Injector of the linac LU-20
The investigation have shown that the HV diode guns in combination with the forming system (collimator, deflector, buncher) are the most suitable for the use in injector accelerating structures with a high-power beam. The injector has been assembled with the linac and has been tested. In 1999 th...
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| Veröffentlicht in: | Вопросы атомной науки и техники |
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| Datum: | 1999 |
| Hauptverfasser: | , , , , , , , , |
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| Sprache: | Englisch |
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України
1999
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| Zitieren: | Injector of the linac LU-20 / V.I. Beloglazov, L.S. Dovbush, L.K. Myakushko, M.V. Otlev, L.V. Reprintsev, V.P. Romasko, Yu.D. Tur, V.A. Vishnyakov, V.V. Zakutin // Вопросы атомной науки и техники. — 1999. — № 4. — С. 105-106. — Бібліогр.: 2 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1859880848273178624 |
|---|---|
| author | Beloglazov, V.I. Dovbush, L.S. Myakushko, L.K. Otlev, M.V. Reprintsev, L.V. Romasko, V.P. Tur, Yu.D. Vishnyakov, V.A. Zakutin, V.V. |
| author_facet | Beloglazov, V.I. Dovbush, L.S. Myakushko, L.K. Otlev, M.V. Reprintsev, L.V. Romasko, V.P. Tur, Yu.D. Vishnyakov, V.A. Zakutin, V.V. |
| citation_txt | Injector of the linac LU-20 / V.I. Beloglazov, L.S. Dovbush, L.K. Myakushko, M.V. Otlev, L.V. Reprintsev, V.P. Romasko, Yu.D. Tur, V.A. Vishnyakov, V.V. Zakutin // Вопросы атомной науки и техники. — 1999. — № 4. — С. 105-106. — Бібліогр.: 2 назв. — англ. |
| collection | DSpace DC |
| container_title | Вопросы атомной науки и техники |
| description | The investigation have shown that the HV diode
guns in combination with the forming system
(collimator, deflector, buncher) are the most suitable for
the use in injector accelerating structures with a high-power beam. The injector has been assembled with the
linac and has been tested. In 1999 the injector had 1400
hours of operating time without accidents. The main
parameters of the gun were 110 keV and 1.1 A.
|
| first_indexed | 2025-12-07T15:52:18Z |
| format | Article |
| fulltext |
INJECTOR OF THE LINAC LU-20
V.I.Beloglazov, L.S.Dovbush, L.K.Myakushko, M.V.Otlev, L.V.Reprintsev, V.P.Romasko,
Yu.D.Tur, V.A.Vishnyakov, V.V.Zakutin
NCS KIPT, Kharkov, Ukraine
The principal goal of our work is development,
design, construction and subsequent appropriate
research on a high power electron linear accelerator
(beam energy up to 30 MeV, beam power more than
20 kW) for production of Technetium-99m [1].
An injector is the important part of a power high
current accelerator because it determines beam
characteristics as well as stability and reliability of a
whole linac. The injector of the LU-20 accelerator
includes the next elements for beam forming and for
control beam parameters:
The 80-120 keV electron gun energy with LaB6
cathode. The cathode is heated with electron beam from
the additional gun with HV 3-4 kV.
The HV modulator of the gun. The gun is
powered by a high voltage pulse modulator with full
discharge forming line. The load of modulator is 12 kΩ.
This allows to decrease the average power of modulator
by decreasing the power that is lost on the ballast
resistor. The modulator consists of next parts: line filter,
voltage controller RTM-220V-12kW, high voltage
transformer-rectifier VTM-12-40, filter capacitor IM-
13-50, charging reactor with charging diode, pulse
forming line, tiratron TGI-1-2500/35, pulse transformer,
ballast resistor (15 kΩ), clipping diode with voltage
dropping resistor. The forming line with impedance of
about 100Ω includes 10 capacitors (3500 pF). The six
cells are M-coupling with using variometers, and
second, third and tenth cells are common inductive-
coupling. To decrease the capacitance and inductance
loss in the pulse transformer the ribbon type of wires is
used in the primary (w=8) winding and the secondary
(w=74) winding is applied to conical core.
The test of modulator was performed both at the
test bench and at the LU-20 accelerator. Parameters of
the HV pulse: max. voltage – 120 kV, pulse length at
the level 0.5–7,3 µs, pulse flatness at the top (4.8 µs) –
1.2%.
The Electrostatic Deflector used for forming
sharp fronts of current pulse by deflection of low energy
electrons and its absorption in collimator.
The Collimator of beam is a copper cooling drum
with internal hole 10 mm in diameter.
The Beam Current Monitor is of induction type.
It represents the beam current transformer and has the
following basic parameters: beam current sensitivity
1 V/A; an error of sensitivity calibration ±3%; pulse top
tilt for the pulse length tp = 4µs ≤ 2%; pulse rise time
≤ 0.1 µs. Dimensions of the monitor: body diameter –
90 mm, length – 40 mm, aperture for beam passing –
28 mm. As the core the ferrite ring 4000NM-A type is
applied. The monitor is placed in the vacuum box,
which is connected to beam pipe by metallic seals. The
signal is taken out by the tight radiation hardness
connector. It is going to the signal processing apparatus
by RF-cable with length ∼ 40 m. For this monitor the
shielded twisted pair 100 Ω cable is applied. It has
allowed essentially to reduce a noise level from high-
power pulse generators. The possibility of operating
calibration of a monitor sensitivity by one-turn coil and
precision pulse current generator is provided.
The short magnetic lens for beam forming is
used.
The Corrector of the beam position for
deflecting the beam by the magnetic field of a strength
0.8·103 A/m is used.
The grouping resonator used for forming the
short bunch of electrons operates with a work frequency
of accelerator 2797MHz and a RF field amplitude
6 kV/sm.
The Magnetic Shield gives a geometry of
magnetic field at the solenoid entrance.
The accelerating structure with a variable phase
velocity. The length of waveguide is 3,05 m.
The Vacuum Beam pipe for passing electrons
from the injector to the accelerating section with
vacuum pressure 10-5 Pa is used.
The Vacuum System consists from the vacuum
pump of 2HBP-5D type and NMD-0.16 pump.
These elements are connected by metallic tubes
with an internal diameter 25 mm, and then fixed by
soldering and welding.
The elements of injector assembled on
nonmagnetic support and insert with accuracy 0.1 mm.
The vacuum pressure is about 5.10-5 Pa.
The calculation on the beam pass from anode of
a gun to the entrance in the accelerating section and
component placement of injector were performed by the
program PARMELA.
The calculation results for the 120 keV electron
energy and 3 A beam current are present in Fig.1.
Fig.1. The arrangement of elements and beam trajectory
overview.
EG – electron gun, D – deflector, FL – focus lens,
BCT – induction beam current monitor, C - collimator,
B – buncher, MS – magnetic shield, AS – accelerating
structure, FS – focusing solenoid.
ВОПРОСЫ АТОМНОЙ НАУКИ И ТЕХНИКИ. 1999. № 4.
Серия: Ядерно-физические исследования (35), с. 105-106.
105
Fig.2. shows dependencies of the capture
coefficient (ratio between the current at the injector
section exit and the current at the gun exit) when
electrostatic deflector was switched on and was
switched off versus the gun high voltage (current at the
injector section was 0.7 A).
0
10
20
30
40
50
60
70
80
80 85 90 95 100 105 110 115 120
U (kV)
k (%
)
off
on
Fig.2. Dependens capture coefficient into acceleration
vs.of gun high voltage.
Fig.3 shows the pulses of high voltage and beam
current in cases: deflector off or deflector on.
Fig.3. OscIllograms of the high voltage pulses
(curve2; 40 kV/div) and beam current (curve 1; 0,4
A/div) in cases: deflector on (a) and deflector off (b).
Time: 4 µs/div.
SUMMARY
The investigation have shown that the HV diode
guns in combination with the forming system
(collimator, deflector, buncher) are the most suitable for
the use in injector accelerating structures with a high-
power beam. The injector has been assembled with the
linac and has been tested. In 1999 the injector had 1400
hours of operating time without accidents. The main
parameters of the gun were 110 keV and 1.1 A.
REFERENCES
1. A.N.Dovbnya, E.P. Medvedeva, Yu.Tur, et al.
Electron Accelerator’s Production of Technetium-99m
for Nuclear Medicine. // Proceedings of the 1997
Particle Accelerator Conference, Vancouver, B.C.,
Canada, 12-16 May 1997, p. 777-780.
2. V.I.Beloglazov, E.Z.Biller et al., Electron Guns for
Tecnological Linacs // Problems of Atomic Science and
Techn. 1999. v. 4. Issue: Nuclear Physics Researches.
(35), p. .
ВОПРОСЫ АТОМНОЙ НАУКИ И ТЕХНИКИ. 1999. № 4.
Серия: Ядерно-физические исследования (35), с. 105-106.
105
|
| id | nasplib_isofts_kiev_ua-123456789-81539 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 1562-6016 |
| language | English |
| last_indexed | 2025-12-07T15:52:18Z |
| publishDate | 1999 |
| publisher | Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| record_format | dspace |
| spelling | Beloglazov, V.I. Dovbush, L.S. Myakushko, L.K. Otlev, M.V. Reprintsev, L.V. Romasko, V.P. Tur, Yu.D. Vishnyakov, V.A. Zakutin, V.V. 2015-05-17T17:03:34Z 2015-05-17T17:03:34Z 1999 Injector of the linac LU-20 / V.I. Beloglazov, L.S. Dovbush, L.K. Myakushko, M.V. Otlev, L.V. Reprintsev, V.P. Romasko, Yu.D. Tur, V.A. Vishnyakov, V.V. Zakutin // Вопросы атомной науки и техники. — 1999. — № 4. — С. 105-106. — Бібліогр.: 2 назв. — англ. 1562-6016 https://nasplib.isofts.kiev.ua/handle/123456789/81539 The investigation have shown that the HV diode guns in combination with the forming system (collimator, deflector, buncher) are the most suitable for the use in injector accelerating structures with a high-power beam. The injector has been assembled with the linac and has been tested. In 1999 the injector had 1400 hours of operating time without accidents. The main parameters of the gun were 110 keV and 1.1 A. en Національний науковий центр «Харківський фізико-технічний інститут» НАН України Вопросы атомной науки и техники Injector of the linac LU-20 Инжектор линейного ускорителя ЛП-20 Article published earlier |
| spellingShingle | Injector of the linac LU-20 Beloglazov, V.I. Dovbush, L.S. Myakushko, L.K. Otlev, M.V. Reprintsev, L.V. Romasko, V.P. Tur, Yu.D. Vishnyakov, V.A. Zakutin, V.V. |
| title | Injector of the linac LU-20 |
| title_alt | Инжектор линейного ускорителя ЛП-20 |
| title_full | Injector of the linac LU-20 |
| title_fullStr | Injector of the linac LU-20 |
| title_full_unstemmed | Injector of the linac LU-20 |
| title_short | Injector of the linac LU-20 |
| title_sort | injector of the linac lu-20 |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/81539 |
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