Experimental study of accelerating field distribution optimization in the H-structure with comb holders
We have suggested to perform the tuning the structure accelerating field distribution at the wave similar to H, by changing the inductivity of the holder of a single drift tube. Changing the angle of bend of the adjacent drift tube holders along different sides relatively to the comb holder plane...
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України
2004
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| Cite this: | Experimental study of accelerating field distribution optimization in the H-structure with comb holders / G.A. Bryzgalov, E.N. Sokolenko // Вопросы атомной науки и техники. — 2004. — № 1. — С. 89-90. — Бібліогр.: 3 назв. — англ. |
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Bryzgalov, G.A. Sokolenko, E.N 2015-03-20T09:25:59Z 2015-03-20T09:25:59Z 2004 Experimental study of accelerating field distribution optimization in the H-structure with comb holders / G.A. Bryzgalov, E.N. Sokolenko // Вопросы атомной науки и техники. — 2004. — № 1. — С. 89-90. — Бібліогр.: 3 назв. — англ. 1562-6016 PACS: 29.17.+w https://nasplib.isofts.kiev.ua/handle/123456789/78708 We have suggested to perform the tuning the structure accelerating field distribution at the wave similar to H, by changing the inductivity of the holder of a single drift tube. Changing the angle of bend of the adjacent drift tube holders along different sides relatively to the comb holder plane allows one to increase and decrease the field amplitude in the gap between them. The value Rch ≈90 MОhm/m has been obtained for the structure under consideration that is higher than that obtained by known methods of tuning. Пропонується проводити настройку розподілу прискорюючого поля структури на хвилі, аналогічній Н, зміною індуктивності утримувача одиночної трубки дрейфу. Зміна кута повороту утримувачів сусідніх трубок дрейфу в різні боки щодо площини гребінчастого утримувача дає можливість як збільшувати, так і зменшувати амплітуду поля в зазорі між ними. Для структур, що розглядаються, отримано значення Rш ≈ 90 МОм⋅м⁻¹, що більш, ніж при відомих методах настройки. Предлагается проводить настройку распределения ускоряющего поля структуры на волне, аналогичной Н, изменением индуктивности держателя одиночной трубки дрейфа. Изменение угла поворота держателей соседних трубок дрейфа в разные стороны относительно плоскости гребенчатого держателя дает возможность как увеличивать, так и уменьшать амплитуду поля в зазоре между ними. Для рассматриваемых структур получено значение Rш ≈90 МОм⋅м⁻¹, что больше, чем при известных методах настройки. en Національний науковий центр «Харківський фізико-технічний інститут» НАН України Вопросы атомной науки и техники Элементы ускорителей Experimental study of accelerating field distribution optimization in the H-structure with comb holders Експериментальне вивчення оптимізації розподілу прискорюючого поля в Н-структурі з гребінчастими утримувачами Экспериментальное изучение опти- мизации распределения ускоряющего поля в Н-структуре с гребенчатыми держателями Article published earlier |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine |
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| title |
Experimental study of accelerating field distribution optimization in the H-structure with comb holders |
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Experimental study of accelerating field distribution optimization in the H-structure with comb holders Bryzgalov, G.A. Sokolenko, E.N Элементы ускорителей |
| title_short |
Experimental study of accelerating field distribution optimization in the H-structure with comb holders |
| title_full |
Experimental study of accelerating field distribution optimization in the H-structure with comb holders |
| title_fullStr |
Experimental study of accelerating field distribution optimization in the H-structure with comb holders |
| title_full_unstemmed |
Experimental study of accelerating field distribution optimization in the H-structure with comb holders |
| title_sort |
experimental study of accelerating field distribution optimization in the h-structure with comb holders |
| author |
Bryzgalov, G.A. Sokolenko, E.N |
| author_facet |
Bryzgalov, G.A. Sokolenko, E.N |
| topic |
Элементы ускорителей |
| topic_facet |
Элементы ускорителей |
| publishDate |
2004 |
| language |
English |
| container_title |
Вопросы атомной науки и техники |
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| format |
Article |
| title_alt |
Експериментальне вивчення оптимізації розподілу прискорюючого поля в Н-структурі з гребінчастими утримувачами Экспериментальное изучение опти- мизации распределения ускоряющего поля в Н-структуре с гребенчатыми держателями |
| description |
We have suggested to perform the tuning the structure accelerating field distribution at the wave similar to H, by
changing the inductivity of the holder of a single drift tube. Changing the angle of bend of the adjacent drift tube holders
along different sides relatively to the comb holder plane allows one to increase and decrease the field amplitude in the gap
between them. The value Rch ≈90 MОhm/m has been obtained for the structure under consideration that is higher than that
obtained by known methods of tuning.
Пропонується проводити настройку розподілу прискорюючого поля структури на хвилі, аналогічній Н, зміною індуктивності утримувача одиночної трубки дрейфу. Зміна кута повороту утримувачів сусідніх трубок дрейфу в різні боки щодо площини гребінчастого утримувача дає можливість як збільшувати, так і зменшувати амплітуду поля в зазорі між ними. Для структур, що розглядаються, отримано значення Rш ≈ 90 МОм⋅м⁻¹, що більш, ніж при відомих методах настройки.
Предлагается проводить настройку распределения ускоряющего поля структуры на волне, аналогичной Н, изменением индуктивности держателя одиночной трубки дрейфа. Изменение угла поворота держателей соседних трубок дрейфа в разные стороны относительно плоскости гребенчатого держателя дает возможность как увеличивать, так и уменьшать амплитуду поля в зазоре между ними. Для рассматриваемых структур получено значение Rш ≈90 МОм⋅м⁻¹, что больше, чем при известных методах настройки.
|
| issn |
1562-6016 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/78708 |
| citation_txt |
Experimental study of accelerating field distribution optimization in the H-structure with comb holders / G.A. Bryzgalov, E.N. Sokolenko // Вопросы атомной науки и техники. — 2004. — № 1. — С. 89-90. — Бібліогр.: 3 назв. — англ. |
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2025-11-25T22:42:31Z |
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2025-11-25T22:42:31Z |
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| fulltext |
EXPERIMENTAL STUDY OF ACCELERATING FIELD DISTRIBUTION
OPTIMIZATION IN THE H-STRUCTURE WITH COMB HOLDERS
G.A. Bryzgalov, E.N. Sokolenko
NSC “Kharkov Institute of Physics and Technology”,
1, Akademicheskaya st., 61108, Kharkov, Ukraine; E-mail: bryzgalov@kipt.kharkov.ua
We have suggested to perform the tuning the structure accelerating field distribution at the wave similar to H, by
changing the inductivity of the holder of a single drift tube. Changing the angle of bend of the adjacent drift tube holders
along different sides relatively to the comb holder plane allows one to increase and decrease the field amplitude in the gap
between them. The value Rch ≈90 MОhm/m has been obtained for the structure under consideration that is higher than that
obtained by known methods of tuning.
PACS: 29.17.+w
In low-energy proton accelerators the accelerating
structures are a cylindrical cavity loaded with pairs of
comb holders with drift tubes fastened on them are used.
In the structure the H11n wave is excited, where n equals
to the number of field variations along the cavity axis.
Usually, the H111 mode is used if the magnetic flow is
total for all the pairs of comb holders. It is possible to
use other modes, in which n equals to the number of
pairs of holders. For H-structures there are different
methods of tuning permitting to obtain the uniform ac-
celerating field distribution along the flight channel
[1,2]. However, it results in the considerable decrease of
the shunt resistance of a structure. The initial value of
the shunt resistance for the structure with the sinusoidal
field distribution along the structure channel is ≈
140 MOhm⋅m-1. The shunt resistance value decreases up
to 30...40 MOhm⋅m-1 after tuning due to the increase of
reference high-frequency power losses at structure sur-
faces and to the increase of the volumetric charge be-
tween face surfaces of drift tubes, the value of the shunt
resistance decreases to 30...40 MOhm⋅m-1.
It is possible to decrease considerably high frequen-
cy losses if tuning is made by varying the holder induc-
tivity of each separate drift tube and simultaneously to
change its connection over the magnetic field with the ad-
jacent drift tube holders. Then after defining the holder
position during tuning the free arc end is removed.
Fig.1 shows the cross section of an accelerating
structure. Plates of counter comb holders 2 and 3 with
drift tubes 3 fastened on them are placed, on opposite
walls of a cylindrical body of the cavity 1. Holders 5
and 6 of separate drift tubes are made in the form of the
straight cylindrical support fastened perpendicularly to
the external cylindrical drift tube surface, and that is the
extension of the arc of radius R. The second end of the
arc is fastened to the support plate of the comb holder
with the possibility of moving so, that it is possible to
change the angle of bend β of the support. It is neces-
___________________________________________________________
PROBLEMS OF ATOMIC SIENCE AND TECHNOLOGY. 2004. № 1.
Series: Nuclear Physics Investigations (42), p.89-90.
Fig.1 Cross section of the accelerating H-structure:
1 – cylindrical cavity body; 2, 3 – plates of counter comb holders; 4 – drift tubes; 5, 6 – holders of single drift tubes
with the changing angle of bend β
89
β
mailto:bryzgalov@kipt.kharkov.ua
sary to provide a high-frequency contact in this place.
Initially, the arc length is chosen under conditions pro-
viding the maximum angle of bend. Then, after the defi-
nition of the holder position during tuning, the free end
of the arc is removed.
The rotation of drift tube support may be clockwise
and counter clockwise. In this case the direction of the to-
tal magnetic flow enclosing the comb holder can coincide
with the magnetic flow of a separate holder or can be op-
posite one. By the same way the connection between
magnetic flows enclosing the support of adjacent drift
tubes will be changed. It gives the possibility to increase
or decrease the electric field amplitude in clearances on
both sides of drift tubes. In particular, we observe it at
last accelerating intervals of the structure shown in Fig.2,
where the drift tube 4 is placed on the holder 5 with the
possibility of turning relatively to the structure axis.
Fig.2,b shows the electric field amplitude distribu-
tion in the channel of flight between drift tubes at ends
of comb holders before tuning (dotted curve) and after
tuning of the holder 5 at the angle β=8 (solid curve).
The field amplitude varies insignificantly about 25% in
the next clearance.
Our studies have been carried out on the accelerat-
ing structure model presenting the copper cylindrical
cavity of 968 mm long and 160 mm in diameter loaded
by three pairs of holders with 47 drift tubes and two half
tubes placed on the bottoms of the cavity. The drift tube
location along the cavity axis, their lengths, the diameter
of the flight hole and the external diameter have been
determined by calculations of dynamics of accelerating
particles with alternative phase focusing [3].
The preliminary tuning of the electric field distribu-
tion along the flight channel has been done by means of
selection of the length and slopes of comb holders. The
operating frequency of the cavity equals to 264.5 MHz.
Fig.3. Field distribution along the flight channel formed
by drift tubes of the third pairs of comb holders after
varying the angle of bend of single drift tube holders 39,
40, 43, 45, 46 and 48
The initial shunt resistance of the structure with the
sinusoidal field distribution along the cavity length is
143 MOhm⋅m-1. The further tuning has been carried out
by changing the field amplitude in clearances between
the separate drift tubes.
The field distribution along the flight channel
formed by drift tubes placed on the third pair of comb
holders is shown in Fig.3. The value of accelerating in-
tervals between drift tubes in this part of a structure is
constant and equals to 7.6 mm. The external diameter of
tubes is 30 mm, the internal one is 14 mm. For the
38-th, 39-th and 40-th tubes the external diameter is
27 mm, and the internal one is 11 mm. The diameter of
supports is 5 mm. The angles of bend of supports of
tubes are for the 39-th (+48°), 42-th – (+40°), 43-d –(−
15°), 45-th – (+30°), 46-th – (−45°), 48-th – (+80°). The
field in clearances between 38-th, 39-th and 40-th tubes
is 0.9⋅Emax, that has been given by the calculations of dy-
namics of particles. The shunt resistance of a structure is
≈90 MOm⋅m-1, that is higher than that for earlier meth-
ods of tuning.
Thus, varying the inductivity of supports of single
drift tubes it is possible to optimize the electric field dis-
tribution in clearances along the flight channel of an ac-
celerating structure for the H-wave and to obtain the
shunt resistance higher than that for other known meth-
ods of tuning. The method of tuning proposed here is
simple and effective one.
REFERENCES
1. L.N. Baranov, G.A. Bryzgalov, V.V. Verbovsky et
al. Small-Sized 3 MeV Deutron Linac // VANT.
Ser. “Physics of High Energies and Atom
Nucleus”, 1975, iss. 1(13), p.15-17.
2. Ye.V. Gussev, S.V. Krivulya, N.A. Khizhnyak,
N.G. Shulika et al. Investigation of an Accelerating
Structure of Deutron Accelerator MLUD-3 //
VANT. Ser. “Nuclear Physical Methods of Investi-
gations”. М., 1989, № 5(5), p. 37-39.
3. Ye.V. Gussev, N.A. Khizhnyak, N.G.Shulika,
K.F. Kline. Accelerating H-Cavities with High
Electrodynamical Perfomances // VANT. Ser. “Nu-
clear Physical Investigations. M., 1997,
№ 2,3(29,30), v. 1, p. 187-189.
ЭКСПЕРИМЕНТАЛЬНОЕ ИЗУЧЕНИЕ ОПТИ-
МИЗАЦИИ РАСПРЕДЕЛЕНИЯ
УСКОРЯЮЩЕГО ПОЛЯ В Н-СТРУКТУРЕ С
ГРЕБЕНЧАТЫМИ ДЕРЖАТЕЛЯМИ
Г.А. Брызгалов, Е.Н. Соколенко
Предлагается проводить настройку распределения
ускоряющего поля структуры на волне, аналогичной
Н, изменением индуктивности держателя одиночной
трубки дрейфа. Изменение угла поворота держателей
соседних трубок дрейфа в разные стороны относи-
тельно плоскости гребенчатого держателя дает воз-
можность как увеличивать, так и уменьшать амплиту-
a
b
Fig.2. Longitudinal cross-section of an output part of
the accelerating H-structure model: 1 – cylindrical cav-
ity body ( a); 2, 3 – support plates of counter comb hold-
ers;
4 – drift tubes; 5 – holders of drift tube with the possibil-
ity to turn around the structure axis; Relative electrical
field distribution between drift tubes before tuning – dot-
ted curve and after tuning – solid curve (b)
90
90
ду поля в зазоре между ними. Для рассматриваемых структур получено значение Rш ≈90 МОм⋅м-1, что
больше, чем при известных методах настройки.
ЕКСПЕРИМЕНТАЛЬНЕ ВИВЧЕННЯ ОПТИМІЗАЦІЇ РОЗПОДІЛУ ПРИСКОРЮЮЧОГО ПОЛЯ
В Н-СТРУКТУРІ З ГРЕБІНЧАСТИМИ УТРИМУВАЧАМИ
Г.О. Бризгалов, Е.Н. Соколенко
Пропонується проводити настройку розподілу прискорюючого поля структури на хвилі, аналогічній Н,
зміною індуктивності утримувача одиночної трубки дрейфу. Зміна кута повороту утримувачів сусідніх
трубок дрейфу в різні боки щодо площини гребінчастого утримувача дає можливість як збільшувати, так і
зменшувати амплітуду поля в зазорі між ними. Для структур, що розглядаються, отримано значення Rш ≈
90 МОм⋅м-1, що більш, ніж при відомих методах настройки.
___________________________________________________________
PROBLEMS OF ATOMIC SIENCE AND TECHNOLOGY. 2004. № 1.
Series: Nuclear Physics Investigations (42), p.89-90.
91
G.A. Bryzgalov, E.N. Sokolenko
PACS: 29.17.+w
REFERENCES
Г.А. Брызгалов, Е.Н. Соколенко
Експериментальне вивчення оптимізації розподілу прискорюючого поля
Г.О. Бризгалов, Е.Н. Соколенко
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