Optimization parameters of a part of accelerating structure with drift tubes prestripping section the MILAC heavy ion linear accelerator
Investigations on optimization of parameters of a part of accelerating structure with drift tubes prestripping section PSS-20 for acceleration of heavy ions with the relation of their mass to charge A/q≤20 are prolonged. On the second part of acceleration of ions from 150 keV/ nucl. up to 1 MeV/ nuc...
Збережено в:
| Опубліковано в: : | Вопросы атомной науки и техники |
|---|---|
| Дата: | 2014 |
| Автори: | , , , |
| Формат: | Стаття |
| Мова: | English |
| Опубліковано: |
Національний науковий центр «Харківський фізико-технічний інститут» НАН України
2014
|
| Теми: | |
| Онлайн доступ: | https://nasplib.isofts.kiev.ua/handle/123456789/79990 |
| Теги: |
Додати тег
Немає тегів, Будьте першим, хто поставить тег для цього запису!
|
| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Optimization parameters of a part of accelerating structure with drift tubes prestripping section the MILAC heavy ion linear accelerator / V.O. Bomko, B.V. Zajtsev, A.P. Kobets, Yu.V. Meleshkova // Вопросы атомной науки и техники. — 2014. — № 3. — С. 37-39. — Бібліогр.: 10 назв. — англ. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| id |
nasplib_isofts_kiev_ua-123456789-79990 |
|---|---|
| record_format |
dspace |
| spelling |
Bomko, V.O. Zajtsev, B.V. Kobets, A.P. Meleshkova, Yu.V. 2015-04-09T14:17:31Z 2015-04-09T14:17:31Z 2014 Optimization parameters of a part of accelerating structure with drift tubes prestripping section the MILAC heavy ion linear accelerator / V.O. Bomko, B.V. Zajtsev, A.P. Kobets, Yu.V. Meleshkova // Вопросы атомной науки и техники. — 2014. — № 3. — С. 37-39. — Бібліогр.: 10 назв. — англ. 1562-6016 PACS: 29.17.+w https://nasplib.isofts.kiev.ua/handle/123456789/79990 Investigations on optimization of parameters of a part of accelerating structure with drift tubes prestripping section PSS-20 for acceleration of heavy ions with the relation of their mass to charge A/q≤20 are prolonged. On the second part of acceleration of ions from 150 keV/ nucl. up to 1 MeV/ nucl. the highest rate of acceleration is created interdigital-H (IH) accelerating structure with drift tubes. Radially-phase stability of the accelerated bunch of ions is provided with a combination of alternative phase focusing with updating of high-frequency focusing. Продолжены исследования по оптимизации параметров участка ускоряющей структуры с трубками дрейфа предобдирочной секции ПОС-20 для ускорения тяжёлых ионов с отношением их массы к заряду A/q≤20. На втором участке ускорения ионов от 150 кэВ/нукл. до 1 МэВ/нукл. наиболее высокий темп ускорения создаёт встречно-штыревая ускоряющая Н-структура с трубками дрейфа. Радиально-фазовая устойчивость ускоренного пучка ионов обеспечивается комбинацией переменно-фазовой фокусировки с модификацией высокочастотной фокусировки. Продовжені дослідження з оптимізації параметрів ділянки прискорюючої структури із трубками дрейфу передобдиркової секції ПОС-20 для прискорення важких іонів з відношенням їх маси до заряду A/q≤20. На другій ділянці прискорення іонів від 150 кеВ/нукл. до 1 МеВ/нукл. найбільш високий темп прискорення створює зустрічно-штирьова прискорююча Н-структура із трубками дрейфу. Радіально-фазова стійкість прискореного пучка іонів забезпечується комбінацією перемінно-фазового фокусування з модифікацією високочастотного фокусування. en Національний науковий центр «Харківський фізико-технічний інститут» НАН України Вопросы атомной науки и техники Теория и техника ускорения частиц Optimization parameters of a part of accelerating structure with drift tubes prestripping section the MILAC heavy ion linear accelerator Оптимизация параметров участка ускоряющей структуры с трубками дрейфа предобдирочной секции линейного ускорителя лумзи Оптимізація параметрів ділянки прискорюючої структури з трубками дрейфу передобдиркової секції лінійного прискорювача лумзі Article published earlier |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| title |
Optimization parameters of a part of accelerating structure with drift tubes prestripping section the MILAC heavy ion linear accelerator |
| spellingShingle |
Optimization parameters of a part of accelerating structure with drift tubes prestripping section the MILAC heavy ion linear accelerator Bomko, V.O. Zajtsev, B.V. Kobets, A.P. Meleshkova, Yu.V. Теория и техника ускорения частиц |
| title_short |
Optimization parameters of a part of accelerating structure with drift tubes prestripping section the MILAC heavy ion linear accelerator |
| title_full |
Optimization parameters of a part of accelerating structure with drift tubes prestripping section the MILAC heavy ion linear accelerator |
| title_fullStr |
Optimization parameters of a part of accelerating structure with drift tubes prestripping section the MILAC heavy ion linear accelerator |
| title_full_unstemmed |
Optimization parameters of a part of accelerating structure with drift tubes prestripping section the MILAC heavy ion linear accelerator |
| title_sort |
optimization parameters of a part of accelerating structure with drift tubes prestripping section the milac heavy ion linear accelerator |
| author |
Bomko, V.O. Zajtsev, B.V. Kobets, A.P. Meleshkova, Yu.V. |
| author_facet |
Bomko, V.O. Zajtsev, B.V. Kobets, A.P. Meleshkova, Yu.V. |
| topic |
Теория и техника ускорения частиц |
| topic_facet |
Теория и техника ускорения частиц |
| publishDate |
2014 |
| language |
English |
| container_title |
Вопросы атомной науки и техники |
| publisher |
Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| format |
Article |
| title_alt |
Оптимизация параметров участка ускоряющей структуры с трубками дрейфа предобдирочной секции линейного ускорителя лумзи Оптимізація параметрів ділянки прискорюючої структури з трубками дрейфу передобдиркової секції лінійного прискорювача лумзі |
| description |
Investigations on optimization of parameters of a part of accelerating structure with drift tubes prestripping section PSS-20 for acceleration of heavy ions with the relation of their mass to charge A/q≤20 are prolonged. On the second part of acceleration of ions from 150 keV/ nucl. up to 1 MeV/ nucl. the highest rate of acceleration is created interdigital-H (IH) accelerating structure with drift tubes. Radially-phase stability of the accelerated bunch of ions is provided with a combination of alternative phase focusing with updating of high-frequency focusing.
Продолжены исследования по оптимизации параметров участка ускоряющей структуры с трубками дрейфа предобдирочной секции ПОС-20 для ускорения тяжёлых ионов с отношением их массы к заряду A/q≤20. На втором участке ускорения ионов от 150 кэВ/нукл. до 1 МэВ/нукл. наиболее высокий темп ускорения создаёт встречно-штыревая ускоряющая Н-структура с трубками дрейфа. Радиально-фазовая устойчивость ускоренного пучка ионов обеспечивается комбинацией переменно-фазовой фокусировки с модификацией высокочастотной фокусировки.
Продовжені дослідження з оптимізації параметрів ділянки прискорюючої структури із трубками дрейфу передобдиркової секції ПОС-20 для прискорення важких іонів з відношенням їх маси до заряду A/q≤20. На другій ділянці прискорення іонів від 150 кеВ/нукл. до 1 МеВ/нукл. найбільш високий темп прискорення створює зустрічно-штирьова прискорююча Н-структура із трубками дрейфу. Радіально-фазова стійкість прискореного пучка іонів забезпечується комбінацією перемінно-фазового фокусування з модифікацією високочастотного фокусування.
|
| issn |
1562-6016 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/79990 |
| citation_txt |
Optimization parameters of a part of accelerating structure with drift tubes prestripping section the MILAC heavy ion linear accelerator / V.O. Bomko, B.V. Zajtsev, A.P. Kobets, Yu.V. Meleshkova // Вопросы атомной науки и техники. — 2014. — № 3. — С. 37-39. — Бібліогр.: 10 назв. — англ. |
| work_keys_str_mv |
AT bomkovo optimizationparametersofapartofacceleratingstructurewithdrifttubesprestrippingsectionthemilacheavyionlinearaccelerator AT zajtsevbv optimizationparametersofapartofacceleratingstructurewithdrifttubesprestrippingsectionthemilacheavyionlinearaccelerator AT kobetsap optimizationparametersofapartofacceleratingstructurewithdrifttubesprestrippingsectionthemilacheavyionlinearaccelerator AT meleshkovayuv optimizationparametersofapartofacceleratingstructurewithdrifttubesprestrippingsectionthemilacheavyionlinearaccelerator AT bomkovo optimizaciâparametrovučastkauskorâûŝeistrukturystrubkamidreifapredobdiročnoisekciilineinogouskoritelâlumzi AT zajtsevbv optimizaciâparametrovučastkauskorâûŝeistrukturystrubkamidreifapredobdiročnoisekciilineinogouskoritelâlumzi AT kobetsap optimizaciâparametrovučastkauskorâûŝeistrukturystrubkamidreifapredobdiročnoisekciilineinogouskoritelâlumzi AT meleshkovayuv optimizaciâparametrovučastkauskorâûŝeistrukturystrubkamidreifapredobdiročnoisekciilineinogouskoritelâlumzi AT bomkovo optimízacíâparametrívdílânkipriskorûûčoístrukturiztrubkamidreifuperedobdirkovoísekcíílíníinogopriskorûvačalumzí AT zajtsevbv optimízacíâparametrívdílânkipriskorûûčoístrukturiztrubkamidreifuperedobdirkovoísekcíílíníinogopriskorûvačalumzí AT kobetsap optimízacíâparametrívdílânkipriskorûûčoístrukturiztrubkamidreifuperedobdirkovoísekcíílíníinogopriskorûvačalumzí AT meleshkovayuv optimízacíâparametrívdílânkipriskorûûčoístrukturiztrubkamidreifuperedobdirkovoísekcíílíníinogopriskorûvačalumzí |
| first_indexed |
2025-11-26T01:25:59Z |
| last_indexed |
2025-11-26T01:25:59Z |
| _version_ |
1850601965037289472 |
| fulltext |
ISSN 1562-6016. ВАНТ. 2014. №3(91) 37
OPTIMIZATION PARAMETERS OF A PART OF ACCELERATING
STRUCTURE WITH DRIFT TUBES PRESTRIPPING SECTION
THE MILAC HEAVY ION LINEAR ACCELERATOR
V.O. Bomko, B.V. Zajtsev, A.P. Kobets, Yu.V. Meleshkova
National Science Center “Kharkov Institute of Physics and Technology”, Kharkov, Ukraine
E-mail: kobets@kipt.kharkov.ua
Investigations on optimization of parameters of a part of accelerating structure with drift tubes prestripping sec-
tion PSS-20 for acceleration of heavy ions with the relation of their mass to charge A/q≤20 are prolonged. On the
second part of acceleration of ions from 150 keV/ nucl. up to 1 MeV/ nucl. the highest rate of acceleration is created
interdigital-H (IH) accelerating structure with drift tubes. Radially-phase stability of the accelerated bunch of ions is
provided with a combination of alternative phase focusing with updating of high-frequency focusing.
PACS: 29.17.+w
INTRODUCTION
The purpose of making new prestripping section
PSS-20 for the heavy ion linear accelerator MILAC is
the possibility of substantial increase of intensity accel-
erated heavy ions beam of a wide gamut masses. It is
supposed to raise a current accelerated beam on two
orders and to provide possibility of acceleration ions of
any elements of periodic system. It can be reached at the
expense of use in initial part PSS-20 of accelerating
structure with Radio-Frequency Quadrupole focusing
(RFQ) [1 - 3] which allows to almost capture an injected
heavy ions beam and in the course of its acceleration in
a gamut 6…150 keV/nucl. to carry out formation of
parameters beam with high radially-phase characteris-
tics. Working out of site RFQ and effects is executed
are given in publications [4 - 7]. The heavy ions beam
generated thus is accelerated from 150 to 975 keV/nucl.
in interdigital-H (IH) accelerating structure with drift
tubes on wave H110 [6, 7] which provides much higher
rate of acceleration, maintaining its basic characteristics.
Specificity viewed PSS-20 consists that both sites of
accelerating structure are supposed to be combined in
one resonator raised by high-frequency power on opera-
tional frequency, peculiar MILAC, 47.2 MHz. On site
RFQ and on site with drift tubes it is necessary to pro-
vide demanded quantities of lapse rates of an accelerat-
ing field. Practically, working out of methods of ad-
justment of both sites on a uniform distribution of quan-
tity of a potential difference between electrodes in struc-
ture RFQ 100 кV and an electric field between drift
tubes 90 kV/cm, is required.
ACCELERATING STRUCTURE OF SITE
WITH DRIFT TUBES PRESTRIPPING
SECTION PSS-20
On a site of accelerating structure with drift tubes is
used the interdigital-H (IH) accelerating structure raised
on wave Н110.
Feature of this accelerating structure is the essential
magnification of a working wave length. It is especially
important for acceleration of heavy ions with the high
relation of mass to a charge A/q=20.
Thus, considering that acceleration is carried out on
π − a wave, there is a possibility to raise rate of acceler-
ation in 2 times in comparison with structure of type
Alvarez. Calculation of accelerating structure with drift
tubes in a gamut of energies 150…975 keV/nucl. is exe-
cuted. Effects are given in the table.
Parameters of accelerating structure DTL for PSS-20
Parameters Value
Input energy, keV/nucl. 151
Output energy, keV/nucl. 975
Mass to charge ratio, A/q 20
Operating frequency, MHz 47.2
Synchronous phase, deg -10
Number of drift tubes 42
Cavity length,cm 422.9
Tank diameter, cm 110
Acceleration rate, MeV/m 2,9
Input beam emittance, π·mm·mrad 0.456
Output beam emittance, π·mm·mrad 0.84
Longitudinal capture, % 90
Transmission, % 60
Pulsed current of accelerated ions, mA 4.5
Apparently, the full length of a site makes 423 сm,
quantity of tubes of drift 42 which provides acceleration
of ions with A/q=20 in a gamut of energies
151…975 keV/nucl. Focusing of beam in the course of
acceleration is carried out by means of corresponding
selection of quantity of a synchronous phase which is
constant on the first 15 cells and is equal 0°, and on all
subsequent cells is equal -10°, besides on an input of 17
drift tubes focalizing nets are erected.
Fig. 1. Radial trajectories of a motion ions for DTL
ISSN 1562-6016. ВАНТ. 2014. №3(91) 38
All it provides demanded radial and phase stability
of beam in the course of acceleration. On Fig. 1 is given
dynamics of radial oscillations of the ions beam injected
within radius ±4 мм and the phase extent within 30°.
Calculations show that such structure in a combina-
tion with site RFQ provides transmission of beam to
60%. The radial emittance of the beam at the input is
0.456π·mm·mrad, and at the output the emittance is
0.84π·mm·mrad.
PROCEDURE AND DEVICES
OF ADJUSTMENT OF ACCELERATING
STRUCTURE
At coupling of two diverse structures, RFQ and DTL
in one resonator it is necessary to maintain level of elec-
trodynamic parameters on each of sites up-to-the-mark.
For this purpose presence of the effective adjusting de-
vices providing as local, so global adjustment of alloca-
tion of the accelerating field along each of sites is nec-
essary. Now there are available such devices of adjust-
ment which allow to carry out tasks in view. Initial pro-
cess of adjustment is carried out by mathematical mod-
elling of accelerating structure by means of 3 measured
solutions. As local systems selection of quantities of
diameter of drift tubes can be used, thus change capaci-
tive characteristics of cells which involve changes of
their natural frequencies and accordingly quantity of
accelerating field strength. Other devices of adjustment
having the inductive character of local action, represents
so-called “contrivance” in a view rods located on the
drift tube side, opposite to their holders [8]. These de-
vices are used in practice in structure of accelerator
PSS-4 [9], and also have shown high efficiency at ad-
justment of a site of accelerating structure RFQ for PSS-
20.
As the device of global action on electrodynamic pa-
rameters of accelerating structure the ending resonance
devices of adjustment located on the input and output
accelerating structure [10] are used. On the ending de-
vices of adjustment are located the mobile pistons which
allow to regulate distribution of an accelerating field at
respective alteration of their natural resonance frequen-
cy. In a Fig. 2 is given the general view of accelerating
structure IH-DTL for PSS-20.
Fig. 2. The General view of accelerating structure
IH-DTL for PSS-20
Apparently from a Fig. 2 the diameter drift tubes
grows with magnification of length of cells from 50 mm
on the input accelerating structure to 80 mm on an exit.
Adjustment devices in a view “contrivance” are concen-
trated in the core to initial and ending sites of structure,
considering that in interdigital-H (IH) accelerating
structure distribution of an accelerating field in ideal
equidistant variant has sinusoidal character.
In a viewed variant of a site with drift tubes takes
place proliferation of an accelerating field on the two
first cells and rapid slump on the ending sites of struc-
ture. Electric field distribution along the accelerating
structure IH-DTL for PSS-20 is given in Fig. 3.
Fig. 3. Electric field distribution along the accelerating
structure IH-DTL for PSS-20
In the coupling structure consisting of diverse sites
with RFQ and DTL there is a necessity for global char-
acter of adjustment of electrodynamic parameters by
change of natural frequency of all site of structure with-
out changing of character of distribution accelerating
field, its level is thus regulated only. As such devices of
adjustment can be used volume devices which entered
into resonator field where high level of a magnetic field
takes place. This field is located on the periphery of the
resonator which are at an angle 90° in relation to plane
of accelerating structure. In Fig. 4 the variant of an ar-
rangement of such devices of adjustment for site DTL in
PSS-20 is given. Six adjusting devices allows to change
natural frequency of the resonator in limits 0.25 MHz.
Fig. 4. The General view of accelerating structure
IH-DTL for PSS-20 with devices of adjustment
CONCLUSIONS
The procedure of formation of demanded electrody-
namic parameters of a site accelerating structure with
drift tubes for created new prestripping sections PSS-20
on initial part of the multicharging ions linac MILAC is
developed. Calculation of accelerating structure in
which bottom the variant of radially-phase stability of a
beam in the course of acceleration of heavy ions with
the relation of mass to charge A/q=20 is executed. Gen-
erated on a site with Radio-Frequency Quadrupole fo-
cusing (RFQ) the heavy ions beam prolongs will be
accelerated in structure with drift tubes, maintaining
demanded radially-phase parameters and high intensity.
New PSS-20 will allow more, than on two orders to
ISSN 1562-6016. ВАНТ. 2014. №3(91) 39
raise a current of the beam accelerated ions in compari-
son with existing PSS-15 and considerably to dilate a
gamut of their masses. The problems arising at coupling
of two diverse structures in one resonator are viewed.
The procedure and devices adjustment of frequency is
developed at maintenance of demanded distribution of
accelerating fields along each sites of accelerating struc-
ture PSS-20.
REFERENCES
1. I.M. Kapchinsky, V.A. Teplyakov // PTE. 1970,
№2, p. 19.
2. I.M. Kapchinsky, V.A. Teplyakov // PTE. 1970,
№4, p. 17.
3. R.H. Stokes et al. RF Quadrupole beam dynamic //
IEEE Trans. 1979, NS-26, p. 3469.
4. V.O. Bomko, B.V. Zajtsev, E.V. Ivakhno,
A.P. Kobets, K.V. Pavlii, Z.E. Ptukhina, S.S. Tish-
kin. Accelerating structure with radio-frequency
quadrupole focusing RFQ for the heavy ions accel-
erating // Problems of Atomic Science and Technol-
ogy. Series “Nuclear Physics Investigations”. 2010,
№3(54), p. 26-30.
5. V.A. Bomko, B.V. Zajtsev, A.P. Kobets, et al.
Heavy Ions Beams Formation In An Initial Part of
Accelerating Structures Prestripping Section the
MILAC Linear Accelerator // Problems of Atomic
Science and Technology. Series «Nuclear Physics
Investigations». 2012, №4, p. 15-19.
6. V.O. Bomko, B.V. Zajtsev, A.P. Kobets, et al. Ac-
celerating structures pre-stripping section the
MILAC heavy ion linear accelerator MILAC //
Problems of Atomic Science and Technology. Series
“Nuclear Physics Investigations”. 2012, №4, p. 20-
23.
7. V.O. Bomko, A.P. Kobets, V.V. Panov, et al. Mod-
ernization of an initial part the MILAC // Proceed-
ing of RUPAC 2012. Sant-Petersburg. 2012, p. 466-
468.
8. V.A. Bomko, E.V. Ivakhno // Nucl. Instrum. and
Meth. in Ph. Res, Section A 582. 2007, р. 354-377.
9. V.O. Bomko, O.F. Dyachenko, A.P. Kobets, et al.
Adjustment of a new pre-stripping section the mul-
ticharge ion linear accelerator (MILAC) // Proc. In-
ternational Conf. EPAC08, Genoa, Italy, June 23-27,
2008, p. 3410-3412.
10. V.O. Bomko, O.F. Dyachenko, A.V. Pipa. Resonant
systems for adjustment accelerating structure type Н
// Problems of Atomic Science and Technology. Se-
ries “Technics of Physical Experiment”. 1981, №3,
p. 28.
Article received 31.01.2014
ОПТИМИЗАЦИЯ ПАРАМЕТРОВ УЧАСТКА УСКОРЯЮЩЕЙ СТРУКТУРЫ С ТРУБКАМИ
ДРЕЙФА ПРЕДОБДИРОЧНОЙ СЕКЦИИ ЛИНЕЙНОГО УСКОРИТЕЛЯ ЛУМЗИ
В.А. Бомко, Б.В. Зайцев, А.Ф. Кобец, Ю.В. Мелешкова
Продолжены исследования по оптимизации параметров участка ускоряющей структуры с трубками
дрейфа предобдирочной секции ПОС-20 для ускорения тяжёлых ионов с отношением их массы к заряду
A/q≤20. На втором участке ускорения ионов от 150 кэВ/нукл. до 1 МэВ/нукл. наиболее высокий темп уско-
рения создаёт встречно-штыревая ускоряющая Н-структура с трубками дрейфа. Радиально-фазовая устой-
чивость ускоренного пучка ионов обеспечивается комбинацией переменно-фазовой фокусировки с модифи-
кацией высокочастотной фокусировки.
ОПТИМІЗАЦІЯ ПАРАМЕТРІВ ДІЛЯНКИ ПРИСКОРЮЮЧОЇ СТРУКТУРИ З ТРУБКАМИ
ДРЕЙФУ ПЕРЕДОБДИРКОВОЇ СЕКЦІЇ ЛІНІЙНОГО ПРИСКОРЮВАЧА ЛУМЗІ
В.О. Бомко, Б.В. Зайцев, А.П. Кобець, Ю.В. Мелешкова
Продовжені дослідження з оптимізації параметрів ділянки прискорюючої структури із трубками дрейфу
передобдиркової секції ПОС-20 для прискорення важких іонів з відношенням їх маси до заряду A/q≤20. На
другій ділянці прискорення іонів від 150 кеВ/нукл. до 1 МеВ/нукл. найбільш високий темп прискорення
створює зустрічно-штирьова прискорююча Н-структура із трубками дрейфу. Радіально-фазова стійкість
прискореного пучка іонів забезпечується комбінацією перемінно-фазового фокусування з модифікацією ви-
сокочастотного фокусування.
INTRODUCTION
ACCELERATING STRUCTURE OF SITE WITH DRIFT TUBES PRESTRIPPING SECTION PSS-20
PROCEDURE AND DEVICES OF ADJUSTMENT OF ACCELERATING STRUCTURE
CONCLUSIONS
references
ОПТИМИЗАЦИЯ ПАРАМЕТРОВ УЧАСТКА УСКОРЯЮЩЕЙ СТРУКТУРЫ С ТРУБКАМИ ДРЕЙФА ПРЕДОБДИРОЧНОЙ СЕКЦИИ ЛИНЕЙНОГО УСКОРИТЕЛЯ ЛУМЗИ
ОПТИМІЗАЦІЯ параметрів ділянки прискорюючої структури з трубками дрейфу передобдиркової секції лінійного прИскорювача лумзі
|