Design of compact system with wide electron beam for radiation technologies
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| Zitieren: | Design of compact system with wide electron beam for radiation technologies / A.N. Korolyov, K.G. Simonov, V.M. Pirozhenko// Вопросы атомной науки и техники. — 2001. — № 3. — С. 30-32. — Бібліогр.: 3 назв. — англ. |
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irk-123456789-792242015-03-31T03:01:39Z Design of compact system with wide electron beam for radiation technologies Korolyov, A.N. Simonov, K.G. Pirozhenko, V.M. 2001 Article Design of compact system with wide electron beam for radiation technologies / A.N. Korolyov, K.G. Simonov, V.M. Pirozhenko// Вопросы атомной науки и техники. — 2001. — № 3. — С. 30-32. — Бібліогр.: 3 назв. — англ. 1562-6016 PACS nambers: 29.27.-a http://dspace.nbuv.gov.ua/handle/123456789/79224 en Вопросы атомной науки и техники Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
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Korolyov, A.N. Simonov, K.G. Pirozhenko, V.M. |
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Korolyov, A.N. Simonov, K.G. Pirozhenko, V.M. Design of compact system with wide electron beam for radiation technologies Вопросы атомной науки и техники |
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Korolyov, A.N. Simonov, K.G. Pirozhenko, V.M. |
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Korolyov, A.N. |
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Design of compact system with wide electron beam for radiation technologies |
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Design of compact system with wide electron beam for radiation technologies |
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Design of compact system with wide electron beam for radiation technologies |
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Design of compact system with wide electron beam for radiation technologies |
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Design of compact system with wide electron beam for radiation technologies |
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design of compact system with wide electron beam for radiation technologies |
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
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2001 |
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Design of compact system with wide electron beam for radiation technologies / A.N. Korolyov, K.G. Simonov, V.M. Pirozhenko// Вопросы атомной науки и техники. — 2001. — № 3. — С. 30-32. — Бібліогр.: 3 назв. — англ. |
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Вопросы атомной науки и техники |
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AT korolyovan designofcompactsystemwithwideelectronbeamforradiationtechnologies AT simonovkg designofcompactsystemwithwideelectronbeamforradiationtechnologies AT pirozhenkovm designofcompactsystemwithwideelectronbeamforradiationtechnologies |
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2025-07-06T03:16:36Z |
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DESIGN OF COMPACT SYSTEM WITH WIDE ELECTRON BEAM
FOR RADIATION TECHNOLOGIES
A.N. Korolyov, K.G. Simonov, V.M. Pirozhenko1
FSUE “RPC Istok”, Fryazino, Moscow region, Russia
1“Biosterile technologies”, Moscow, Russia.
PACS numbers: 29.27.-a
1 INTRODUCTION
The development and translation of ecologically safe
electron-beam technologies into industry and medicine
to produce materials with improved characteristics and
to sterilize medical devices, have demanded the applica-
tion of relatively low-energy (100-200 keV) powerful
electron beams.
In the recent years there has been observed extensive
activity in these fields. To introduce widely the low-en-
ergy electron-beam technology, a demand arose for the
production of high-quality sources of high-power elec-
tron beams. FSUE “RPC Istok” has developed a new
class of devices, namely electron sealed-off guns gener-
ating electron beams with a high pulsed power and ex-
tracting them into atmosphere or a gas medium [1, 2].
There have been devised two kinds of sealed-off guns
and the radiation systems on their basis.
2 SYSTEMS AND ELECTRON GUNS FOR
IRRADIATION OF FIXED OBJECTS
The electron sealed-off gun (Fig.1) is a version of a
direct-action accelerator, evacuated and hermitically
sealed directly at the manufacturer’s facility; it is further
operated without vacuum pumps, much like in the case
with a TV-tube.
Fig.1. Electron gun with two round cathodes.
The electron beam is brought out through thin titani-
um foil, so the irradiation is performed instantaneously
on a rather large area without using beam sweep de-
vices. The gun is equipped with two round cathodes and
special shaping electrodes providing diverging electron
flows featuring uniform distribution of the electron flow
density in the output unit region.
Table 1. Parameters of guns with round cathodes
Gun version EG-1 EG-2 EG-3
Cathode diameter (mm) 5.7 11.4 24
Maximum pulse current
from the cathodes (A)
6 15 80
Maximum voltage (kV) 200
Radiation area (mm) 200 x 100
Foil thickness in the
output window (µm)
20
The electron sealed-off gun, unlike the other elec-
tron guns, is compact, reliable, durable, and has a short
time to be prepared and operated.
Based on guns EG-1 and EG-2, FSUE “MRTI
RAN” and LLC “Biosterile technologies” have devel-
oped compact systems for electron-beam technologies
PYXIS-1 and PYXIS-2 [3], at service in the 3M Com-
pany, St. Paul, USA (Fig. 2).
Fig. 2. PYXIS-1 system in operation.
The systems provide the irradiation of separate ob-
jects placed into the nitrogen-filled irradiation chamber.
Low sizes of the systems are obtained due to the com-
pactness of the electron-beam sealed-off gun as well as
the high-voltage (200 kV) pulsed transformer designed
by FSUE “MRTI RAN”.
ВОПРОСЫ АТОМНОЙ НАУКИ И ТЕХНИКИ. 2001. №3.
Серия: Ядерно-физические исследования (38), с. 30-32.
30
Table 2. Main parameters of the systems
System version PYXIS-1 PYXIS-2
Type of gun EG-1 EG-2
Accelerating voltage
(kV)
100 –200
Dose rate (kGy/s) 10 30
Pulse dose rate (kGy/s) 3 104 105
Pulse repetition rate
(pps)
50-150 5-300
Pulse width (µs) 1 1
Radiation area (mm) 200×100
System sizes (m) 0.7×0.7×2
Water cooling Autonomous
The PYXIS-1 system is mounted in a radioelectronic
cabinet. Besides The PYXIS-2 system contains the
high-voltage power supply (0.7×0.7×1 m).
3 SYSTEMS ADN ELECTRON GUNS FOR
IRRADIATION OF MOVING TAPES
FSUE “RPC Istok” in cooperation with LLC “Bios-
terile technologies” have developed the system to irradi-
ate separate objects as well as a continuously moving
tape 300 mm wide. Such a plant needs the use of an
electron sealed-off gun providing a wide electron beam
at the output.
The development of such a gun gives rise to a set of
problems to be solved. The major issues are as follows:
- development of an electron optical system providing
uniform distribution of the electron beam beyond the
window;
- development of a reliable ribbon cathode at low fila-
ment current (5 A max), necessary to produce a compact
pulsed transformer;
- development of an extended electron output window.
Fig. 3. Electron beam in a half of the gun with a
ribbon cathode
Figure 3 shows the calculated distribution of the
electron beam. A ribbon cathode having an emitting
area of 320×6 mm and a shaping electrode produces a
diverging electron beam (320×40 mm) in the output
window region.
The extended ribbon cathode is manufactured as a
set of eight interconnected simple ribbon cathode
40 mm long each. The total cathode filament power is
200 W.
Fig. 4. Output window of the gun with a ribbon
cathode.
The electron output window (Fig. 4) consists of
three parts, and a package interconnected by argon arc
welding. Each of the window contains the copper grate
and 20 µm titanium foil. The window is cooled with wa-
ter; the cooling lines are located in the window periph-
ery.
There has been engineered a construction, and man-
ufactured a test prototype of the electron sealed-off gun
(Fig. 5). Its tests are now under way.
Fig. 5. Electron gun with a ribbon cathode.
Table 3. Parameters of the gun with a ribbon cathode
Cathode dimensions (mm) 320×6
Max. pulse current from the cathode
(A)
25
Maximum voltage (kV) 200
Radiation area (mm) 300×40
Design of a high-voltage pulse transformer has been
developed. The transformer consists of a number of
identical modules interconnected in series, thus produc-
ing a secondary high-voltage winding. The transformer
is coupled with the electron gun via a short coaxial feed-
er, forming a common structure, i.e. a radiation source.
The transformer and the feeder are filled with trans-
former oil so that the outer side of the electron gun insu-
lator is immersed in oil.
Now the design of TAPIS radiation system has been
developed using the electron gun with a ribbon cathode.
It includes the processing cabinet and the power supply
cabinet.
The processing cabinet contains the electron gun, the
high-voltage pulse transformer, the transport mechanism
for the tape, the autonomous water cooling system, and
the radiation shielding (Fig. 6).
31
Fig. 6. Processing cabinet of the TAPIS system.
Table 4. Main parameters of the TAPIS system
Accelerating voltage (kV) 100 – 200
Dose rate (kGy/s) 60
Pulse dose rate (kGy/s) 2.6 × 105
Pulse repetition rate (pps) 5 – 150
Pulse width (µs) 1.5
Width of tape (mm) 300
Speed of tape (mm/s) 20 − 200
Power supply cabinet sizes (m) 0.7×0.7×2
Processing cabinet sizes (m) 1×1.2×1.2
Water cooling Autonomous
4 CONCLUSION
As a result of the work, design of a compact system
for radiation processing of products and materials has
been developed. The system provides two modes of ir-
radiation, i.e. irradiation of continuously moving tapes
and fixed samples. The irradiation is performed in a her-
metically sealed chamber filled by nitrogen.
This ecologically pure system includes the radiation
protection, autonomous water cooling system and auto-
mated PC-control. It can be placed in any production or
clinical room.
REFERENCES
1. K.G.Simonov. Electron sealed-off guns. Moscow.
Radio and Communications, 1985.
2. A.N.Korolyov, K.G.Simonov. Sealed-off high-
power electron gun having a modular design //
Problems of Atomic Science and Technology. Is-
sue: Nuclear-Physics Research. 1977, # 4.
3. V.M.Pirozhenko, A.N.Korolyov, K.G.Simonov.
Compact 200-keV electron beam systems // Proc.
of Particle Accelerator Conference PAC 2001.
32
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