RF system of the race-track microtron – recuperator for high power free electron laser
A brief description of the RF system of 100 MeV race-track microtron-recuperator being built in Novosibirsk for the Free Electron Laser project at Siberian center of Photochemistry research is presented. The frequency of RF system is 180.4 MHz. The RF system consists of 2 parts: the RF system of 2 M...
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| Опубліковано в: : | Вопросы атомной науки и техники |
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| Дата: | 2001 |
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України
2001
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | RF system of the race-track microtron – recuperator for high power free electron laser / V.S. Arbusov, A.S. Bushuev, V.N. Volkov, N.G. Gavrilov, E.I. Gorniker, E.K. Kenjebulatov, A.A. Kondakov, S.A. Krutikhin, Ya.G. Kruchkov, I.V. Kuptsov, G.Ya. Kurkin, V.Yu. Loskutov, L.A. Mironenko, S.V. Motygin, V.N. Osipov, V.M. Petrov, A.M. Pilan, I.K. Sedlyarov, A.G. Tribendis, N.G. Fomin // Вопросы атомной науки и техники. — 2001. — № 3. — С. 89-91. — Бібліогр.: 6 назв. — англ. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1859801388143345664 |
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| author | Arbusov, V.S. Bushuev, A.S. Volkov, V.N. Gavrilov, N.G. Gorniker, E.I. Kenjebulatov, E.K. Kondakov, A.A. Krutikhin, S.A. Kruchkov, Ya.G. Kuptsov, I.V. Kurkin, G.Ya. Loskutov, V.Yu. Mironenko, L.A. Motygin, S.V. Osipov, V.N. Petrov, V.M. Pilan, A.M. Sedlyarov, I.K. Tribendis, A.G. Fomin, N.G. |
| author_facet | Arbusov, V.S. Bushuev, A.S. Volkov, V.N. Gavrilov, N.G. Gorniker, E.I. Kenjebulatov, E.K. Kondakov, A.A. Krutikhin, S.A. Kruchkov, Ya.G. Kuptsov, I.V. Kurkin, G.Ya. Loskutov, V.Yu. Mironenko, L.A. Motygin, S.V. Osipov, V.N. Petrov, V.M. Pilan, A.M. Sedlyarov, I.K. Tribendis, A.G. Fomin, N.G. |
| citation_txt | RF system of the race-track microtron – recuperator for high power free electron laser / V.S. Arbusov, A.S. Bushuev, V.N. Volkov, N.G. Gavrilov, E.I. Gorniker, E.K. Kenjebulatov, A.A. Kondakov, S.A. Krutikhin, Ya.G. Kruchkov, I.V. Kuptsov, G.Ya. Kurkin, V.Yu. Loskutov, L.A. Mironenko, S.V. Motygin, V.N. Osipov, V.M. Petrov, A.M. Pilan, I.K. Sedlyarov, A.G. Tribendis, N.G. Fomin // Вопросы атомной науки и техники. — 2001. — № 3. — С. 89-91. — Бібліогр.: 6 назв. — англ. |
| collection | DSpace DC |
| container_title | Вопросы атомной науки и техники |
| description | A brief description of the RF system of 100 MeV race-track microtron-recuperator being built in Novosibirsk for the Free Electron Laser project at Siberian center of Photochemistry research is presented. The frequency of RF system is 180.4 MHz. The RF system consists of 2 parts: the RF system of 2 MeV injector and the RF system of microtron. The injector RF system includes 3 RF cavities - one buncher cavity and two accelerating cavities. RF cavities are driven by a 2.5 kW amplifier and two high power single-tube 130 kW RF amplifiers respectively. The RF system of microtron includes 16 RF cavities operating at a gap voltage of 850kV each. Two 4-tubes power amplifiers supply the RF power of 600 kW each to the cavities via distribution feeders. In the high power amplifier stages the tetrodes GU-101A are used. The control system controls the amplitude and phase of RF voltage in the cavities and provides signals for synchronization of the electron gun. The results of the operation of the injector RF system and status of large RF system for the microtron are discussed.
|
| first_indexed | 2025-12-07T15:12:42Z |
| format | Article |
| fulltext |
RF SYSTEM OF THE RACE-TRACK MICROTRON – RECUPERATOR
FOR HIGH POWER FREE ELECTRON LASER
V.S. Arbusov, A.S. Bushuev, V.N. Volkov, N.G. Gavrilov, E.I. Gorniker,
E.K. Kenjebulatov, A.A. Kondakov, S.A. Krutikhin, Ya.G. Kruchkov, I.V. Kuptsov,
G.Ya. Kurkin, V.Yu. Loskutov, L.A. Mironenko, S.V. Motygin, V.N. Osipov,
V.M. Petrov, A.M. Pilan, I.K. Sedlyarov, A.G. Tribendis, N.G. Fomin
Budker Institute of Nuclear Physics
630090 Novosibirsk, Russia, Lavrentyev Ave. 11
A brief description of the RF system of 100 MeV race-track microtron-recuperator being built in Novosibirsk for the
Free Electron Laser project at Siberian center of Photochemistry research is presented. The frequency of RF system
is 180.4 MHz.
The RF system consists of 2 parts: the RF system of 2 MeV injector and the RF system of microtron. The injector
RF system includes 3 RF cavities - one buncher cavity and two accelerating cavities. RF cavities are driven by a
2.5 kW amplifier and two high power single-tube 130 kW RF amplifiers respectively. The RF system of microtron
includes 16 RF cavities operating at a gap voltage of 850kV each. Two 4-tubes power amplifiers supply the RF
power of 600 kW each to the cavities via distribution feeders. In the high power amplifier stages the tetrodes
GU-101A are used.
The control system controls the amplitude and phase of RF voltage in the cavities and provides signals for synchro-
nization of the electron gun. The results of the operation of the injector RF system and status of large RF system for
the microtron are discussed.
PACS numbers: 41.60.Cr
1 INTRODUCTION
The project of high power FEL [1] calls for a con-
struction of eight-turns 100 MeV racetrack microtron
with average current up to 50 mA. The general scheme
of the RF system is shown in Fig.1. The buncher cavity
(4) is fed with RF power by 2.5 kW RF generator (5).
The two accelerating cavities (7) are fed by two 130 kW
generators (6). The 16 accelerating cavities of microtron
(3) are driven by two generators (1) with total output
power of 1.1 MW, which is limited by the existing an-
ode power supply.
Fig. 1. General scheme of RF system for the race–
track microtron–recuperator.
2 RF CAVITIES
The design of the accelerating cavities is described
in [2] in details. The shells of cavities are made from
bimetal (copper cladded stainless steel sheets, 8 mm of
cooper and 7 mm of stainless steel), produced by diffu-
sion welding. The cavity is cooled by water, the water
cooling channels being made in the stainless steel only.
The sketch of 2-cavity section is shown in Fig. 2. Each
resonant cavity is equipped with 2 contactless plunger
tuners (2) for the fundamental mode tuning and two
HOM tuners (3). The coaxial power input coupler (1)
with cylindrical ceramic window is placed on top of the
cavity. Before the installation in the cavity each input
coupler is tested on a special test bench up to the RF
voltage equivalent to 400kW in travelling wave mode.
A sampling loop (4) is used to measure the operating
gap voltage. An ion vacuum pump (5) is mounted to the
cavity bottom.
Fig. 2. Sketch of the RF cavity.
The parameters of the fundamental E010-like mode
are given in Table 1.
ВОПРОСЫ АТОМНОЙ НАУКИ И ТЕХНИКИ. 2001. №3.
Серия: Ядерно-физические исследования (38), с. 89-91.
89
After the assembly of the cavity, parameters of the
fundamental and higher order modes are measured on a
special stand [3]. The frequencies and Q-factors of the
cavity modes up to 1500 MHz are measured for differ-
ent positions of the tuners. The HOM tuners shift the
resonant frequencies of the higher order modes, while
their influence on the fundamental mode is rather weak.
A bead-pull measurements are carried out to study the
distribution of electric field along the cavity axis and to
calculate the R/Q values. Based on the measurement
data, the HOM tuners may be set to the positions corre-
sponding to the weak interaction between the electron
bunch and higher order modes.
Table 1. The parameters of the accelerating cavity
Resonant frequency f0 180.4 MHz
Tuning range ∆ f0 320 kHz
Quality factor Q0 40000
Shunt impedance R=U2/2P 5.3 MOhm
R/Q value ρ 133.5 Ohm
Gap voltage U 0-950 kV
Dissipated power at
U=950 kV
P 85 kW
After completion of the measurements, the two reso-
nant cavities are assembled into a section, which is
evacuated and baked in a furnace at 300°C. The vacuum
in the cavity after baking is better than 10-7Pa. Before
the installation in the microtron accelerating string, all
the cavities are tested at high CW RF power on a special
stand to process away multipacting. The cavity on the
test stand is driven by one of the injector generators.
The cavity is tested up to 1100 kV gap voltage.
The cavity is designed so that the fundamental mode
resonant frequency shift due to the RF heating of the
cavity walls is quite small. The change of frequency is
only about 10 kHz when the gap voltage changes from
100 kV to 900 kV.
3 RF GENERATORS
High power CW RF generators [4] were developed
and produced at BINP. The generators have a modular
design.
Anode rectifier (8 kV, 320 A) was developed and
produced at BINP too. Anode rectifier has a protection
system for a quick (50 microsec) switching-off the an-
ode voltage if breakdown occurs.
There are two generators with output RF power up
to 600 kW each. Each generator consists of four stages
(fig.3). First and second preliminary stages (4) are real-
ized on basis of the tube GU-92A. Third preliminary
stage (5) is performed on basis of one-tube module with
GU-101A. Output four-tube module stage (6) combines
the power from four tubes GU-101A.
Two generators with one-tube module output stages
with GU-101A operate at the RF system of the injector
of microtron-recuperator.
The GU-101A and GU-92A tetrodes are produced at
SVETLANA, St. Petersburg.
The system for dividing RF power between the ac-
celerating cavities (1) consists of the rectangular waveg-
uide (3) and of the coaxial lines (2) connected to the in-
puts of the cavities.
The accelerating cavities are divided into two
groups. Each group consists of 8 cavities and is connect-
ed to its waveguide.
The scheme of one 600 kW channel is shown in
Fig 3 too. The waveguide has cross-section
958 × 415 mm.
Fig. 3. 8-Cavities channel of RF system of microtron.
The RF cavities, driven by a single RF power
source, are located at a distance of one free-space wave-
length (1662 mm) from each other. Coaxial lines con-
nect cavities with a rectangular waveguide, which is
used as a power distribution unit. Waveguide dimen-
sions are chosen so that the waveguide wavelength
equals to two free-space wavelengths. Therefore, the
coax-to-waveguide transitions (2) are spaced by each
half of the guide wave length.
Each cavity has a main coupler of a loop type. It is
connected to the waveguide with a short coaxial line us-
ing a coax-to-waveguide transition, which is placed near
a small sidewall of the waveguide. The lengths of all
coaxial lines are equal. For obtaining the right phasing
of cavity fields, the main coupling loops in the neigh-
boring cavities of a group are rotated by 180°.
Power distribution along the cavity chain is propor-
tional to the distribution of cavity shunt impedances. If
the shunt impedances and tunes of the cavities are equal,
the driving powers are also equal. Matching of the di-
viding waveguide is performed with inductance stub in
waveguide.
90
4 CONTROL SYSTEM
The control electronics controls the amplitude of ac-
celerating RF voltage and performs phasing of the RF
generators with RF system of the Injector. RF voltages
of both RF generators are controlled independently and
both channels have the same design.
There is a feedback loop to control amplitude of ac-
celerating voltage. The sum of DC voltages from ampli-
tude detectors of RF cavities sampling signals are com-
pared with the reference DC voltage from DAC by
means of an operational amplifier. Output of the opera-
tional amplifier controls gain of a stage of the RF gener-
ator.
RF voltages of the cavities which are connected to
one RF generator are phased mutually by a proper de-
sign of the RF power distribution system. In this case
the error of mutual phasing of RF voltages of the chan-
nel is determined by error of the cavities tuners.
An RF signal, representing the total voltage seen by
the beam when crossing the 8 cavities driven by a com-
mon RF generator, is synthesized from the sampling
signals of each cavity and used for phasing of RF volt-
age of each RF channel to the Injector. A phase meter
compares this synthesized signal with the common ref-
erence RF signal of RF System. Output of the phase me-
ter controls a phase shifter in one stage of the RF gener-
ator. For initial phase setting a manually controlled
phase shifter is used which is placed between the RF
reference voltage source and the phase meter.
5 UP TO DATE STATUS
The injector has been operated at beam current of
45 mA and the energy of the accelerated electrons of
2MeV. The buncher cavity was operated at the gap volt-
age of 100 kV, and the accelerating cavities - at 770 kV
each. The power, transferred to the beam in the acceler-
ating cavities was 31.5 kW. More detailed description of
the injector and the results of its operation are given in
[6].
All the 16 cavities (8 sections) are already installed
into the microtron. The two generators for them (2×
600 kW) are placed in separate room. The tests of the
entire RF system will be performed after the completion
of assembling of the waveguide – coaxial power distri-
bution system.
The power RF generator, analogous to the ones built
for the microtron, were tested in the RF system of
VEPP-4 collider. The output power of 500 kW and effi-
ciency of 53% for the output stage were achieved.
REFERENCES
1. B.Baklakov et al. Status of FEL project for Siberian
center of Photochemistry research // Proc. of XIII
Russion conference on SR applications, July 17-21
2000, Novosibirsk, Proceedins of conference,
p. 24-29.
2. N.Gavrilov et al. RF Cavity for the Novosibirsk
Race-Track Microtron-Recuperator, preprint 94-92
of Budker INP of Siberian Branch of Russian
Academy of Sciences, Novosibirsk, 1994.
3. E.Kenjebulatov et al. Setup for Measuring RF
Characteristics of Accelerating Cavities // Proceed-
ings of XVII International Conference on High En-
ergy Accelerators, September 7-12, 1998, Dubna,
Russia, p. 131-133.
4. V.Arbuzov et al. High Power Module Design RF
generator for Storage Rings and Accelerators //
Proc. of XVI Conference on Charged Particles Ac-
celerators, October 1998, Protvino.
5. B.Baklakov et al. The 8kV Power Supply for RF
Generators Anode Feeding // Proc. of XVII Interna-
tional Conference on High Energy Accelerators,
1998, Dubna, Russia.
6. V.Arbuzov et al. RF System of Electron Injector for
the Race-Track Microtron-Recuperator and Results
of its Operation with Electron Beam // Problems of
Atomic Science and Technology. Issue: Nuclear-
Physics Research (35). 1999, # 4, p. 26-28.
90
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| id | nasplib_isofts_kiev_ua-123456789-79216 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 1562-6016 |
| language | English |
| last_indexed | 2025-12-07T15:12:42Z |
| publishDate | 2001 |
| publisher | Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| record_format | dspace |
| spelling | Arbusov, V.S. Bushuev, A.S. Volkov, V.N. Gavrilov, N.G. Gorniker, E.I. Kenjebulatov, E.K. Kondakov, A.A. Krutikhin, S.A. Kruchkov, Ya.G. Kuptsov, I.V. Kurkin, G.Ya. Loskutov, V.Yu. Mironenko, L.A. Motygin, S.V. Osipov, V.N. Petrov, V.M. Pilan, A.M. Sedlyarov, I.K. Tribendis, A.G. Fomin, N.G. 2015-03-30T06:18:55Z 2015-03-30T06:18:55Z 2001 RF system of the race-track microtron – recuperator for high power free electron laser / V.S. Arbusov, A.S. Bushuev, V.N. Volkov, N.G. Gavrilov, E.I. Gorniker, E.K. Kenjebulatov, A.A. Kondakov, S.A. Krutikhin, Ya.G. Kruchkov, I.V. Kuptsov, G.Ya. Kurkin, V.Yu. Loskutov, L.A. Mironenko, S.V. Motygin, V.N. Osipov, V.M. Petrov, A.M. Pilan, I.K. Sedlyarov, A.G. Tribendis, N.G. Fomin // Вопросы атомной науки и техники. — 2001. — № 3. — С. 89-91. — Бібліогр.: 6 назв. — англ. 1562-6016 PACS numbers: 41.60.Cr https://nasplib.isofts.kiev.ua/handle/123456789/79216 A brief description of the RF system of 100 MeV race-track microtron-recuperator being built in Novosibirsk for the Free Electron Laser project at Siberian center of Photochemistry research is presented. The frequency of RF system is 180.4 MHz. The RF system consists of 2 parts: the RF system of 2 MeV injector and the RF system of microtron. The injector RF system includes 3 RF cavities - one buncher cavity and two accelerating cavities. RF cavities are driven by a 2.5 kW amplifier and two high power single-tube 130 kW RF amplifiers respectively. The RF system of microtron includes 16 RF cavities operating at a gap voltage of 850kV each. Two 4-tubes power amplifiers supply the RF power of 600 kW each to the cavities via distribution feeders. In the high power amplifier stages the tetrodes GU-101A are used. The control system controls the amplitude and phase of RF voltage in the cavities and provides signals for synchronization of the electron gun. The results of the operation of the injector RF system and status of large RF system for the microtron are discussed. en Національний науковий центр «Харківський фізико-технічний інститут» НАН України Вопросы атомной науки и техники RF system of the race-track microtron – recuperator for high power free electron laser ВЧ система разрезного микротрона-рекуператора для мощного лазера на свободных электронах Article published earlier |
| spellingShingle | RF system of the race-track microtron – recuperator for high power free electron laser Arbusov, V.S. Bushuev, A.S. Volkov, V.N. Gavrilov, N.G. Gorniker, E.I. Kenjebulatov, E.K. Kondakov, A.A. Krutikhin, S.A. Kruchkov, Ya.G. Kuptsov, I.V. Kurkin, G.Ya. Loskutov, V.Yu. Mironenko, L.A. Motygin, S.V. Osipov, V.N. Petrov, V.M. Pilan, A.M. Sedlyarov, I.K. Tribendis, A.G. Fomin, N.G. |
| title | RF system of the race-track microtron – recuperator for high power free electron laser |
| title_alt | ВЧ система разрезного микротрона-рекуператора для мощного лазера на свободных электронах |
| title_full | RF system of the race-track microtron – recuperator for high power free electron laser |
| title_fullStr | RF system of the race-track microtron – recuperator for high power free electron laser |
| title_full_unstemmed | RF system of the race-track microtron – recuperator for high power free electron laser |
| title_short | RF system of the race-track microtron – recuperator for high power free electron laser |
| title_sort | rf system of the race-track microtron – recuperator for high power free electron laser |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/79216 |
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