Progress in 433 MHz RFQ technology at NPK LUTS NIIEFA
The paper is a survey of progress in 433 MHz RFQ technology at Production Complex of Linacs and Cyclotrons of D.V. Efremov Institute Sci. over past three years. RFQs and APF-cavities are designed as bases for ion accelerators for different applications. The use of 433 MHz frequency determines high...
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України
2006
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| Цитувати: | Progress in 433 MHz RFQ technology at NPK LUTS NIIEFA / Yu.A. Svistunov, M.F. Vorogushin, Yu.N. Gavrish, A.A. Budtov, P.V. Bogdanov, V.A. Ershov, V.I. Grigoriev, A.K. Liverovski, V.G. Mudrolubov, V.I. Petrov, S.A. Silaev, A.P. Strokach, V.F. Tsvetkov // Вопросы атомной науки и техники. — 2006. — № 3. — С. 69-71. — Бібліогр.: 1 назв. — англ. |
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irk-123456789-793052015-03-31T03:02:31Z Progress in 433 MHz RFQ technology at NPK LUTS NIIEFA Svistunov, Yu.A. Vorogushin, M.F. Gavrish, Yu.N. Budtov, A.A. Bogdanov, P.V. Ershov, V.A. Grigoriev, V.I. Liverovski, A.K. Mudrolubov, V.G. Petrov, V.I. Silaev, S.A. Strokach, A.P. Tsvetkov, V.F. Ускорители заряженных частиц The paper is a survey of progress in 433 MHz RFQ technology at Production Complex of Linacs and Cyclotrons of D.V. Efremov Institute Sci. over past three years. RFQs and APF-cavities are designed as bases for ion accelerators for different applications. The use of 433 MHz frequency determines high requirements for RFQ manufacture facilities, which are discussed herein. The test experimental results of RFQ full-scale stands and high power rf testing data under beam load of 1 MeV on a deuteron RFQ made of chromium copper are presented. Приведен обзор работ по созданию ПОКФ на 433 МГц в НПК ЛУЦ НИИЭФА им. Д.В. Ефремова за последние три года. ПОКФ и ПФФ-резонаторы планируется использовать в качестве основных резонаторов ускорителей ионов для различных применений. Использование частоты 433 МГц определяет высокие требования для изготовления ПОКФ, которые обсуждены в статье. Представлены экспериментальные результаты тестирования полномасштабных стендов ПОКФ и данные испытаний резонатора из хромистой меди для ускорения дейтронов до энергии 1 МэВ при высоком уровне ВЧ-мощности и нагрузке пучком. Наведено огляд робіт зі створення ПОКФ на 433 МГц у НПК ЛУЦ НІІЕФА ім. Д.В. Єфремова за останні три роки. ПОКФ і ЗФФ-резонатори планується використати як основні резонатори прискорювачів іонів для різних застосувань. Використання частоти 433 МГц визначає високі вимоги для виготовлення ПОКФ, які обговорені в статті. Представлено експериментальні результати тестування повномасштабних стендів ПОКФ і дані випробувань резонатора із хромистої міді для прискорення дейтронів до енергії 1 МеВ при високому рівні ВЧ-потужності і навантаженню пучком. 2006 Article Progress in 433 MHz RFQ technology at NPK LUTS NIIEFA / Yu.A. Svistunov, M.F. Vorogushin, Yu.N. Gavrish, A.A. Budtov, P.V. Bogdanov, V.A. Ershov, V.I. Grigoriev, A.K. Liverovski, V.G. Mudrolubov, V.I. Petrov, S.A. Silaev, A.P. Strokach, V.F. Tsvetkov // Вопросы атомной науки и техники. — 2006. — № 3. — С. 69-71. — Бібліогр.: 1 назв. — англ. 1562-6016 PACS: 27.17.+w http://dspace.nbuv.gov.ua/handle/123456789/79305 en Вопросы атомной науки и техники Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| language |
English |
| topic |
Ускорители заряженных частиц Ускорители заряженных частиц |
| spellingShingle |
Ускорители заряженных частиц Ускорители заряженных частиц Svistunov, Yu.A. Vorogushin, M.F. Gavrish, Yu.N. Budtov, A.A. Bogdanov, P.V. Ershov, V.A. Grigoriev, V.I. Liverovski, A.K. Mudrolubov, V.G. Petrov, V.I. Silaev, S.A. Strokach, A.P. Tsvetkov, V.F. Progress in 433 MHz RFQ technology at NPK LUTS NIIEFA Вопросы атомной науки и техники |
| description |
The paper is a survey of progress in 433 MHz RFQ technology at Production Complex of Linacs and Cyclotrons
of D.V. Efremov Institute Sci. over past three years. RFQs and APF-cavities are designed as bases for ion accelerators
for different applications. The use of 433 MHz frequency determines high requirements for RFQ manufacture
facilities, which are discussed herein. The test experimental results of RFQ full-scale stands and high power rf testing
data under beam load of 1 MeV on a deuteron RFQ made of chromium copper are presented. |
| format |
Article |
| author |
Svistunov, Yu.A. Vorogushin, M.F. Gavrish, Yu.N. Budtov, A.A. Bogdanov, P.V. Ershov, V.A. Grigoriev, V.I. Liverovski, A.K. Mudrolubov, V.G. Petrov, V.I. Silaev, S.A. Strokach, A.P. Tsvetkov, V.F. |
| author_facet |
Svistunov, Yu.A. Vorogushin, M.F. Gavrish, Yu.N. Budtov, A.A. Bogdanov, P.V. Ershov, V.A. Grigoriev, V.I. Liverovski, A.K. Mudrolubov, V.G. Petrov, V.I. Silaev, S.A. Strokach, A.P. Tsvetkov, V.F. |
| author_sort |
Svistunov, Yu.A. |
| title |
Progress in 433 MHz RFQ technology at NPK LUTS NIIEFA |
| title_short |
Progress in 433 MHz RFQ technology at NPK LUTS NIIEFA |
| title_full |
Progress in 433 MHz RFQ technology at NPK LUTS NIIEFA |
| title_fullStr |
Progress in 433 MHz RFQ technology at NPK LUTS NIIEFA |
| title_full_unstemmed |
Progress in 433 MHz RFQ technology at NPK LUTS NIIEFA |
| title_sort |
progress in 433 mhz rfq technology at npk luts niiefa |
| publisher |
Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| publishDate |
2006 |
| topic_facet |
Ускорители заряженных частиц |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/79305 |
| citation_txt |
Progress in 433 MHz RFQ technology at NPK LUTS NIIEFA / Yu.A. Svistunov, M.F. Vorogushin, Yu.N. Gavrish, A.A. Budtov, P.V. Bogdanov, V.A. Ershov,
V.I. Grigoriev, A.K. Liverovski, V.G. Mudrolubov, V.I. Petrov,
S.A. Silaev, A.P. Strokach, V.F. Tsvetkov // Вопросы атомной науки и техники. — 2006. — № 3. — С. 69-71. — Бібліогр.: 1 назв. — англ. |
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Вопросы атомной науки и техники |
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PROGRESS IN 433 MHz RFQ TECHNOLOGY AT NPK LUTS NIIEFA
Yu.A. Svistunov, M.F. Vorogushin, Yu.N. Gavrish, A.A. Budtov, P.V. Bogdanov, V.A. Er-
shov, V.I. Grigoriev, A.K. Liverovski, V.G. Mudrolubov, V.I. Petrov,
S.A. Silaev, A.P. Strokach, V.F. Tsvetkov
D.V.Efremov Sci. Res. Institute, Saint-Petersburg, 196641, Russia
V.M. Maximov
Department of Atomic Science and Technology, Moscow, 101000, Russia
The paper is a survey of progress in 433 MHz RFQ technology at Production Complex of Linacs and Cyclotrons
of D.V. Efremov Institute Sci. over past three years. RFQs and APF-cavities are designed as bases for ion accelera-
tors for different applications. The use of 433 MHz frequency determines high requirements for RFQ manufacture
facilities, which are discussed herein. The test experimental results of RFQ full-scale stands and high power rf test-
ing data under beam load of 1 MeV on a deuteron RFQ made of chromium copper are presented.
PACS: 27.17.+w
INTRODUCTION
NPK LUTS NIIEFA plans for designing ion-linacs-
based accelerating complexes for applied purposes to-
gether with first experimental results of a 433 MHz-fre-
quency accelerating facility were presented at several
international conferences (see, for example, [1] and ref-
erences therein). The paper [1] is devoted to the use of
accelerated protons and deuterons with an energy from
1 up to 15 MeV in medical isotope production, elemen-
tal analysis of materials and other special purposes.
It is proposed to use RFQ for deuteron and proton
acceleration up to 4 MeV and H-resonators with APF
for acceleration from 2 up to 15 MeV. Concurrently
with accelerating system elements designing, R&D was
performed into an injection system, a feed (rf) system
and also into output units and information processing
systems in case of a complex of explosive and fissible
substances. The research is supported by Ministry of
Atomic Energy of Russian Federation.
ACCELERATING STRUCTURES
As it was expected, difficulties appeared with pro-
duction of accelerating structures on a chosen working
frequency. Analytical estimation, numerical simulation
and testing full-scale prototypes fabricated of AMG-6
and D-16 aluminium alloys showed that at a working
frequency of 433 MHz manufacturing tolerances for in-
tervane distance in the chosen construction (four-cham-
ber RFQ) must be ±25 mkm for neighboring vanes and
±35 mkm for opposite vanes in plane of symmetry for
all accelerating cells. It comes to requirements of mi-
cron tolerances for linear dimensions and construction
parameters determining deviations from nominal inter-
vane distance values. An accuracy of production of vane
modulation and its positioning relative to the plane of
vane beginning z = 0 must be not more than 3…4 mkm.
This requirement and requirements for inner surfaces
treatment not less that 10 class were not fully met while
fabricating the first chromium copper resonator with
RFQ for deuteron acceleration from 60 keV up to
1 MeV. As a result, after tuning, the field irregularity
was rather high (±7%). Another deficiency was an im-
perfection of gaskets for electric contact between vanes.
Therefore, the quality factor of the resonator was much
lower than the estimated value. RFQ designed values
and results of pilot experiment are given in the table.
RFQ designed characteristics and experiment results
Parameter Deuterons
(theory)
Pro-
tons
(theo-
ry)
Protons
(experi-
ment)
Input energy, MeV 0.06 0.03 0.03
Output energy, MeV 1 0.5 0.5
Energy spectrum
width, keV
±30 ±30 ±40
Intervane voltage, kV 98 49 49
Quality factor 8000 8000 4400
Pulse power, kW 310 77.5 215 (experi-
ment)
146 (theory)
Input pulse current,
mA
20 25 5
Output pulse current,
mA
15 18 1.3
Residual gas pressure,
Torr
(7...9)⋅10-7
Test stand of chromium copper RFQ is shown in
Fig.1. The tolerance requirements were satisfied at pro-
ducing the experimental structure of D-16 alloy for pro-
ton acceleration from 0.06 up to 1 MeV. General view
and cross-section of this structure are depicted in Fig.2
and 3, respectively.
CUTTING TOOL CHOICE
It is necessary to provide a low value of surface
roughness to except a high-frequency breakdown in
paraxial area where the breakdown is most probable
(not less than 10 class surface finish; Ra = 0.16 mkm);
the low roughness requirements for other surfaces are
coming from the necessity to provide oscillations high
quality factor value probable (not less than 10 class sur-
face finish; Ra = 0.16 mkm).
____________________________________________________________
PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY. 2006. № 3.
Series: Nuclear Physics Investigations (47), p.69-71. 69
Fig.1
Fig.2
r0
r1
h
α
r2
h0
Fig.. 3 Fig.3
Material processing with the use of a diamond cut-
ting tool gives an opportunity to solve two main prob-
lems: a) to provide low-level surface roughness
(12 class or Ra = 0.04 mkm) and, as a result, to obtain
cavity geometry with the required precision, b) the real-
ization of the long-life tool and material processing
without tool deterioration provide the accuracy of man-
ufacturing at micron and submicron levels.
Solving of these two problems allows fabricating the
vane docking interfaces with required accuracy.
Materials being processed by such diamond tools
were tested to meet RFQ production requirements. At
present, the selected materials are aluminium alloy D-16
and chromium copper one.
Examination of Talyrond trace made on a profilome-
ter showed a diamond miller having vertical oscillations
with an amplitude about 10 micron. Long surfaces pro-
cessing ~1500 mm also showed slow drift in vertical di-
rection.
Because a geometrical analysis of dimensional se-
quences had shown the necessity for a further design of
vane docking interfaces with nonflatness not worse than
2.5 micron at a length of 1500 mm and the accuracy of
size realization, forming dimensional sequences, being
not worse than 5 micron, an incompatibility of these re-
quirements with the existing range of oscillations of the
cutting tool was established. To eliminate this incompat-
ibility it was necessary to reduce the miller oscillation
range from 10 micron down to 1 micron.
CUTTING MODIFICATION AND CLIMATE
CONTROL FORMING
A graphical analysis of vertical oscillation (along
Z axis) measurements at Z coordinate being fixed with
the help of a standard machine metering system for a
period of time about 10 minutes (a cycle of 80 measure-
ments) showed the presence of a superposition of mea-
suring value deviations of three types: a jumping devia-
tion, a wavelike deviation and a slow drift of a value
measured.
Based on these results and on measurement results
obtained from standard temperature sensors of some
machine modules, a strategy to find dominant sources of
deviation was formed.
Investigations showed that:
• The jumping error is formed by an automatic cor-
rection of thermal deformations at the transversal
axis Z and Y and is regulated in a PLC controller
with a time of correction up to 5 seconds;
• The wavelike error is formed by temperature defor-
mations in machine modules due to oil thermal
fluctuations in machine hydrosystem in a cooling
unit under the PLC controller operating (oil temper-
ature full changing period is up to 5 minutes);
• The drift error is conditioned by machine modules’
thermal deformation caused by a temperature
change at the machine location (the temperature
change period makes more than 10 minutes).
70
The jumping error was eliminated by matching ap-
propriate parameters of the PLC controller.
The necessity to eliminate the wavelike error de-
manded a detail analysis of some machine modules and
systems that allowed bringing out operational schemes
for these modules and systems at hardware and software
level. The analysis of temperature diagrams for different
machine modules allowed making particular sugges-
tions about machine modules temperature stabilization.
The use of additional equipment permitted to optimize
the working timing cycle. Specifically, an external con-
trol operating scheme for compressor was suggested.
That allowed decreasing the coolant temperature range
fluctuation in the system from 5.3 C to 1.2 C and hence
lowering the wavelike error component from 2 mkm
down to 0.4 mkm along Z coordinate and from 2.8 mkm
down to 0.8 mkm along Y one.
In order to decrease a slow component of the error in
a form of a slope caused by temperature fluctuation and
consequent thermal machine deformations, two air con-
ditioners were placed on the right and left sides of the
machine. Different operation modes were tested. Based
on these tests, an attempt to find an optimal operation
mode was made. Basing on conditioners’ manual con-
trol experience it was made a decision to put an auto-
matic control system. That allowed stabilization of air
temperature within 0.25°C range in the vane seat place.
Also the stand site thermal insulation was improved. Es-
sential improvement in temperature stabilization near
the vane location was obtained by a shutter installation
around the carrying spindle column. Installation of the
liquid (spirituous) feeding system to the cutting area al-
lowed treatment purity and precision improvement.
These procedures permit measurements to be done
with accuracy 1.5 mkm within 10 minutes. At present,
the docking interfaces treatment precision at the length
1500 mm is 2.5 mkm along Z and Y coordinates
(Ra = 0.04 mkm or 12 class). Maximal difficulties with
experimental proton resonator of aluminium alloy arise
with the last processing of the inclined surfaces (10° and
45°). Processing result for the best vane has an error of
20 mkm (Ra = 0.15 mkm or 10 class). In future it is sup-
posed to develop and create a special equipment that
will realize a pneumatic pressing of a vane in manufac-
turing process.
CONCLUSION
Now, the measurement accuracy on the HS-328 ma-
chine can achieve 1 mkm. Nonflatness of vane docking
interface is decreased down to 2.5 mkm along Z and Y
coordinates instead of 10 mkm at the beginning.
After tuning and testing the experimental RFQ of
aluminium alloy, it is supposed to fabricate another pro-
ton RFQ of chromium copper. This RFQ is supposed to
accelerate particles from 0.06 to 2 MeV.
REFERENCES
1. M.F. Vorogushin, Yu.A. Svistunov. Key Systems of
a 433 MHz Ion Linac for Applied Purposes. Proc. of
LINAC 96. 1996, v.2, p.866.
ПРОГРЕСС В СОЗДАНИИ УСКОРЯЮЩИХ СТРУКТУР С ПОКФ
НА ЧАСТОТЕ 433 МГц В НПК ЛУЦ НИИЭФА
Ю.А. Свистунов, М.Ф. Ворогушин, Ю.Н. Гавриш, А.А. Будтов, П.В. Богданов, В.А. Ершов, В.И. Григо-
рьев, А.К. Ливеровский, В.Г. Мудролюбов, В.И. Петров, С.А. Силаев, А.П. Строкач, В.Ф. Цветков,
В.М. Максимов
Приведен обзор работ по созданию ПОКФ на 433 МГц в НПК ЛУЦ НИИЭФА им. Д.В. Ефремова за по-
следние три года. ПОКФ и ПФФ-резонаторы планируется использовать в качестве основных резонаторов
ускорителей ионов для различных применений. Использование частоты 433 МГц определяет высокие требо-
вания для изготовления ПОКФ, которые обсуждены в статье. Представлены экспериментальные результаты
тестирования полномасштабных стендов ПОКФ и данные испытаний резонатора из хромистой меди для
ускорения дейтронов до энергии 1 МэВ при высоком уровне ВЧ-мощности и нагрузке пучком.
ПРОГРЕС У СТВОРЕННІ ПРИСКОРЮВАЛЬНИХ СТРУКТУР З ПОКФ
НА ЧАСТОТІ 433 МГц У НПК ЛУЦ НІІЕФА
Ю.А. Свістунов, М.Ф. Ворогушин, Ю.Н. Гавриш, А.А. Будтов, П.В. Богданов, В.А. Єршов, В.І. Григорьєв,
А.К. Ліверовський, В.Г. Мудролюбов, В.І. Петров, С.А. Сілаєв, А.П. Строкач, В.Ф. Цветков,
В.М. Максімов
Наведено огляд робіт зі створення ПОКФ на 433 МГц у НПК ЛУЦ НІІЕФА ім. Д.В. Єфремова за останні
три роки. ПОКФ і ЗФФ-резонатори планується використати як основні резонатори прискорювачів іонів для
різних застосувань. Використання частоти 433 МГц визначає високі вимоги для виготовлення ПОКФ, які
обговорені в статті. Представлено експериментальні результати тестування повномасштабних стендів
ПОКФ і дані випробувань резонатора із хромистої міді для прискорення дейтронів до енергії 1 МеВ при
високому рівні ВЧ-потужності і навантаженню пучком.
____________________________________________________________
PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY. 2006. № 3.
Series: Nuclear Physics Investigations (47), p.69-71. 71
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