Study of a biperiodic slow-wave structure at medium energies
In the present work charged particle accelerators occupy the important place both in scientific, and in practical applications.
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| Дата: | 1999 |
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| Автори: | , , |
| Формат: | Стаття |
| Мова: | English |
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України
1999
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| Назва видання: | Вопросы атомной науки и техники |
| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/81364 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Study of a biperiodic slow-wave structure at medium energies / O.G. Zagorodnov, V.G. Papkovich, N.A. Khizhnyak // Вопросы атомной науки и техники. — 1999. — № 3. — С. 47. — Бібліогр.: 2 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| id |
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irk-123456789-813642015-05-15T03:02:30Z Study of a biperiodic slow-wave structure at medium energies Zagorodnov, O.G. Papkovich, V.G. Khizhnyak, N.A. In the present work charged particle accelerators occupy the important place both in scientific, and in practical applications. 1999 Article Study of a biperiodic slow-wave structure at medium energies / O.G. Zagorodnov, V.G. Papkovich, N.A. Khizhnyak // Вопросы атомной науки и техники. — 1999. — № 3. — С. 47. — Бібліогр.: 2 назв. — англ. 1562-6016 http://dspace.nbuv.gov.ua/handle/123456789/81364 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 |
| description |
In the present work charged particle accelerators occupy the important place both in scientific, and in practical applications. |
| format |
Article |
| author |
Zagorodnov, O.G. Papkovich, V.G. Khizhnyak, N.A. |
| spellingShingle |
Zagorodnov, O.G. Papkovich, V.G. Khizhnyak, N.A. Study of a biperiodic slow-wave structure at medium energies Вопросы атомной науки и техники |
| author_facet |
Zagorodnov, O.G. Papkovich, V.G. Khizhnyak, N.A. |
| author_sort |
Zagorodnov, O.G. |
| title |
Study of a biperiodic slow-wave structure at medium energies |
| title_short |
Study of a biperiodic slow-wave structure at medium energies |
| title_full |
Study of a biperiodic slow-wave structure at medium energies |
| title_fullStr |
Study of a biperiodic slow-wave structure at medium energies |
| title_full_unstemmed |
Study of a biperiodic slow-wave structure at medium energies |
| title_sort |
study of a biperiodic slow-wave structure at medium energies |
| publisher |
Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| publishDate |
1999 |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/81364 |
| citation_txt |
Study of a biperiodic slow-wave structure at medium energies / O.G. Zagorodnov, V.G. Papkovich, N.A. Khizhnyak // Вопросы атомной науки и техники. — 1999. — № 3. — С. 47. — Бібліогр.: 2 назв. — англ. |
| series |
Вопросы атомной науки и техники |
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| first_indexed |
2025-07-06T06:06:06Z |
| last_indexed |
2025-07-06T06:06:06Z |
| _version_ |
1836876531965624320 |
| fulltext |
STUDY OF A BIPERIODIC SLOW-WAVE STRUCTURE AT MEDIUM
ENERGIES
O.G.Zagorodnov, V.G.Papkovich, N.A.Khizhnyak
NSC KIPT, Kharkov, Ukraine
In the present work charged particle accelerators
occupy the important place both in scientific, and in
practical applications [1]. The wide spectrum of
accelerator applications compels the developers to
upgrade existing and to develop new accelerating
structures to conform the most full up-to-date
requirements in technical and physical characteristics
(energy, currents etc.), as well as in practical (e.g.
weight and size), including financial and economic
ones. The biperiodic, coupling on a π-wave slow-wave
structure (BSWS) [2] can serve as one of such versions
of the proton linac accelerating structure in the energy
range (20-100) MeV (0.15<β<0.45). In such BSWS
quarter wavelength the strip-geometry resonators are as
accelerating cells. Coupling resonators are chosen as the
quarter wavelength resonators too, but they are made as
a loop. These loopback coupling resonators are put in
accelerating resonator electromagnetic field symmetry
planes.
Shorting metal planes are put in end faces of
BSWS. The accelerating resonators are placed at
distances of a quarter wavelength (λg/4) from the faces
of shorting metal plates. Thus, they are in places of
BSWS crests, whereas the loopback coupling resonators
are placed in nodes of the BSWS. Accordingly, all
coupling resonators are unexcited.
0 0 . 2 5 0 . 7 5 1
0
1
z / L
E
/ E
0
d r i f t
t u b e
g a p d r i f t
t u b e
Fig. 1. The electrical field distribution along a gap
The high-frequency accelerating fields in the
BSWS are π/2- modes, i.e. the phase shift between
neighbouring resonators of link and accelerating
resonators is equal to π/2.
In BSWS the interaction of accelerated charged
particles with a slow wave is the π- interaction.
Therefore BSWS operation is chosen under the standing
wave condition as the most practical one.
The measurements of BSWS parameters were
carried out on an experimental structure model. There
are four copper rings with a diameter D = 201 mm in
the model. Two-quarter wavelength accelerating
vibrators and one loopback coupling resonator are
inside of it. The length L0 of each ring is equal to a
quarter of a wavelength in BSWS and makes 39 mm, so
the wavelength is λg = 4L0 = 0,156 m.
The electrical accelerating field distribution (in
relative units, E0 is an electric field strength in the gap
middle) on the accelerator axis in the middle gap
between two neighbouring accelerating electrodes is
shown in Fig.1. The common observed dates are shown
in Table 1.
Table 1. Main parameters of investigated BSWS
Resonator length (in BSWS one wavelength
is two accelerating vibrators). m, λg = 4L0
0,156
Total effective length of gaps in the
resonator, m, geff
0,083
5
Working frequency of π- wave, MHz, f0 475,3
Free space wavelength, m, λ0 0,631
Phase velocity in BSWS at working
frequency of π-mode, βph
0,247
Energy of accelerated protons, MeV, W 30
Own quality-factor of the half wavelength
resonator, Q1
2975
Own quality-factor of the resonator on one
wavelength, Q2
3854
Quality-factor of the indefinitely long
resonator, Q∞
5514
Displacement of frequency by a metal ball
(r = 2,6.10-3 m), Hz, ∆f
99277
Efficiency of a gap, T 0,859
Shunt impedance, MΩ/m, Rsh 16,7
The relation of shunt impedance to quality-
factor, MΩ/m, Rsh/Q∞
3028
Effective shunt impedance, MΩ/m, Zeff 25,86
Attenuation field constant, mcs, τ = Q∞/πf0 3,69
Depth of a skin layer, micron, δ 3
Relation of a wavelength to a diameter, λ0/D 3
Table 2. A comparison of accelerating structures
(given for f = 150 MHz)
Structure BSWS Alvarez H111
Rsh/Q∞, MΩ/m 955
Zeff , MΩ/m 14,53 29 9
Q∞ 9785 60000 (94475)
τ, mcs 20 127 (200)
δ, micron 5,4
* In brackets the computed values are given.
Thus, the BSWS under consideration should
have values Zeff of about (20-27) MΩ/m. It is much
higher than the effective shunt impedance of structures
with a parallel connection of gaps and is comparable to
values Zeff of Alvarez structure at a working frequencies
of 150 MHz in the considering energy range being
investigated.
REFERENCES
1. CERN Courier. Applying the Accelerator. Special
issue. 1995. Vol.35. P.1-25.
2. O.G.Zagorodnov, V.G.Papkovich, N.A.Khizhnyak.
An investigation of biperiodic slow-wave structure.
Preprint KIPT 93-1.-Kharkov, KIPT, 1993. 19 p. (in
Russian).
ВОПРОСЫ АТОМНОЙ НАУКИ И ТЕХНИКИ. 1999. №3.
Серия: Ядерно-физические исследования. (34), с. 47.
47
REFERENCES
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