlyov
National Science Center “Kharkov Institute of Physics and Technology”, Kharkov, Ukraine
*E-mail: sergdubnyuk@gmail.com
The numerical simulation results and experimental investigation of helium ions linear accelerator with output
energy 4 MeV and focusing by an RF field are presented. The variant of alternating-phase focusing with a step
change in the synchronous phase and increasing amplitude of the RF field in accelerating gaps in the grouping sec-
tion of the accelerating-focusing tract of the accelerator is used to ensure the radial-phase stability of the accelerated
beam. The methods for increasing the accelerated ion beam current, as well as the beam current density on the tar-
get, are considered.
PACS: 29.17.w, 29.27.Bd
INTRODUCTION
Ion beams are widely used in science and industry:
from high-energy and nuclear physics, plasma physics
with magnetic and inertial confinement fusion, material
science and medicine to ion beam-assisted deposition,
implantation and track membranes production [1 - 10].
The critical issue in fusion reactors design, as well
as nuclear power plants, is the influence of radiation on
structural materials [11 - 14]. The irradiation of struc-
tural materials on ion accelerators makes it possible to
study their behavior faster than in experimental nuclear
reactors due to higher damage degree.
To study the structural materials behavior under the
action of ionizing radiation, a radiation complex based
on a helium ions linac was constructed. The radiation
complex consists of the helium ions linear accelerator,
the beam transporting and focusing system on a sample,
the irradiation chamber for samples, the systems for in-
situ measuring and controlling irradiation parameters in
experiments.
The main elements of the ions linear accelerator are
an injector (Fig. 1) and a resonator with an accelerating
structure, placed in a vacuum chamber (Fig. 2). A spe-
cial feature of the accelerator is the use of an alternat-
ing-phase focusing with a step-by-step change in the
synchronous phase and an increasing amplitude of the
RF field in accelerating gaps on the grouping part of the
accelerating-focusing tract [15 - 17]. The linac injection
energy and injection current are 120 keV and up to
10 mA, respectively, output energy is 4 MeV, and out-
put current is 1 mA. Fig. 3 shows the beam transporting
and focusing line from the output of the accelerating
section to the irradiation chamber with samples.
Fig. 1. Injector of the helium ions linac
with an output energy of 120 keV
The paper present the injector, the accelerating
structure and the beam transporting and focusing line on
the target, as well as the results of numerical and exper-
imental studies of beam dynamics in the accelerator and
in the transport line in order to increase the beam cur-
rent at the accelerator output and the beam current den-
sity on the target.
Fig. 2. Helium ions linac with an output energy
of 4 MeV (foreground). Main section
of the multicharged ions linac (background)
Fig. 3. Transport line for the helium ions beam.
Left to right: irradiation chamber with samples,
focusing triplet, output of the accelerator
1. HELIUM IONS INJECTOR
Helium ions injector was developed on the basis of a
proton source to obtain helium ions with an energy of
30 keV/nucl. at the input of accelerator (Fig. 4) [18].
When a voltage pulse is applied to the anode, the
discharge is ignited between the filament cathode (1)
and the intermediate electrode (2). The plasma is drawn
out to the anode (3) and anticathode (4) through the
channel in the intermediate electrode. Magnetic fields of
ISSN 1562-6016. ВАНТ. 2018. №4(116) 47
the electromagnet (5) and the auxiliary coils (6) com-
presse plasma in the region between the intermediate
electrode and the anticathode and increases the plasma
density. Electrons oscillate in the potential well between
the intermediate electrode and the anticathode, ionizing
the neutral gas fed through the tube (9) into the cathode
discharge region. The cathode part of the source, the
intermediate electrode and the anode are cooled by wa-
ter (7, 8, 10).
4321567
8
9
10
Fig. 4. Helium ions source
Fig. 5 shows the helium ions injector.
123456
7 8
Fig. 5. Helium ions injector
It consists of an ion source (see Fig. 4) and a system
of electrodes for extraction, focusing and acceleration a
helium ions beam to energy of 120 keV. The voltage of
120 kV from the high-voltage modulator is supplied to
the water based divider and distributed over the elec-
trode system. The extraction (1) and focusing (2) elec-
trodes are housed in a caprolon case (8). These elec-
trodes are used for ions extraction from the plasma, and
for beam formation, which is further accelerated by the
accelerating tube (electrodes 3-6).
Between the accelerating tube electrodes there are
ceramic rings (7) with a developed lateral surface,
which withstand a potential difference up to 80 kV. This
suppresses high-voltage breakdowns along the lateral
surface. The stabilized supply voltage of the high-
voltage modulator makes it possible to obtain at the
accelerator input a helium ions beam with an energy up
to 130 keV, up to 20 mA current and a minimum energy
spread, which ensures an acceptable capture of the beam
by the accelerating structure. The main parameters of
the injector are given in Table 1.
Table 1
The main injector parameters
Working gas helium
Arc current, А 2…6
Beam current at the output, mA up to 20
Beam energy at the output, keV up to 130
Beam diameter at the output, mm ~ 14
Working gas pressure in the source
anode region, mmHg 5∙10-3
Frequency of pulses, Hz 2…5
Arc modulator pulse width, μs 500
Magnetic field in source, oersted 300…1000
High-voltage modulator pulse width, μs 500
2. HELIUM IONS LINAC ACCELERATING
STRUCTURE
When developing a helium ions linac, it was neces-
sary to use existing production areas, existing equip-
ment and technological infrastructure. At present, most
linear accelerators in the range of small and medium
energies are constructed according to the following
scheme: (1) an ion source with an output energy of
50…120 keV, (2) a beam transport and matching sys-
tem with the RFQ structure input, (3) an accelerating
structure with RFQ, energy range 0.1…3 MeV, (4)
structure with drift tubes and focusing elements ar-
ranged in them in the form of electromagnetic or solid
quadrupole lenses.
Computer simulation has shown that in our case this
approach is unacceptable. The acceleration rate in struc-
tures with RFQ is low, which leads to a significant
elongation and the inability to place the structure in the
available areas. Decreasing the length of the accelerat-
ing section by combining RFQ and the structure with
drift tubes with electromagnetic lenses is difficult to
realize because of the low particles velocity and the
short drift tubes in which quadrupole lenses are to be
placed.
An alternative option to ensure radial and longitudi-
nal stability of the particle beam motion during accel-
eration is alternative-phase focusing (APF) [19]. In the
APF, simultaneous radial and phase stability of the
beam is achieved due to alternation of regions with neg-
ative and positive values of the synchronous phase. In
this case, the longitudinal and transverse forces acting
on the particle are of an alternating nature. Under cer-
tain conditions in such a system, it is possible to provide
simultaneous longitudinal and phase stability of the par-
ticles beam motion during the acceleration process. The
number of accelerating gaps in the focusing period can
be different. With increasing particle energy, the total
number of gaps entering the focusing period increases.
This is due to the fact that focusing (or defocusing with
a negative value of the synchronous phase) properties of
the gap decrease in proportion to the particles velocity.
ISSN 1562-6016. ВАНТ. 2018. №4(116) 48
Therefore, in the APF the concept of "focusing period"
is not entirely correct, since there is no periodicity. For
each subsequent energy interval, we have to design our
own "focusing period". The task is complicated by the
fact that the focusing periods must be consistent with
each other, taking into account the essential nonlinearity
of particle dynamics. The nonlinearity of the particles
dynamics in the APF is related not only to the nonline-
arity of the Coulomb repulsion forces, but also to the
connection of longitudinal and transverse motion. Par-
ticularly difficult for numerical simulation is the initial
section of the accelerating-focusing channel with APF,
on this site, in addition to the particles acceleration,
there is the task of forming a bunch. In addition, the
space charge forces in the accelerator initial part render
the maximum influence on the beam dynamics.
Taking into account the foregoing, in order to ensure
the required acceleration rate, with the maximum value
of the particles capture coefficient in the acceleration
regime, the number of accelerating-focusing periods, the
phase distribution of the synchronous particle, and the
magnitude of the RF field amplitude in the gaps are
chosen as follows (Table 2):
Table 2
The linac accelerating-focusing channel structure
Period The synchronous
phase, degrees
Electric field,
kV/cm
1 -90; 75; 60; 0; -60 27.5…37.5
2 -90; 75; 60; 0; -50 40…50
3 -85; 75; 60; 0; -65 52.5…62.5
4 -70; 75; 60; 0; -60 65…75
5 -70; 75; 60; 0; -60 75
6 -90; 75; 60; 40; 0; -60 75
7 -60 32.5
Table 2 shows that the accelerator consists of 6 fo-
cusing periods and one phasing accelerating gap. Each
focusing period contains accelerating gaps with large
absolute values of the synchronous phase, which ensure
maximum capture of particles in the acceleration mode,
and a gap with a zero synchronous phase, which has the
maximum acceleration rate. To compensate for the de-
crease in the rigidity of focusing with increasing particle
energy, acceleration gaps with an increasing amplitude
of the rf field are used in the grouping region. The
grouping section consists of four focusing periods,
where the amplitude of the RF field increases from 27.5
to 75 kV/cm, by 2.5 kV/cm at each gap.
The accelerating channel calculation, taking into ac-
count the electrodes real configuration and the space
charge forces, was carried out using the code APFRFQ
[20]. Table 3 shows the main parameters.
The coefficient of beam capture into the acceleration
mode is: for a beam current of 0 mA − 42%, for a beam
current of 20 mA − 40%, for a current of 30 mA − 30%,
which is not inferior to the accelerator [21] with APF, in
which, as an accelerating-grouping area uses a structure
with RFQ.
As an accelerating section for this channel, an H-
resonator with drift tubes is used. The drift tubes in the
resonator are fixed on its axis by means of rods, which
facilitates the formation of a π-wave of the electric field
along the accelerating section.
Table 3
Calculated parameters
of the accelerating-focusing channel
Operating frequency, MHz 47.2
Injection energy, keV/nucleon 30
Output energy, MeV/nucleon 0.975
Accelerating cells number 32
Overall length, cm 237.7
Electric field strength in accelerating
gaps, kV/cm
25…75
The maximum value of the electric field
strength at accelerating electrodes, kV/cm
170
Aperture radius, cm 0.75…1.5
Input transverse beam emittance,
mm∙mrad
0.6
Accelerated current at injection current:
10 mA
20 mA
30 mA
4
8
10
The length of the accelerating period is equal to
βλ/2, where β = v/c (v is the velocity of helium ions, c is
the velocity of light, and λ is the wavelength of the elec-
tromagnetic field). In the considered region of the heli-
um ion velocities, the H structures have a maximum
shunt impedance (Rsh ≥ 50 MΩ/m), which allows to
significantly reduce the RF power. At the same time, the
diameter of the resonator decreases considerably (ap-
proximately 4 times as compared with the E-cavity),
which simplifies its manufacturing and placement in a
vacuum casing (Fig. 6). The tuning of the structure was
carried out by the methods given in [22 - 24].
Fig. 6. Resonator view after the final technological
assembly
Tuned acceleration section, manufactured according
to the results of numerical calculations, differed slightly
from the calculated one by its electrodynamic parame-
ters (resonance frequency, acceleration field distribution
along the structure gaps, Q-factor). Therefore, numeri-
cal simulation of the beam dynamics using the experi-
mentally obtained electrodynamic parameters of the
accelerating structure was carried out. The following
results were obtained: at the injection current 3 mA, the
accelerated current was 1 mA; at the injection current of
20…4.5 mA; at the injection current of 30…6 mA. Op-
timizing the operation of the injector, increasing the
injector beam current, falling into the accelerator chan-
nel acceptance, led to an increase in the helium ions
ISSN 1562-6016. ВАНТ. 2018. №4(116) 49
accelerated current from 0.3 mA (initially) to 1 mA
(now). Computer simulations show, the beam current
can be increased to 4…5 mA with better matching of
the beam emittance at the accelerator input and the ac-
celeration channel acceptance.
Since the beam radius at the accelerating structure
output is about 1.5 cm, it is possible to increase the
beam current density of accelerated helium ions directly
on the irradiating sample, using magnetic focusing at
beam transporting to the target.
3. BEAM TRANSPORTING LINE
The channel for focusing and transporting the heli-
um ion beam between the accelerating structure output
and the sample irradiation chamber is designed to create
the maximum current density of the accelerated beam
on the target. For this purpose, a quadrupole focusing
triplet is used with independent power supplies of the
electromagnetic quadrupole lenses included in its com-
position. The triplet makes it possible to change the
beam radius on the target, depending on the experi-
mental requirements. As the accelerating structure con-
structed on the basis of the APF has an axisymmetric
beam at the output, the most suitable is the use of a
symmetric triplet. A symmetrical triplet consists of three
electromagnetic quadrupole lenses with alternating fo-
cusing and defocusing actions. The first and last triplet
lenses are of the same length. The middle lens length is
the sum of the first and last lenses lengths. To calculate
the transport channel with a focusing triplet and the par-
ticles dynamics in it, the output beam characteristics of
the structure with APF were obtained using the
APFRFQ code (Fig. 7): beam energy 4 MeV, beam cur-
rent 4 mA, beam diameter 30 mm, the beam envelope
inclination angle is 0 mrad. As a result of calculation
and optimization of the triplet main parameters, the
transport channel geometry, the magnetic field gradients
magnitudes in the quadrupole lenses and the ions dy-
namics in the channel were obtained. The calculations
were done taking into account the available equipment
and the free space availability in the accelerator hall.
Fig. 8 shows beam envelopes and the transportation line
geometry. The numbers denote drift gaps: 1 − 347.5 mm,
3 − 75 mm, 5 − 70 mm, 7 − 297.5 mm; quadrupole mag-
netic lenses: 2 − 90 mm, 4 − 180 mm, 6 − 90 mm. The
magnetic field gradients in the magnetic lenses centers:
2 − 18 T/m, 4 − 15.7 T/m, 6 − 18 T/m.
Fig. 7. Calculated values of the helium ion beam
parameters at the accelerator output: transverse beam
emittance (left); transverse beam geometric dimensions
(right)
Fig. 8. Transport channel for the helium ion beam
between the output of the accelerating structure
and the sample irradiation chamber
Table 4 shows the measurements results of the mag-
netic field at various radial distances from the center for
the triplet shown in Fig. 3. It is clear that the required
magnetic field gradients at the magnetic lenses centers
18 and 15.7 T/m, can be obtained.
Table 4
Magnetic field vs current in the triplet lenses
Long lens
4.5 mm 12.5 mm 20.5 mm
І, А В, Т І, А В, Т І, А В, Т
1.0 0.012 1.0 0.043 1.0 0.077
2.0 0.022 2.0 0.083 2.0 0.148
3.0 0.032 3.0 0.123 3.0 0.215
4.0 0.043 4.0 0.158 4.0 0.283
5.0 0.049 5.0 0.188 5.0 0.337
6.0 0.055 6.0 0.209 6.0 0.375
6.4 0.057 6.55 0.217 6.55 0.389
Short lens
4.5 mm 12.5 mm 20.5 mm
І, А В, Т І, А В, Т І, А В, Т
1.0 0.016 1.0 0.043 1.0 0.062
2.0 0.028 2.0 0.079 2.0 0.124
3.0 0.04 3.0 0.114 3.0 0.186
4.0 0.051 4.0 0.142 4.0 0.239
5.0 0.058 5.0 0.163 5.0 0.277
6.0 0.064 6.0 0.179 6.0 0.302
7.0 0.068 7.0 0.192 7.0 0.325
8.0 0.072 8.0 0.202 8.0 0.342
9.0 0.075 9.0 0.210 9.0 0.356
10.0 0.078 10.0 0.218 10.0 0.369
10.35 0.079 10.1 0.218 10.7 0.378
The triplet is located between the output of the linac
and the chamber for irradiating the samples. Investiga-
tions of the triplet focusing properties for a helium ions
beam with an energy of 120 keV showed that if the cur-
rent at the input to the triplet is 1.5 mA and at the output
0.7 mA, then after its switching on and tuning (the
lenses currents are selected to obtain the maximum ion
beam current at the output), the output current is equal
to 1.25 mA. The ion beam current was measured with
the help of flight sensors located at the accelerating
structure output (in front of the triplet) and at the triplet
output. Experiments with the 4 MeV beam indicated
that a helium ions beam current (up to 0.8 mA) can be
focused on a target in a spot about 1 cm in diameter.
Fig. 9 shows the focusing system adjustment equip-
ment.
ISSN 1562-6016. ВАНТ. 2018. №4(116) 50
Fig. 9. The focusing system adjustment stand.
The display shows the image of the output beam
on the phosphor
CONCLUSIONS
The basic systems optimization of the helium ions
linac with an output energy 4 MeV made it possible to
increase the accelerated beam current up to 1 mA.
Computer simulation of the beam dynamics in the ac-
celerator performed for the experimentally obtained
distributions of the RF field amplitude along the accel-
erating structure, shows that the current of the accelerat-
ed helium ion beam can be increased to 4…5 mA. For
this, it is necessary to improve the matching of the beam
emittance at the accelerator input with the acceleration
channel acceptance.
The system for transporting and focusing the beam
on the target was calculated, fabricated and mounted. It
reduces beam losses during its transport to the target
and focuses the beam on the sample into a spot of diam-
eter about 1 cm. Experiments with a beam with an ener-
gy 120 keV showed that if the current at the input to the
triplet is 1.5 mA and at the output 0.7 mA, then after
switching on and setting the triplet, the current at its
output is 1.25 mA. Preliminary experiments with a
beam (an energy of 4 MeV) indicated that a helium ions
beam current (up to 0.8 mA) can be produced on the
target in a spot about 1 cm in diameter.
Numerical estimates made using the SRIM code, for
a beam of 4 MeV helium ions, a pulse current 780 μA, a
current pulse duration of 500 μs, a repetition rate of
5 pulses per sec and 1 cm in diameter on the target, for
tungsten give 0.25 dpa/hour, and for iron −
0.14 dpa/hour.
The helium ion accelerator (A/q = 4, ion energy at
the output of 0.975 MeV/nucl.) can be used as an injec-
tor for the multicharged ions accelerator main section
(A/q = 5, injection energy is 0.975 MeV/nucl., output
energy is 8.5 MeV/nucl., see Fig. 2). Currently, as an
injector for the multicharged ions accelerator main sec-
tion, an ion accelerator consisting of RFQ [25] and a
structure with combined high-frequency focusing [16,
26, 27] is also being developed. This will increase the
accelerated current to 10 mA, reduce the injection ener-
gy from 33 to 6 keV/nucl., expand the range of acceler-
ated ions to A/q ≤ 20, to carry out experimental studies
on the merger of heavy nuclei [28, 29].
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Article received 10.06.2018
РАДИАЦИОННЫЙ КОМПЛЕКС НА БАЗЕ ЛИНЕЙНОГО УСКОРИТЕЛЯ ИОНОВ ГЕЛИЯ
С.Н. Дубнюк, Р.А. Анохин, А.Ф. Дьяченко, А.Ф. Кобец, А.И. Кравченко, О.В. Мануйленко,
К.В. Павлий, В.Н. Решетников, А.С. Шевченко, В.А. Сошенко, С.С. Тишкин, Б.В. Зайцев,
А.В. Журавлев, В.Г. Журавлев
Приведены результаты численного моделирования и экспериментального исследования линейного уско-
рителя ионов гелия с выходной энергией 4 МэВ c фокусировкой ВЧ-полем. Для обеспечения радиально-
фазовой устойчивости ускоряемого пучка использован вариант переменно-фазовой фокусировки с шаговым
изменением синхронной фазы и нарастающей амплитудой ВЧ-поля в ускоряющих зазорах на группирую-
щем участке ускоряюще-фокусирующего тракта ускорителя. Рассмотрены способы увеличения тока ускоря-
емого пучка ионов, а также плотности тока пучка на мишени.
РАДІАЦІЙНИЙ КОМПЛЕКС НА БАЗІ ЛІНІЙНОГО ПРИСКОРЮВАЧА ІОНІВ ГЕЛІЮ
С.М. Дубнюк, Р.О. Анохін, О.Ф. Дьяченко, А.П. Кобець, А.І. Кравченко, О.В. Мануйленко,
К.В. Павлій, В.М. Решетніков, О.С. Шевченко, В.А. Сошенко, С.С. Тішкін, Б.В. Зайцев,
О.В. Журавльов, В.Г. Журавльов
Представлено результати чисельного та експериментального дослідження лінійного прискорювача іонів
гелію з вихідною енергією 4 МеВ і фокусуванням ВЧ-полем. Для забезпечення радіально-фазової стійкості
прискореного пучка використано варіант змінно-фазового фокусування з покроковою зміною синхронної
фази і наростаючою амплітудою ВЧ-поля в прискорюючих зазорах на групуючій ділянці прискорюючо-
фокусуючого тракту прискорювача. Розглянуто способи збільшення струму прискореного пучка іонів, а та-
кож щільності струму пучка на мішені.
http://vant.kipt.kharkov.ua/CONTENTS/CONTENTS_2014_2.html
http://vant.kipt.kharkov.ua/CONTENTS/CONTENTS_2014_2.html
INTRODUCTION
1. HELIUM IONS INJECTOR
2. HELIUM IONS LINAC ACCELERATING STRUCTURE
3. BEAM TRANSPORTING LINE
conclusions
REFERENCES
|
| id | nasplib_isofts_kiev_ua-123456789-147337 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 1562-6016 |
| language | English |
| last_indexed | 2025-12-07T16:42:24Z |
| publishDate | 2018 |
| publisher | Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| record_format | dspace |
| spelling | Dubniuk, S.N. Anokhin, R.A. Dyachenko, A.F. Коbets, А.P. Kravchenko, A.I. Manuilenko, O.V Pavlii, К.V. Reshetnikov, V.N. Shevchenko, A.S. Soshenkо, V.A. Tishkin, S.S. Zajtsev, B.V. Zhuravlyov, A.V. Zhuravlyov, V.G. 2019-02-14T14:13:34Z 2019-02-14T14:13:34Z 2018 Radiation complex on the basis of helium ions linac / S.N. Dubniuk, R.A. Anokhin, A.F. Dyachenko, А.P. Коbets, A.I. Kravchenko, O.V. Manuilenko, К.V. Pavlii, V.N. Reshetnikov, A.S. Shevchenko, V.A. Soshenkо, S.S. Tishkin, B.V. Zajtsev, A.V. Zhuravlyov, V.G. Zhuravlyov // Вопросы атомной науки и техники. — 2018. — № 4. — С. 46-51. — Бібліогр.: 29 назв. — англ. 1562-6016 PACS: 29.17.w, 29.27.Bd https://nasplib.isofts.kiev.ua/handle/123456789/147337 The numerical simulation results and experimental investigation of helium ions linear accelerator with output
 energy 4 MeV and focusing by an RF field are presented. The variant of alternating-phase focusing with a step
 change in the synchronous phase and increasing amplitude of the RF field in accelerating gaps in the grouping section of the accelerating-focusing tract of the accelerator is used to ensure the radial-phase stability of the accelerated
 beam. The methods for increasing the accelerated ion beam current, as well as the beam current density on the target, are considered. Представлено результати чисельного та експериментального дослідження лінійного прискорювача іонів
 гелію з вихідною енергією 4 МеВ і фокусуванням ВЧ-полем. Для забезпечення радіально-фазової стійкості
 прискореного пучка використано варіант змінно-фазового фокусування з покроковою зміною синхронної
 фази і наростаючою амплітудою ВЧ-поля в прискорюючих зазорах на групуючій ділянці прискорюючофокусуючого тракту прискорювача. Розглянуто способи збільшення струму прискореного пучка іонів, а також щільності струму пучка на мішені. Приведены результаты численного моделирования и экспериментального исследования линейного ускорителя ионов гелия с выходной энергией 4 МэВ c фокусировкой ВЧ-полем. Для обеспечения радиальнофазовой устойчивости ускоряемого пучка использован вариант переменно-фазовой фокусировки с шаговым
 изменением синхронной фазы и нарастающей амплитудой ВЧ-поля в ускоряющих зазорах на группирующем участке ускоряюще-фокусирующего тракта ускорителя. Рассмотрены способы увеличения тока ускоряемого пучка ионов, а также плотности тока пучка на мишени. en Національний науковий центр «Харківський фізико-технічний інститут» НАН України Вопросы атомной науки и техники Нерелятивистская электроника Radiation complex on the basis of helium ions linac Радіаційний комплекс на базі лінійного прискорювача іонів гелію Радиационный комплекс на базе линейного ускорителя ионов гелия Article published earlier |
| spellingShingle | Radiation complex on the basis of helium ions linac Dubniuk, S.N. Anokhin, R.A. Dyachenko, A.F. Коbets, А.P. Kravchenko, A.I. Manuilenko, O.V Pavlii, К.V. Reshetnikov, V.N. Shevchenko, A.S. Soshenkо, V.A. Tishkin, S.S. Zajtsev, B.V. Zhuravlyov, A.V. Zhuravlyov, V.G. Нерелятивистская электроника |
| title | Radiation complex on the basis of helium ions linac |
| title_alt | Радіаційний комплекс на базі лінійного прискорювача іонів гелію Радиационный комплекс на базе линейного ускорителя ионов гелия |
| title_full | Radiation complex on the basis of helium ions linac |
| title_fullStr | Radiation complex on the basis of helium ions linac |
| title_full_unstemmed | Radiation complex on the basis of helium ions linac |
| title_short | Radiation complex on the basis of helium ions linac |
| title_sort | radiation complex on the basis of helium ions linac |
| topic | Нерелятивистская электроника |
| topic_facet | Нерелятивистская электроника |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/147337 |
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