Inductance-capacitor system for tuning of interdigital structure of the ion linear accelerator
Calculations of constructive and electrodynamics characteristics of the Interdigital H accelerating structure for the new MILAC prestripping section (PSS-4) were carried out in 3D version. The effective inductance-capacitor tuning devices (contrivance) as rods located on the drift tube side, opposit...
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| Опубліковано в: : | Вопросы атомной науки и техники |
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| Дата: | 2007 |
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України
2007
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Inductance-capacitor system for tuning of interdigital structure of the ion linear accelerator / V.O. Bomko, A.F. Dyachenko, B.V. Zajtsev, A.P. Kobets, J.V. Ivakhno, K.V. Pavlii, J.N. Fedeneva, S.N. Dubniuk, S.S. Tishkin, Z.E. Ptukhina // Вопросы атомной науки и техники. — 2007. — № 5. — С. 180-183. — Бібліогр.: 6 назв. — англ. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1860091640599805952 |
|---|---|
| author | Bomko, V.O. Dyachenko, A.F. Zajtsev, B.V. Kobets, A.P. Ivakhno, J.V. Pavlii, K.V. Fedeneva, J.N. Dubniuk, S.N. Tishkin, S.S. Ptukhina, Z.E. |
| author_facet | Bomko, V.O. Dyachenko, A.F. Zajtsev, B.V. Kobets, A.P. Ivakhno, J.V. Pavlii, K.V. Fedeneva, J.N. Dubniuk, S.N. Tishkin, S.S. Ptukhina, Z.E. |
| citation_txt | Inductance-capacitor system for tuning of interdigital structure of the ion linear accelerator / V.O. Bomko, A.F. Dyachenko, B.V. Zajtsev, A.P. Kobets, J.V. Ivakhno, K.V. Pavlii, J.N. Fedeneva, S.N. Dubniuk, S.S. Tishkin, Z.E. Ptukhina // Вопросы атомной науки и техники. — 2007. — № 5. — С. 180-183. — Бібліогр.: 6 назв. — англ. |
| collection | DSpace DC |
| container_title | Вопросы атомной науки и техники |
| description | Calculations of constructive and electrodynamics characteristics of the Interdigital H accelerating structure for the new MILAC prestripping section (PSS-4) were carried out in 3D version. The effective inductance-capacitor tuning devices (contrivance) as rods located on the drift tube side, opposite to their holders are developed. It is shown, that the adjusting of interdigital accelerating structure can be carried out with the help only by this simple and effective tuning of system.
Завданням настройки стрічно-штирьової прискорюючої структури, що збуджується на H₁₁₁ хвилі, є отримання необхідної резонансної частоти і отримання рівномірного розподілу прискорюючого поля уздовж зазорів між трубками дрейфу. Труднощі настройки витікають з особливості стрічно-штирьової структури, власних частот комірок резонатора, довжина яких збільшується пропорційно зміні швидкості частинок від вхідного кінця структури до вихідного, що полягають в значному перепаді. Наводяться результати розробки нової індуктивно-ємкісної настроювальної системи у вигляді штирів, що розташовуються конструктивно на бічній стінці трубок дрейфу, протилежно несучим підвіскам. Описаний процес формування з їх допомогою розрахункового розподілу прискорюючого поля в нерегулярній структурі споруджуваного нового прискорювача легких іонів ПОС-4, розрахованого на енергію прискорених іонів 1 МеВ/нуклон.
Задачей настройки встречно-штыревой ускоряющей структуры, возбуждаемой на H₁₁₁ волне, является получение требуемой величины резонансной частоты и получение равномерного распределения ускоряющего поля вдоль зазоров между трубками дрейфа. Трудности настройки вытекают из особенностей встречно-штыревой структуры, заключающихся в значительном перепаде собственных частот ячеек резонатора, длина которых увеличивается пропорционально изменению скорости частиц от входного конца структуры к выходному. Приводятся результаты разработки новой индуктивно-емкостной настроечной системы в виде штырей, располагаемых конструктивно на боковой стенке трубок дрейфа, противоположно несущим подвескам. Описан процесс формирования с их помощью расчетного распределения ускоряющего поля в нерегулярной структуре сооружаемого нового ускорителя легких ионов ПОС-4, рассчитанного на энергию ускоренных ионов 1 МэВ/нуклон.
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| first_indexed | 2025-12-07T17:23:53Z |
| format | Article |
| fulltext |
INDUCTANCE-CAPACITOR SYSTEM FOR TUNING OF
INTERDIGITAL STRUCTURE OF THE ION LINEAR
ACCELERATOR
V.O. Bomko∗, A.F. Dyachenko, B.V. Zajtsev, A.P. Kobets, J.V. Ivakhno,
K.V. Pavlii, Ja.N. Fedeneva, S.N. Dubniuk, S.S. Tishkin, Z.E. Ptukhina
National Science Center ”Kharkov Institute of Physics and Technology”, 61108, Kharkov, Ukraine
(Received May 14, 2007)
The task of tunning of the Interdigital H-structure contain in ensuring uniform distribution of an accelerating field
and alignment of design resonant frequency. Calculations of constructive and electrodynamics characteristics and
tunning procedure of the accelerating structure for the new MILAC prestripping section (PSS-4) are discussion. The
effective inductance-capacitor tuning devices (contrivance) as rods located on the drift tube side, opposite to their
holders are developed. It is shown, that the adjusting of interdigital accelerating structure can be carried out with
the help only by this simple and effective tuning of system.
PACS: 29.17.+w
1. INTRODUCTION
The interdigital type accelerating structure takes
the dates from middle fifties [1, 2]. Lately it widely
used for creation of heavy ion linear accelerators.
This structure is based on a principle of excitation
in the cylindrical resonator of an H111 - mode, which
characteristics is the presence of a longitudinal mag-
netic and cross electrical field. When interdigital sys-
tem with drift tubes located along resonator the lon-
gitudinal component of electrical field appears in gaps
between drift tubes which is used for acceleration of
the charged particles.
Such structure represents the large capacitor and
inductive loading of the resonator, that results to sig-
nificant decreasing (almost in 3 times) of the H111 -
mode resonant frequency. This important feature in-
terdigital type accelerating structure has favourable
an effect for the cross sizes of the resonator, that is
especially important at creation of heavy ions accel-
erators, since their rather low speed requires the ap-
propriate increase of a operating wavelengs. Other
important feature of the interdigital type accelerat-
ing structure is the ability to retain π - mode regime,
which allows a 2 - time increase of accelerating rate
in comparison with mode of operations on 2π mode
regime, which is peculiar to structure Alwarez, where
E010 - mode is used.
When the resonator is loaded by interdigital ac-
celerating structure an essential difference of own cell
frequency takes place depending on their length. In
rather long resonators designed for a gain of speed
accelerating ions in 2 - 3 times, the relative increase
of own frequency of cells on the entrance and exit end
of the accelerator can make 30 − 50 percents. The
task of tuning contain in ensuring quasyuniform dis-
tribution of an accelerating field along accelerating
structure, consists not only in alignment of frequen-
cies, but also in compensation of fall of a field level
on the structure ends of the resonator peculiar to H
- structures. For this reason, effective tuning systems
and combination of tuning devices required, which
will allow to compensate the appointed deviation and
to achieve thus of the required working frequency.
2. METHODS OF TUNING OF
INTERDIGITAL ACCELERATING
STRUCTURES
During development and creation of interdigital
accelerating structures at the various accelerating
centres were developed the their own methods and
devices of the tuning. By the way of their impact
on accelerating field distribution tuning systems are
subdivided on inductive, capacitor and resonant. In
structures of a drift tube comb type the constant dif-
ference of potentials between drift tubes take place,
thus an accelerating field value falls with growth of
cell length of structure and accordingly acceleration
rate decrease. The tuning in this case does not play
an essential role. On such principle the heavy ion lin-
ear accelerator is constructed in laboratory of Munich
[3]. More perfect accelerating structure is constructed
in prestriping part of UNILAC GSI [4] where the for-
mation of an accelerating field is carried out with
the help of inducers. Reasonable high acceleration
rate in this case is achieved by division of acceler-
ating structure into sections in which the difference
∗Corresponding author. E-mail address: bomko@kipt.kharkov.ua
180 PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY, 2007, N5.
Series: Nuclear Physics Investigations (48), p.180-183.
of potentials is increased with growth of lengths of
accelerating cells.
An effective method was developed for adjust-
ing the cells of the accelerating structure Kharkov
MILAC poststriper using additional current-carrying
rods located at an angle to the supporting rod (Fig.1).
This method of tuning the inductive accelerating cell
parameters allowed formation of a uniform acceler-
ating field distribution along the structure. This al-
lowed to increase significantly the acceleration rate.
Additionally, a method was developed for adjust-
ing the field distribution using the ending resonance
adjusting device (ERAD). Thus, the main section
11.25 m in length with 39 drift tubes, of which 19
contain magnetic quadrupoles gives a possibility to
accelerate ions with A/q ≤ 5 at the frequency of
47.2 MHz from 0.975 to 8.5 MeV/u. Total accelera-
tion rate in the main section is 3.2 MeV/m.
Fig.1. Accelerating structure Kharkov MILAC
poststriper
3. DESIGN FEATURES THE
ACCELERATING STRUCTURE PSS-4
Development and construction of the new pre-
stripping section for multicharge ion linear acceler-
ator (MILAC) designed for acceleration of He+ ion
beam from 30 keV/u to 975 keV/u are presented. In
the accelerating interdigital IH structure using the
method of alternating phase focusing with stepped
changing the synchronous phase along the focusing
period. Efficiency of this method depends strongly
on configuration of each focusing period. The struc-
ture of the focusing period in the construction being
discussed contains a number of cells where the syn-
chronous phase changes discretely from the cells with
negative (grouping) phases passing the cells having
the phase smaller in absolute value through ϕs = 0
to the zone of positive (focusing) phases and ends
with transition to the zone of negative phases. Such
arrangement of synchronous phases provides the cap-
ture of high current ion beam being injected in the
phase angle of 1200 and its radial and phase stabil-
ity along the accelerating structure, and gives a pos-
sibility to hold the acceleration rate at rather high
level. Calculations of constructive and electrodynam-
ics characteristics were carried out in 3D version. The
procedure of ’manual control’ was used which means
that the geometrical sizes were sequentially changed
for obtaining the required values of necessary charac-
teristics. In the process of optimization of the struc-
ture parameters (cavity diameter, cavity shape, the
drift tube diameters, diameters of the drift tube hold-
ers) were adjusted to the required values.
In the process of tuning the end resonance de-
vice were used which represent quarter wave ending
resonant device (inducer); on the side of the inducer
facing the side wall of the cavity a control piston
is placed which can move in longitudinal direction.
Such systems are installed on the input and out-
put ends of the cavity. The results of calculations
of geometrical and electro-dynamical characteristics
are presented in the table and schematic view of the
PSS-4 accelerating structure - on Fig.2.
Input ion energy 30 keV/u
Output ion energy 975 keV/u
Operating frequency 47.2 MHz
Growing accelerating field 85 kV/cm
Total acceleration rate 1.6 MeV/m
Cavity length 2395 mm
Number of accelerating cells 32
Cavity diameter 107.5 sm
Pulsed current of accelerated ions 12 mA
Angle of beam capture 1200
Q-factor of the cavity 12000
Shunt impedance 50 MΩ/m
Pulse repetition rate 12.5 Hz
Fig.2. Schematic view of the PSS-4 accelerating
structure
Fig.3. Distribution accelerating field in PSS-4
181
The PSS-4 accelerating structure is designed for
low input energy of ions (30 keV/u) and high pulsed
beam current (12 mA); therefore accelerating field
distribution in the initial part of the structure was
take as increasing from cells to cells in order to pro-
vide the maximum capture of particles in a mode of
stable longitudinal motion. In this case the width
and depth of the potential well in which the particles
moved increases significantly. The obtained distri-
bution of accelerating field along the gaps is shown
on Fig.3. Growing field in the initial part of the
structure and constant field in the following one is
achieved with accuracy sufficient for stable dynamics
of the high current ion bunches being accelerated.
4. ADDITIONAL TUNING DEVICE
In the process of manufacturing and assembling
the elements of the accelerating structure PSS − 4
it appeared that the frequency is higher than the
operating frequency by 900 kHz though electric field
distribution was close to the calculated one. There-
fore development of additional tuning devices was
necessary acting on the electric field. The investi-
gations were carried through calculations. We de-
velop variant extreme simple and effective method of
inductance-capacitor tuning. The effect such tuning
system on electrical field decrease own frequency of
the resonator, that allows once more to reduce a di-
ameter of the resonator and to generate practically
uniform accelerating field ensuring the highest rate
of acceleration. In this case tuners represent a sim-
ple design as rods, located on the drift tube from
the side opposite to their holders. They form thus,
together with adjacent of drift tube holders addi-
tional capacitive and inductive loading, that causes
the appropriate decreasing of the own cell frequen-
cies and local increase of an electrical field in gaps
between drift tubes. In the present statement such
elements of inductance-capacitor loading are named
”contrivance”.
Fig.4. Distribution of an electrical field in gaps:
a) initial; b) uniform field
The approbation of a tuning method with an
inductance-capacitor type devices in view of the con-
trivances was executed on another structure designed
for acceleration of heavy ions from energy 220 keV/u
up to 1000 keV/u at working frequencies 47, 2 MGz.
Fig.4 represented distribution of an electrical field in
gaps: a) initial and b) uniform field received as a
result of tuning with help only of the contrivance.
From a Fig.4 it is possible to see, that for compensa-
tion of the strongly deformed distribution of a field
caused by fall of capacitor loading with increase of
gap length between drift tubes of a constant diame-
ter, it was required to establish some of contrivances
on second half of structure.
The described inductance-capacitor system was
successfully applied for additional tuning of acceler-
ating structure PSS-4. Thus the dismantle of drift
tubes was not required. Additional tuning devices
are established with the help of spring contacts on
a lateral wall several of drift tubes. In result by
selection of length contrivance and corner of their
installation concerning a plane of an arrangement
of accelerating structure the required distribution of
an accelerating field and calculated frequency of the
resonator was received. In a Fig.5 the internal view
of the resonator PSS-4 is given.
Fig.5. PSS-4 accelerating structure
5. CONCLUSION
The new effective inductance-capacitor tuning de-
vices (contrivance) as rods located on the drift tube
side, opposite to their holders are developed. At the
certain design the exact local tuning of cells is possi-
ble for carrying out not only selection of contrivance
length, but also by change of a corner of their dispo-
sition concerning an axis of drift tube holders. The
high efficiency such inductance-capacitor tuning sys-
tem allows to receive required electro-dynamic char-
acteristics of accelerating structure at an identical
small diameter of drift tubes, that considerably sim-
plifies their design, reduces a radiating background
around of the accelerator and prevents occurrence of
the multypaction high-frequency discharges.
182
REFERENCES
1. P.Blewett. Linear Accelerator s Injectors for Pro-
ton Synchrotrons // Proc. Symposium on High
EnergyAccelerators and Pion Phisics, Geneva,
CERN. 1956, v.1, p.162.
2. B.A.Bomko, E.I.Revutsky // Sov. Journal of
Tecchnic Phisic. 1964, v.34, p.1260.
3. U.Ratzinger, E.Nolte, R.Geler, M.Gartner //
Nucl. Instr. and Meth. 1988, A.263, p.261.
4. U.Ratzinger, K.Kaspar, E.Malwitz, S, Minaev,
R.Tiede // Nucl. Instr. and Meth. 1998, A.415,
p.281.
5. V.A.Bomko, A.F.Dyachenko, A.F.Kobets et al.
// Rev. of Sc. Instruments. 1998, v.69, N10,
p.3537.
6. PV.A.Bomko, A.F.Dyachenko, A.V.Pipa //
Problems of Atomic Science and Technology.
1981, v.3(9), p.28.
ИНДУКТИВНО-ЕМКОСТНАЯ СИСТЕМА НАСТРОЙКИ ВСТРЕЧНО-ШТЫРЕВОЙ
СТРУКТУРЫ ЛИНЕЙНОГО УСКОРИТЕЛЯ ИОНОВ
В.А. Бомко, А.Ф. Дьяченко, Б.В. Зайцев, А.Ф. Кобец, Е.В. Ивахно, К.В. Павлий,
Я.Н. Феденева, С.Н. Дубнюк, С. С. Тишкин, З.Е. Птухина
Задачей настройки встречно-штыревой ускоряющей структуры, возбуждаемой на H111 волне, яв-
ляется получение требуемой величины резонансной частоты и получение равномерного распределения
ускоряющего поля вдоль зазоров между трубками дрейфа. Приводятся результаты разработки новой
индуктивно-емкостной настроечной системы в виде штырей, располагаемых конструктивно на боковой
стенке трубок дрейфа, противоположно несущим подвескам. Описан процесс формирования с их по-
мощью расчетного распределения ускоряющего поля в нерегулярной структуре сооружаемого нового
ускорителя легких ионов ПОС - 4, рассчитанного на энергию ускоренных ионов 1 МэВ/нуклон.
IНДУКТИВНО-ЄМКIСНА СИСТЕМА НАСТРОЙКИ СТРIЧНО-ШТИРЬОВОЇ
СТРУКТУРИ ЛIНIЙНОГО ПРИСКОРЮВАЧА IОНIВ
В.О. Бомко, А.Ф. Дьяченко, Б.В. Зайцев, А.П. Кобець, Е.В. Iвахно, К.В. Павлiй,
Я.Н. Феденьова, С.Н. Дубнюк, C.C. Тiшкiн, З.O. Птухiна
Завданням настройки стрiчно-штирьової прискорюючої структури, що збуджується на H111 хвилi,
є отримання необхiдної резонансної частоти i отримання рiвномiрного розподiлу прискорюючого по-
ля уздовж зазорiв мiж трубками дрейфу. Наводяться результати розробки нової iндуктивно-ємкiсної
настроювальної системи у виглядi штирiв, що розташовуються конструктивно на бiчнiй стiнцi трубок
дрейфу, протилежно несучим пiдвiскам. Описаний процес формування з їх допомогою розрахункового
розподiлу прискорюючого поля в нерегулярнiй структурi споруджуваного нового прискорювача легких
iонiв ПОС-4, розрахованого на енергiю прискорених iонiв 1 МеВ/нуклон.
183
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| id | nasplib_isofts_kiev_ua-123456789-110559 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 1562-6016 |
| language | English |
| last_indexed | 2025-12-07T17:23:53Z |
| publishDate | 2007 |
| publisher | Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| record_format | dspace |
| spelling | Bomko, V.O. Dyachenko, A.F. Zajtsev, B.V. Kobets, A.P. Ivakhno, J.V. Pavlii, K.V. Fedeneva, J.N. Dubniuk, S.N. Tishkin, S.S. Ptukhina, Z.E. 2017-01-04T19:26:53Z 2017-01-04T19:26:53Z 2007 Inductance-capacitor system for tuning of interdigital structure of the ion linear accelerator / V.O. Bomko, A.F. Dyachenko, B.V. Zajtsev, A.P. Kobets, J.V. Ivakhno, K.V. Pavlii, J.N. Fedeneva, S.N. Dubniuk, S.S. Tishkin, Z.E. Ptukhina // Вопросы атомной науки и техники. — 2007. — № 5. — С. 180-183. — Бібліогр.: 6 назв. — англ. 1562-6016 PACS: 29.17.+w https://nasplib.isofts.kiev.ua/handle/123456789/110559 Calculations of constructive and electrodynamics characteristics of the Interdigital H accelerating structure for the new MILAC prestripping section (PSS-4) were carried out in 3D version. The effective inductance-capacitor tuning devices (contrivance) as rods located on the drift tube side, opposite to their holders are developed. It is shown, that the adjusting of interdigital accelerating structure can be carried out with the help only by this simple and effective tuning of system. Завданням настройки стрічно-штирьової прискорюючої структури, що збуджується на H₁₁₁ хвилі, є отримання необхідної резонансної частоти і отримання рівномірного розподілу прискорюючого поля уздовж зазорів між трубками дрейфу. Труднощі настройки витікають з особливості стрічно-штирьової структури, власних частот комірок резонатора, довжина яких збільшується пропорційно зміні швидкості частинок від вхідного кінця структури до вихідного, що полягають в значному перепаді. Наводяться результати розробки нової індуктивно-ємкісної настроювальної системи у вигляді штирів, що розташовуються конструктивно на бічній стінці трубок дрейфу, протилежно несучим підвіскам. Описаний процес формування з їх допомогою розрахункового розподілу прискорюючого поля в нерегулярній структурі споруджуваного нового прискорювача легких іонів ПОС-4, розрахованого на енергію прискорених іонів 1 МеВ/нуклон. Задачей настройки встречно-штыревой ускоряющей структуры, возбуждаемой на H₁₁₁ волне, является получение требуемой величины резонансной частоты и получение равномерного распределения ускоряющего поля вдоль зазоров между трубками дрейфа. Трудности настройки вытекают из особенностей встречно-штыревой структуры, заключающихся в значительном перепаде собственных частот ячеек резонатора, длина которых увеличивается пропорционально изменению скорости частиц от входного конца структуры к выходному. Приводятся результаты разработки новой индуктивно-емкостной настроечной системы в виде штырей, располагаемых конструктивно на боковой стенке трубок дрейфа, противоположно несущим подвескам. Описан процесс формирования с их помощью расчетного распределения ускоряющего поля в нерегулярной структуре сооружаемого нового ускорителя легких ионов ПОС-4, рассчитанного на энергию ускоренных ионов 1 МэВ/нуклон. en Національний науковий центр «Харківський фізико-технічний інститут» НАН України Вопросы атомной науки и техники Теория и техника ускорения частиц Inductance-capacitor system for tuning of interdigital structure of the ion linear accelerator Індуктивно-ємкісна система настройки стрічно-штирьової структури лінійного прискорювача іонів Индуктивно-емкостная система настройки встречно-штыревой структуры линейного ускорителя ионов Article published earlier |
| spellingShingle | Inductance-capacitor system for tuning of interdigital structure of the ion linear accelerator Bomko, V.O. Dyachenko, A.F. Zajtsev, B.V. Kobets, A.P. Ivakhno, J.V. Pavlii, K.V. Fedeneva, J.N. Dubniuk, S.N. Tishkin, S.S. Ptukhina, Z.E. Теория и техника ускорения частиц |
| title | Inductance-capacitor system for tuning of interdigital structure of the ion linear accelerator |
| title_alt | Індуктивно-ємкісна система настройки стрічно-штирьової структури лінійного прискорювача іонів Индуктивно-емкостная система настройки встречно-штыревой структуры линейного ускорителя ионов |
| title_full | Inductance-capacitor system for tuning of interdigital structure of the ion linear accelerator |
| title_fullStr | Inductance-capacitor system for tuning of interdigital structure of the ion linear accelerator |
| title_full_unstemmed | Inductance-capacitor system for tuning of interdigital structure of the ion linear accelerator |
| title_short | Inductance-capacitor system for tuning of interdigital structure of the ion linear accelerator |
| title_sort | inductance-capacitor system for tuning of interdigital structure of the ion linear accelerator |
| topic | Теория и техника ускорения частиц |
| topic_facet | Теория и техника ускорения частиц |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/110559 |
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