Self-exited generator system of RF-power supply of the one-section linear ion accelerator
The paper presents the block-diagram of a RF-power supply system of a single-section linear ion accelerator and the results of experiments on studying its mode of operation with changing the parameters of circuits of positive back couling of the radio-frequency (RF) amplifier channel.
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| Дата: | 2001 |
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| Формат: | Стаття |
| Мова: | English |
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України
2001
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| Назва видання: | Вопросы атомной науки и техники |
| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/79007 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Self-exited generator system of RF-power supply of the one-section linear ion accelerator / L.D. Lobzov, N.G. Shulika // Вопросы атомной науки и техники. — 2001. — № 5. — С. 157-159. — Бібліогр.: 6 назв. — англ. |
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irk-123456789-790072015-03-25T03:02:41Z Self-exited generator system of RF-power supply of the one-section linear ion accelerator Lobzov, L.D. Shulika, N.G. The paper presents the block-diagram of a RF-power supply system of a single-section linear ion accelerator and the results of experiments on studying its mode of operation with changing the parameters of circuits of positive back couling of the radio-frequency (RF) amplifier channel. 2001 Article Self-exited generator system of RF-power supply of the one-section linear ion accelerator / L.D. Lobzov, N.G. Shulika // Вопросы атомной науки и техники. — 2001. — № 5. — С. 157-159. — Бібліогр.: 6 назв. — англ. 1562-6016 PACS number: 29.17.+w http://dspace.nbuv.gov.ua/handle/123456789/79007 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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DSpace DC |
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English |
| description |
The paper presents the block-diagram of a RF-power supply system of a single-section linear ion accelerator and the results of experiments on studying its mode of operation with changing the parameters of circuits of positive back couling of the radio-frequency (RF) amplifier channel. |
| format |
Article |
| author |
Lobzov, L.D. Shulika, N.G. |
| spellingShingle |
Lobzov, L.D. Shulika, N.G. Self-exited generator system of RF-power supply of the one-section linear ion accelerator Вопросы атомной науки и техники |
| author_facet |
Lobzov, L.D. Shulika, N.G. |
| author_sort |
Lobzov, L.D. |
| title |
Self-exited generator system of RF-power supply of the one-section linear ion accelerator |
| title_short |
Self-exited generator system of RF-power supply of the one-section linear ion accelerator |
| title_full |
Self-exited generator system of RF-power supply of the one-section linear ion accelerator |
| title_fullStr |
Self-exited generator system of RF-power supply of the one-section linear ion accelerator |
| title_full_unstemmed |
Self-exited generator system of RF-power supply of the one-section linear ion accelerator |
| title_sort |
self-exited generator system of rf-power supply of the one-section linear ion accelerator |
| publisher |
Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| publishDate |
2001 |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/79007 |
| citation_txt |
Self-exited generator system of RF-power supply of the one-section linear ion accelerator / L.D. Lobzov, N.G. Shulika // Вопросы атомной науки и техники. — 2001. — № 5. — С. 157-159. — Бібліогр.: 6 назв. — англ. |
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Вопросы атомной науки и техники |
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AT lobzovld selfexitedgeneratorsystemofrfpowersupplyoftheonesectionlinearionaccelerator AT shulikang selfexitedgeneratorsystemofrfpowersupplyoftheonesectionlinearionaccelerator |
| first_indexed |
2025-07-06T03:08:07Z |
| last_indexed |
2025-07-06T03:08:07Z |
| _version_ |
1836865330167676928 |
| fulltext |
SELF-EXITED GENERATOR SYSTEM OF RF -POWER SUPPLY
OF THE ONE-SECTION LINEAR ION ACCELERATOR
L.D. Lobzov, N.G. Shulika
NSC KIPT, Kharkov, Ukraine
The paper presents the block-diagram of a RF-power supply system of a single-section linear ion accelerator and the
results of experiments on studying its mode of operation with changing the parameters of circuits of positive back
couling of the radio-frequency (RF) amplifier channel.
PACS number: 29.17.+w
The development of a high-stable self-exiting gener-
ator system of RF-power supply with a minimum num-
ber of amplifier stages for the accelerator MLUD-3,
when upgrading its accelerating structure [1], was dic-
tated by a number of advantages, which are considered
to be characteristic for self-excited oscillation systems
[2].
However, introduction of one positive back coupling
(any), for energization of the amplifier channel, during
correlation of the amplitude-phase relations in an self-
excited oscillator circuit, did not provide its steady oper-
ation, because of a multipactor action being developed
in the accelerator. Attempts to use the experts’ experi-
ence accumulated in the field of development of similar
systems [3] did not give the needed results because of
features inherent in accelerating structures with vari-
able-phase focusing on the comb-shaped holders of drift
tubes and operation at H- mode oscillation [4].
Fig. 1. Block diagram of the self-excited generator
of RF power supply of the single-section linear ion
accelerator.
1 – amplifier channel; 2 – loop of power supply;
3 - resonator; 4 – loop of the first positive back cou-
pling; 5 – loop of the second positive back coupling;
6 – summarizing device; 7 – attenuator; 8 - phase
changer; 9 – feeder commutator; 10 – feeder reflec-
tometer; 11 – resistance; 12 – measuring loop.
Usage of superpositions of two positive back cou-
pling (the loop of one of them is placed in the accelera-
tor resonator, and the loop of another is in the feeder of
a power at which induced is the voltage proportional to
the amplitude of an incident wave) allows to create a
self-excited generator system of the RF-power supply of
the accelerator effectively overcoming the multipactor
effects and providing the steady operation of the ampli-
fier channel and the accelerator in a whole [5, 6]. It is
explained by the fact, that the mode of self-excited gen-
eration in the second circuit does not depend on the pro-
cesses acting in the resonator, into which an appropriate
part of a power arrives, providing violation of multi-
pactor phenomena conditions.
This paper presents the results of investigations per-
formed at the accelerator MLUD-3, taking into account
the changes of some parameters of its self-excited gen-
erator system of RF-power supply.
The block-diagram of the self-excited generator sys-
tem of RF-power supply of the single-section linear ion
accelerator used for investigations is shown in Fig. 1.
The three-stage amplifier channel, with the amplifi-
cation factor (~100) chosen taking into account the pro-
vided amplitude relations of the self-excited generation
system, is covered by two positive back coupling, the
signals of which are controlled by continuous attenua-
tors and phase changers. The perturbation of accelerat-
ing fields entered into its resonator by a loop of positive
back coupling does not exceed the value 1%.
The control of power mode transmission into the ac-
celerator is made with measurement of a signal ampli-
tude from the resonator and with measurement of inci-
dent and back wave amplitudes, both in a power feeder,
and in circuits of positive back coupling.
The accelerator resonance frequency in a pulse mode
is measured with the help of the equipment, comprising
a frequency mixer, generator, frequency counter and os-
cillograph. The frequencies of self-excited oscillations
at each of circuits are determined by a frequency of a
high-Q resonator of the accelerator (Qres ≈ 5000). The
study of the influence of the first positive back coupling
(FPBC) and the second positive back coupling (SPBC)
circuits together with their loops, placed, in correspond-
ing points at a resonance frequency of the accelerator,
was conducted in the mode of "cold" measurements.
Within the accuracy of measurements ±5 kHz the reso-
nance frequency of the accelerator does not vary when
connecting both together, and separately the indicated
circuits, that is confirmed by the "weakness" of their in-
fluence on electrodynamics parameters of the accelera-
tor.
Study of the relation of amplitudes of FPBC and
ВОПРОСЫ АТОМНОЙ НАУКИ И ТЕХНИКИ. 2001. №5.
Серия: Ядерно-физические исследования (39), с. 157-159.
157
SPBC signals in an operation mode of the accelerator
have allowed to install the value of a SPBC signal in
limits (0.1÷0.3) of the first positive back coupling am-
plitude, when simultaneously a high-stability operation
of the accelerator is provided, and the value of an accel-
erating field is determined by a signal amplitude from
the resonator.
In the plots (Fig. 2-Fig. 5) shown are the dependen-
cies of basic parametres of the accelerator for changing,
in limits ±90°, the phase of positive back coupling of
one of circuits, while another circuit has an optimum
phase tuning.
Fig. 2. Voltage amplitude of incident and back
waves in feeder power supply as a function of back
coupling signal phases: 1 – Uinc = f(ϕFPBC); 2 - Uinc =
f(ϕSPBC); 3 – Uback = f(ϕFPBC); 4 - Uback = f(ϕSPBC).
Fig. 3. Voltage amplitude with resonator measuring
loop as a function of back coupling phases:
1 - Ures = f(ϕFPBC); 2 – Ures = f(ϕSPBC).
From the dependencies observed it follows that the
required parameters of the accelerator describing the
mode of matched power transmission into the accelera-
tor, are supported by phase control in circuits of positive
back couplings in limits (1÷2)°. The change of the
matching degree is controlled by the back wave ampli-
tude in a power feeder and together with measurements
of basic parameters determines the operation mode of
the accelerator.
Fig. 4. Voltage standing wave rate in feeder power
supply as a function of back coupling signal phases:
1 – SWR = f(ϕFPBC); 2 – SWR nc = f(ϕSPBC).
Fig. 5. Basic frequency of the resonator accelerator
as a function of back coupling signal phases:
1 - Fres = f(ϕFPBC); 2 – Fres = f(ϕSPBC).
The present research allows one to determine the re-
quirements for design of automatic controls stabilizing
the amplitude and accelerating field phase in the accel-
erator, that will facilitate the maintenance of the acceler-
ator and essentially will increase the reliability of its op-
eration.
REFERENCES
1. A.S.Beley et al. Project of upgrading the accelerat-
158
ing structure of a small-size linear deuton accelera-
tor // Voprosy atomnoj Nauki i Tekhniki. Ser.:
Tekhnika fizicheskogo ehksperimenta. (35). 1987,
v. 4, p. 8 (in Russian).
2. Linear Ion Accelerators. v. 2 / Edited by B.P.-
Murin, Moscow, Atomizdat, 1978, 144 p. (in Rus-
sian).
3. V.A.Popov. System of radio-frequency excitation of
JINR LU-20 Synchrotron. Preprint 9-11835, DUB-
NA, 1978.
4. L.N.Baranov et al. Experimental research of the
small-sized linear accelerator of the 3 MeV deuton
energy 3 MeV with variable-phase focusing // Vo-
prosy atomnoj Nauki i Tekhniki. Ser.; Linejnye
uskoriteli (5). 1977, v. 2, p. 12 (in Russian).
5. L.D.Lobzov et al. Radio-frequency self-excited
generator. License SU N1700783 A1, Bull. of in-
vention N 47, 1991, p. 239 (in Russian).
6. L.D.Lobzov et al. RF self-excited generator of the
linear ion accelerator // XII All-Union Workshop of
Linear Accelerators of Charged Particles
(Kharkov, May 28-30, 1991), Abstracts, p. 51 (in
Russian).
ВОПРОСЫ АТОМНОЙ НАУКИ И ТЕХНИКИ. 2001. №5.
Серия: Ядерно-физические исследования (39), с. 159-159.
159
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