The use of series BA permanent magnets in steerers of the beam extracted from the electron linac
Relying on the results of test bench simulation and magnetic measurements, barium plates BA (typical size is 180x80x16 mm) were used to manufacture “dipole magnet”-type units with a constant field of intensity up to 1.8 kOe in the working gap of 3 to 3.5 cm in height. The operating experience with...
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України
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| Цитувати: | The use of series BA permanent magnets in steerers of the beam extracted from the electron linac / A.N. Dovbnya, L.K. Myakushko, A.E. Tolstoj, V.A. Shendrik // Вопросы атомной науки и техники. — 2004. — № 2. — С. 93-95. — Бібліогр.: 4 назв. — англ. |
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Dovbnya, A.N. Myakushko, L.K. Tolstoj, A.E. Shendrik, V.A. 2015-03-31T14:21:54Z 2015-03-31T14:21:54Z 2004 The use of series BA permanent magnets in steerers of the beam extracted from the electron linac / A.N. Dovbnya, L.K. Myakushko, A.E. Tolstoj, V.A. Shendrik // Вопросы атомной науки и техники. — 2004. — № 2. — С. 93-95. — Бібліогр.: 4 назв. — англ. 1562-6016 PACS: 07.55.+k https://nasplib.isofts.kiev.ua/handle/123456789/79355 Relying on the results of test bench simulation and magnetic measurements, barium plates BA (typical size is 180x80x16 mm) were used to manufacture “dipole magnet”-type units with a constant field of intensity up to 1.8 kOe in the working gap of 3 to 3.5 cm in height. The operating experience with the accelerators KUT has shown that these devices are convenient in service, are easy-to-transport and can be used to advantage to solve various problems in electron beam formation and steering at the exit of the accelerator. На основі стендового моделювання та магнітних вимірювань з барієвих плиток БА (типорозмір 180Х80Х16 мм) виготовлені блоки типу “дипольний магніт” з постійним полем напруженістю до 1,8 кЕ в робочому зазорі висотою 3...3,5 см. Досвід застосування на прискорювачах КУТ показав, що такі пристрої зручні в експлуатації, легко транспортуються та можуть успішно вирішувати різноманітні задачі з формування та керування пучком електронів на виході прискорювача. На основе стендового моделирования и магнитных измерений из бариевых плиток БА (типоразмер 180Х80Х16 мм) изготовлены блоки вида “дипольный магнит” с постоянным полем напряженностью до 1.8 кЭ в рабочем зазоре высотой 3...3.5 см. Опыт применения на ускорителях КУТ показал, что такие устройства удобны в эксплуатации, легко транспортируемы и могут успешно решать различные задачи по формированию и управлению пучком электронов на выходе ускорителя. The authors thank O.A.Repikhov and V.A.Popenko for management and participation in the experiment with a beam at accelerators, Z.M.Kolot for the appreciable help in presentation of graphic information. en Національний науковий центр «Харківський фізико-технічний інститут» НАН України Вопросы атомной науки и техники Элементы ускорителей The use of series BA permanent magnets in steerers of the beam extracted from the electron linac Застосування постійних магнітів серії БА в пристроях керування виведеним пучком ЛПЕ Применение постоянных магнитов серии БА в устройствах управления выведенным пучком ЛУЭ Article published earlier |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| title |
The use of series BA permanent magnets in steerers of the beam extracted from the electron linac |
| spellingShingle |
The use of series BA permanent magnets in steerers of the beam extracted from the electron linac Dovbnya, A.N. Myakushko, L.K. Tolstoj, A.E. Shendrik, V.A. Элементы ускорителей |
| title_short |
The use of series BA permanent magnets in steerers of the beam extracted from the electron linac |
| title_full |
The use of series BA permanent magnets in steerers of the beam extracted from the electron linac |
| title_fullStr |
The use of series BA permanent magnets in steerers of the beam extracted from the electron linac |
| title_full_unstemmed |
The use of series BA permanent magnets in steerers of the beam extracted from the electron linac |
| title_sort |
use of series ba permanent magnets in steerers of the beam extracted from the electron linac |
| author |
Dovbnya, A.N. Myakushko, L.K. Tolstoj, A.E. Shendrik, V.A. |
| author_facet |
Dovbnya, A.N. Myakushko, L.K. Tolstoj, A.E. Shendrik, V.A. |
| topic |
Элементы ускорителей |
| topic_facet |
Элементы ускорителей |
| publishDate |
2004 |
| language |
English |
| container_title |
Вопросы атомной науки и техники |
| publisher |
Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| format |
Article |
| title_alt |
Застосування постійних магнітів серії БА в пристроях керування виведеним пучком ЛПЕ Применение постоянных магнитов серии БА в устройствах управления выведенным пучком ЛУЭ |
| description |
Relying on the results of test bench simulation and magnetic measurements, barium plates BA (typical size is
180x80x16 mm) were used to manufacture “dipole magnet”-type units with a constant field of intensity up to
1.8 kOe in the working gap of 3 to 3.5 cm in height. The operating experience with the accelerators KUT has shown
that these devices are convenient in service, are easy-to-transport and can be used to advantage to solve various
problems in electron beam formation and steering at the exit of the accelerator.
На основі стендового моделювання та магнітних вимірювань з барієвих плиток БА (типорозмір
180Х80Х16 мм) виготовлені блоки типу “дипольний магніт” з постійним полем напруженістю до 1,8 кЕ в
робочому зазорі висотою 3...3,5 см. Досвід застосування на прискорювачах КУТ показав, що такі пристрої
зручні в експлуатації, легко транспортуються та можуть успішно вирішувати різноманітні задачі з
формування та керування пучком електронів на виході прискорювача.
На основе стендового моделирования и магнитных измерений из бариевых плиток БА (типоразмер
180Х80Х16 мм) изготовлены блоки вида “дипольный магнит” с постоянным полем напряженностью до
1.8 кЭ в рабочем зазоре высотой 3...3.5 см. Опыт применения на ускорителях КУТ показал, что такие
устройства удобны в эксплуатации, легко транспортируемы и могут успешно решать различные задачи по
формированию и управлению пучком электронов на выходе ускорителя.
|
| issn |
1562-6016 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/79355 |
| citation_txt |
The use of series BA permanent magnets in steerers of the beam extracted from the electron linac / A.N. Dovbnya, L.K. Myakushko, A.E. Tolstoj, V.A. Shendrik // Вопросы атомной науки и техники. — 2004. — № 2. — С. 93-95. — Бібліогр.: 4 назв. — англ. |
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THE USE OF SERIES BA PERMANENT MAGNETS IN STEERERS
OF THE BEAM EXTRACTED FROM THE ELECTRON LINAC
A.N. Dovbnya, L.K. Myakushko, A.E. Tolstoj, V.A. Shendrik
National Science Center “Kharkov Institute of Physics and Technology”
61108, Kharkov, Ukraine
Relying on the results of test bench simulation and magnetic measurements, barium plates BA (typical size is
180x80x16 mm) were used to manufacture “dipole magnet”-type units with a constant field of intensity up to
1.8 kOe in the working gap of 3 to 3.5 cm in height. The operating experience with the accelerators KUT has shown
that these devices are convenient in service, are easy-to-transport and can be used to advantage to solve various
problems in electron beam formation and steering at the exit of the accelerator.
PACS: 07.55.+k
Extension of the class of radiation works on the ex-
ternal electron beam from the accelerator KUT-20 [1]
has given rise to a problem of searching new devices for
beam extraction and irradiation field formation. For the
long-term treatment of large-scale objects one uses suc-
cessfully electromagnetic scanners we have developed
[2], but for the work with converters one needs an ex-
tracted electron beam of a maximum density (power)
and, respectively, of a minimum cross-section that, as a
rule, leads to failure in the foil of the exit window.
Therefore, besides development of special exit windows
of a small area (see, this volume), in the course of time,
a demand arose to have a device of “fast technology”.
For example, a scanned electron beam in air is contrac-
ted again and is concentrated into required sizes. It is
advisable that this device be independent, movable, not
requiring power supplies and evacuation and its assem-
bling and disassembling should take a few minutes of
the accelerator time.
A search has shown that a similar device can be real-
ized on the base of metal-laminated series BA magnets
the properties and features of which are described suffi-
ciently e.g. in [3].
In the course of selecting and designing the device
construction, barium anisotropy plates 2BA (typical size
is 180x80x16 mm) were used in different combinations
- from single to composite units by thickness and
lengths. The criteria were: electron energy 15…
25 MeV, working gap of 3 cm in height, maximally pos-
sible values of the strength of a magnetic field and its
integral length along the beam path.
At first from available single magnets the plates se-
lected were by a maximum residual magnetization and
by their identity: in five points (on angles and in center)
on top side and on lower side, without substrate of steel
and with substrate. It has been established, that in the
case with steel the strength on the surface increases by
~30% and as “flattens out” throughout the surface being
on average 550 Oe.
To study experimentally the magnetic field distribu-
tion in the assumed working gap and on its edges we
have assembled a dummy including four plates and a
standard C-core from the magneto-discharge- type vacu-
um pump with poles each of which comprising two
plates fastened together and a gap of 3 cm in height.
Fig.1 gives the results of measurements allowing to con-
clude that the value of the strength inside the gap, uni-
formity and behaviour of field decrease at the edge are
in conformity with requirements to the “classic” C-core
magnet (electromagnet) that provided the basis for de-
velopment of the design of the whole device.
In gap Out gap
H, Oe
Fig. 1. Magnetic field distribution in the median plane
of the dummy
In Fig.2 shown is the schematic diagram of the double
magnet with parallel- and antiparallel fields designed for
“contraction” of the electron beam scanned by the elec-
tromagnet of the scanner. In essence, these are two
identical magnets spaced at a 3 cm distance in which the
field directions inside the working gap are opposite, and
in the central part the field is compensated (Fig.3,a,b).
Each of poles of a single magnet is a composite bar
of three magnetic laminas. Around the side perimeter
the bar is rigidly tightened with a stainless-steel strip.
The C-core is made from soft iron laminas (St.3); it
bears some important functions: frame, core of the re-
verse magnetic flux and “amplifier” of lamina magneti-
zation. The poles in the assembly are fastened by point
welding to the upper lamina and lower lamina of the
core. Both magnets are rigidly joined together with the
use of two other nonmagnetic laminas. These laminas,
as well as the main steel walls have longitudinal slots
for bolts that provides adjustment and positioning of
working magnet gaps.
In Fig.4 the scheme of the experiment on determin-
ing the efficiency of the device developed is shown. The
accelerator produced electron beam of an energy ≈
25 MeV and a pulsed current ≈0.5 A was scanned by a
___________________________________________________________
PROBLEMS OF ATOMIC SIENCE AND TECHNOLOGY. 2004. № 2.
Series: Nuclear Physics Investigations (43), p.93-95.
93
scanner electromagnet (2) onto an exit window foil (3)
as a band (4) having a length of about 9 cm, and then in
air the beam failed into the gap of a double magnet (5).
1 2 3
4 2cm
Fig.2. Schematic diagram of the magnet with an anti-
parallel field: 1 - magnetic circuit (St3 steel); 2 - con-
necting plate (duralumin); 3 - pole; 4 - adjusting slot
321
a)
b)
H, Oe
Fig.3. Direction (a) and field value (b) in the real mag-
net: 1 - magnetic circuit; 2 - pole; 3 - median plane of
beam scanning (see fig.5,a)
Fig.4. Sсheme of the experiment on determining the
magnet efficiency
1 - accelerator produced beam; 2 - electromagnet of the
scanner with the scanner chamber; 3 - exit window;
4 - electron beam scanned with the scanner; 5 - magnet
with an antiparallel field; 6 - trajectory of the beam be-
ing “contracted”(schematics)
The effect of the antiparallel magnetic field is seen
in fig.5: the transversal phase beam volume (5,a) is
transformed into the longitudinal one (5,b), the beam is
concentrated around the original accelerator axis. The
longitudinal spread of “focal” distances of some beam
envelopes, seen in fig.4, is explained by the imperfec-
tion in the angular optics of the magnetic track, the opti-
mization of which at the first stage has not been speci-
fied.
a)
b)
Fig.5. Beam image: at the exit window (a);
behind the magnet (b)
In the course of adjustment and alignment of the exit
window with a minor diameter, when the scanner elec-
tromagnet (fig.4, pos.2) did not turned on and then did
not been at all, there appeared an urgent necessity of op-
erative determining the energy of extracted not scanned
electron beam. In this case, the above described antipar-
allel magnet was transformed (by 180° “inversion” of
one half and by joining together both parts) into an one-
piece planoparallel dipole magnet having the following
characteristics: H0 ≈ 1.75 kOe, D0 ≈3 cm, width of good
field region ≈ 11 cm, effective length of field along the
beam trajectory ≈ 17 cm. In this performance the device
was applied as a portable quasi-spectrometer of the elec-
tron beam in air directly behind the exit window by the
methods of [4]. Thanks to this feature we have checked
out during a short time the accelerator KUT-20 opera-
tion conditions by the beam current and electron energy,
that allowed to put the acelerator into standard operation
for different programs.
The authors thank O.A.Repikhov and V.A.Popenko
for management and participation in the experiment
with a beam at accelerators, Z.M.Kolot for the apprecia-
ble help in presentation of graphic information.
REFERENCES
1. A.N.Dovbnya, A.E.Tolsltoj, V.A.Shendrik. Forma-
tion of Scanner Magnetic-Optical Characteristics in
the NSC KIPT New-Generation Electron Linak
KUT-20 //Voprosy Atomnoj Nauki i Tekhniki
Ser.,Yaderno-Fizicheskie Issledovaniya, 2001, No 3
(38), p.124-125.
2. A.N.Dovbnya, A.I.Kosoj, A.E.Tolstoj,
V.A.Shendrik. Scanning and formation of the beam
extracted from multipurpose electron accelerators
//Voprosy Atomnoj Nauki i Tekhnik. Ser: Yaderno-
Fizicheskie Issledovaniya, 1997, No 1(28), p.114-
121.
94
3. A.A.Preobrazhensky. Magnetic materials. Publ.
M:“Vysshaya shkola” 1965, p.148.
4. V.N.Boriskin, A.E.Tolstoj, V.A.Shendrik. Skan-
ning of the extracted beam and monitoring of elec-
tron energy at technological linear accelerators //
Voprosy Atomnoj Nauki i Tekhniki. Ser: Yaderno-
Fizicheskie Issledovaniya 1997, No 4,5 (31,32),
v.2, p.57-59.
ПРИМЕНЕНИЕ ПОСТОЯННЫХ МАГНИТОВ СЕРИИ БА В УСТРОЙСТВАХ УПРАВЛЕНИЯ
ВЫВЕДЕННЫМ ПУЧКОМ ЛУЭ
А.Н. Довбня, Л.К. Мякушко, А.Е. Толстой, В.А. Шендрик
На основе стендового моделирования и магнитных измерений из бариевых плиток БА (типоразмер
180Х80Х16 мм) изготовлены блоки вида “дипольный магнит” с постоянным полем напряженностью до
1.8 кЭ в рабочем зазоре высотой 3...3.5 см. Опыт применения на ускорителях КУТ показал, что такие
устройства удобны в эксплуатации, легко транспортируемы и могут успешно решать различные задачи по
формированию и управлению пучком электронов на выходе ускорителя.
ЗАСТОСУВАННЯ ПОСТІЙНИХ МАГНІТІВ СЕРІЇ БА В ПРИСТРОЯХ КЕРУВАННЯ
ВИВЕДЕНИМ ПУЧКОМ ЛПЕ
А.М. Довбня, Л.К. М’якушко, А.Ю. Толстой, В.А. Шендрик
На основі стендового моделювання та магнітних вимірювань з барієвих плиток БА (типорозмір
180Х80Х16 мм) виготовлені блоки типу “дипольний магніт” з постійним полем напруженістю до 1,8 кЕ в
робочому зазорі висотою 3...3,5 см. Досвід застосування на прискорювачах КУТ показав, що такі пристрої
зручні в експлуатації, легко транспортуються та можуть успішно вирішувати різноманітні задачі з
формування та керування пучком електронів на виході прискорювача.
___________________________________________________________
PROBLEMS OF ATOMIC SIENCE AND TECHNOLOGY. 2004. № 2.
Series: Nuclear Physics Investigations (43), p.93-95.
95
A.N. Dovbnya, L.K. Myakushko, A.E. Tolstoj, V.A. Shendrik
National Science Center “Kharkov Institute of Physics and Technology”
61108, Kharkov, Ukraine
REFERENCES
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