The multibeam linear ion accelerator: calculation and experiment
The accelerating structure consisting of cylindrical screen with electrodes of coil types radialy disposed, which the current-conductive annuluses with tubes of driftage disposed azimuth of annulus are attached has been suggested. By way computer simulation were received the base-frequency of stru...
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| Дата: | 2004 |
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України
2004
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| Назва видання: | Вопросы атомной науки и техники |
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| Цитувати: | The multibeam linear ion accelerator: calculation and experiment / N.M. Gavrilov, M.K. Gavrilov, D.A. Bogatchenkov, Е.V. Ivanov, D.A. Komarov, J.N. Strukov // Вопросы атомной науки и техники. — 2004. — № 1. — С. 19-20. — Бібліогр.: 2 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| id |
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irk-123456789-784752015-03-19T03:02:42Z The multibeam linear ion accelerator: calculation and experiment Gavrilov, N.M. Gavrilov, M.K. Bogatchenkov, D.A. Ivanov, Е.V. Komarov, D.A. Strukov, J.N. Состояние действующих и проекты новых ускорителей The accelerating structure consisting of cylindrical screen with electrodes of coil types radialy disposed, which the current-conductive annuluses with tubes of driftage disposed azimuth of annulus are attached has been suggested. By way computer simulation were received the base-frequency of structure, shunt-impedance, distribution of field in the accelerating gaps. The experimental researched of frequencies generation coil in screen and field distribution functions were made. Пропонується прискорююча структура, що складається з циліндричного екрану з радіально розташованими електродами спірального типу, до яких кріпляться струмопровідні кільця з трубками дрейфу, розташованими по азимуту кільця. Шляхом чисельного моделювання були отримані робоча частота, шунтовий імпеданс, розподіл полів в прискорюючих зазорах. Проведено експериментальні дослідження частот збудження спіралі в екрані і розподілу полів. Предлагается ускоряющая структура, состоящая из цилиндрического экрана с радиально расположенными электродами спирального типа, к которым крепятся токопроводящие кольца с трубками дрейфа, расположенными по азимуту кольца. Путем численного моделирования были получены рабочая частота, шунтовой импеданс, распределение поля в ускоряющих зазорах. Проведены экспериментальныеисследования частот возбуждения спирали в экране и распределения поля. 2004 Article The multibeam linear ion accelerator: calculation and experiment / N.M. Gavrilov, M.K. Gavrilov, D.A. Bogatchenkov, Е.V. Ivanov, D.A. Komarov, J.N. Strukov // Вопросы атомной науки и техники. — 2004. — № 1. — С. 19-20. — Бібліогр.: 2 назв. — англ. 1562-6016 PACS: 29.17+w http://dspace.nbuv.gov.ua/handle/123456789/78475 en Вопросы атомной науки и техники Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine |
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| language |
English |
| topic |
Состояние действующих и проекты новых ускорителей Состояние действующих и проекты новых ускорителей |
| spellingShingle |
Состояние действующих и проекты новых ускорителей Состояние действующих и проекты новых ускорителей Gavrilov, N.M. Gavrilov, M.K. Bogatchenkov, D.A. Ivanov, Е.V. Komarov, D.A. Strukov, J.N. The multibeam linear ion accelerator: calculation and experiment Вопросы атомной науки и техники |
| description |
The accelerating structure consisting of cylindrical screen with electrodes of coil types radialy disposed, which
the current-conductive annuluses with tubes of driftage disposed azimuth of annulus are attached has been
suggested. By way computer simulation were received the base-frequency of structure, shunt-impedance,
distribution of field in the accelerating gaps. The experimental researched of frequencies generation coil in screen
and field distribution functions were made. |
| format |
Article |
| author |
Gavrilov, N.M. Gavrilov, M.K. Bogatchenkov, D.A. Ivanov, Е.V. Komarov, D.A. Strukov, J.N. |
| author_facet |
Gavrilov, N.M. Gavrilov, M.K. Bogatchenkov, D.A. Ivanov, Е.V. Komarov, D.A. Strukov, J.N. |
| author_sort |
Gavrilov, N.M. |
| title |
The multibeam linear ion accelerator: calculation and experiment |
| title_short |
The multibeam linear ion accelerator: calculation and experiment |
| title_full |
The multibeam linear ion accelerator: calculation and experiment |
| title_fullStr |
The multibeam linear ion accelerator: calculation and experiment |
| title_full_unstemmed |
The multibeam linear ion accelerator: calculation and experiment |
| title_sort |
multibeam linear ion accelerator: calculation and experiment |
| publisher |
Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| publishDate |
2004 |
| topic_facet |
Состояние действующих и проекты новых ускорителей |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/78475 |
| citation_txt |
The multibeam linear ion accelerator: calculation and experiment / N.M. Gavrilov, M.K. Gavrilov, D.A. Bogatchenkov, Е.V. Ivanov, D.A. Komarov, J.N. Strukov // Вопросы атомной науки и техники. — 2004. — № 1. — С. 19-20. — Бібліогр.: 2 назв. — англ. |
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Вопросы атомной науки и техники |
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THE MULTIBEAM LINEAR ION ACCELERATOR:
CALCULATION AND EXPERIMENT
N.M. Gavrilov, M.K. Gavrilov, D.A. Bogatchenkov, Е.V. Ivanov, D.A. Komarov, J.N. Strukov
The Moscow Engineering - Physical Institute (State University)
The accelerating structure consisting of cylindrical screen with electrodes of coil types radialy disposed, which
the current-conductive annuluses with tubes of driftage disposed azimuth of annulus are attached has been
suggested. By way computer simulation were received the base-frequency of structure, shunt-impedance,
distribution of field in the accelerating gaps. The experimental researched of frequencies generation coil in screen
and field distribution functions were made.
PACS: 29.17+w
This linac is a continuation of high-current linear ion
accelerator [1] based on a multibeam accelerating
resonator.
The resonator comprises a cylindrical screen with
end flanges. The screen comprises supporting elements
as spiral holders connected with each other by potential
electrodes with current-carrying rings so that drifting
channels are arranged with regular intervals by azimuth.
Thus, the system is performed as a double line which
leads to inconveniences in operation: e.g. the presence
of a long electrode results in non-uniform field
distribution, and the need of fastening rings to a
conductor causes a complication in coaxial adjustment
of drift channels. The technical result consists in that in
the offered structure high-frequency and constructive
functions are separated: current-carrying rings installed
on the external screen by means of ceramic holders that
allows one to avoid a long potential electrode, thus
relieving a non-uniform field and complicated
adjustment.
In fig.1 the accelerating resonator with spiral
electrodes is shown.
The accelerating resonator cavity comprises
cylindrical screen 1 with end flanges 2, fixed with
constructive elements 7, 8. Current conducting rings 3
with drift tubes 4 are arranged on them in regular
intervals by azimuth on the above-said cavity mounted
perpendicularly to the axial direction. Each ring is fixed
on the external surface of the screen by means of
ceramic rods 6. The supply of RF current to a surface of
a ring is made by means of spiral electrode 5.
To analyze a similar structure we note the following:
a spiral gives main contribution to the eigenfrequency of
the resonator. Loading with current-conducting rings
results only in capacitor reduction of the frequency
which can be calculated in the approximation of a static
field, i.e. as (l/λ)=1, where l is the geometrical period of
the system, when the field in a gap considered to be
static and analysis could be made by solving the
Laplace equation. In Fig.2 shown are the potential
distributions on radial and longitudinal cross-sections as
an equipotential scheme, obtained by solving a static
task. Fig.3 shows the calculated field distribution in the
accelerating gap. Note, that in case of spiral electrodes,
the current-conducting rings actually have a common
potential and uniform field distribution in the gap that
conforms to experimental results. In case of accelerator
Fig.1. Accelerating resonator with spiral electrodes
working on mode Н211 the field distribution along the
axis is observed to be non-uniform.
___________________________________________________________
PROBLEMS OF ATOMIC SIENCE AND TECHNOLOGY. 2004. № 1.
Series: Nuclear Physics Investigations (42), p. 19-20. 19
Fig. 2. The equipotential scheme of a static task
Fig. 3. Field distribution along the axis z (R1>R2)
To examine the system the model of resonator which
was loaded with four spiral electrodes and current-
conducting rings was made. The number of drift
channels in each ring was equaled to four. At the first
stage of experiment the following problems were set:
1 - examine the influence of spiral electrodes with
each other (for this purpose the resonator was
sequentially loaded with one, two, three and four spirals
and a frequency shift was analyzed);
2 - determine the resonance frequency of a structure
loaded with drift tubes .
The proper value of the wave number was
investigated on three various spirals and comparison
with the values obtained according to the methods of [2]
were made. Values are given in table.
№ Diameter
of a spiral,
cm
Radius of
a coil of
a spiral,
cm
Length
of a
spiral,
cm
Operating
wavelengt
h, m
The
error,
%
1 5 0.5 7.5 λ calc.= 5.25
λexper.=5.42 3
2 5 0.5 6 λ calc.= 4.73
λ exper.=4.92 3.8
3 5 0.5 11 λ calc.= 7.63
λ exper.=7.89 4
Loading simultaneously with several spirals has
showed an insignificant change of a working frequency
that allows one to draw a conclusion on equality of the
frequencies of a spiral and a resonator.
Accelerating cell was simulated for the first variant.
A gap capacity was defined according to the solution of
the Laplace equation said above. Experimental value of
the working frequency was determined:
fexper=33.14 MHz (λexper=9 m). The calculated value of
the wavelength was λ calc.=8.46 m. Thus, it is possible to
conclude that the offered structure allows one to make a
step in development of small-sized industrial
accelerators.
REFERENCES
1. N.M.Gavrilov, D.A.Komarov, D.A.Bogatchenkov,
J.N.Strukov. Numerical modelling of multibeam
accelerating structures. MEPhI, 2003.
2. N.M.Gavrilov, D.A.Komarov, J.N.Strukov. High-
current linear accelerator of ions. Patent
№2183390 R.F. Моscow, 2001.
СИЛЬНОТОЧНЫЙ ЛИНЕЙНЫЙ УСКОРИТЕЛЬ ИОНОВ: РАСЧЕТ И ЭКСПЕРИМЕНТ
Н.М. Гаврилов, М.К. Гаврилов, Д.А. Богаченков, Е.В. Иванов, Д.А. Комаров, Ю.Н. Струков
Предлагается ускоряющая структура, состоящая из цилиндрического экрана с радиально
расположенными электродами спирального типа, к которым крепятся токопроводящие кольца с трубками
дрейфа, расположенными по азимуту кольца. Путем численного моделирования были получены рабочая
частота, шунтовой импеданс, распределение поля в ускоряющих зазорах. Проведены экспериментальные
20
0 35 70 105 140
z, mm
Field on
axis
R1
R2
Ez, rel.
unit.
0,025
0,02
0,015
0,01
0,005
0
z, mm
r,
mm
исследования частот возбуждения спирали в экране и распределения поля.
ПОТУЖНОСТРУМОВИЙ ЛІНІЙНИЙ ПРИСКОРЮВАЧ ІОНІВ: РОЗРАХУНОК І ЕКСПЕРИМЕНТ
М.М. Гаврилов, М.К. Гаврилов, Д.А. Богаченков, Є.В. Іванов, Д.А. Комаров, Ю.Н. Струков
Пропонується прискорююча структура, що складається з циліндричного екрану з радіально
розташованими електродами спірального типу, до яких кріпляться струмопровідні кільця з трубками
дрейфу, розташованими по азимуту кільця. Шляхом чисельного моделювання були отримані робоча
частота, шунтовий імпеданс, розподіл полів в прискорюючих зазорах. Проведено експериментальні
дослідження частот збудження спіралі в екрані і розподілу полів.
21
THE MULTIBEAM LINEAR ION ACCELERATOR:
CALCULATION AND EXPERIMENT
Fig. 2. The equipotential scheme of a static task
REFERENCES
ПОТУЖНОСТРУМОВИЙ ЛІНІЙНИЙ ПРИСКОРЮВАЧ ІОНІВ: РОЗРАХУНОК І ЕКСПЕРИМЕНТ
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