Monitoring channel of the technological linac beam cross-section
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| Date: | 2001 |
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України
2001
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| Series: | Вопросы атомной науки и техники |
| Online Access: | http://dspace.nbuv.gov.ua/handle/123456789/79004 |
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| Cite this: | Monitoring channel of the technological linac beam cross-section / V.N. Boriskin, V.A. Gurin, V.A. Popenko, A.N. Savchenko, V.I. Tatanov // Вопросы атомной науки и техники. — 2001. — № 5. — С. 147-149. — Бібліогр.: 7 назв. — англ. |
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irk-123456789-790042015-03-25T03:02:42Z Monitoring channel of the technological linac beam cross-section Boriskin, V.N. Gurin, V.A. Popenko, V.A. Savchenko, A.N. Tatanov, V.I. 2001 Article Monitoring channel of the technological linac beam cross-section / V.N. Boriskin, V.A. Gurin, V.A. Popenko, A.N. Savchenko, V.I. Tatanov // Вопросы атомной науки и техники. — 2001. — № 5. — С. 147-149. — Бібліогр.: 7 назв. — англ. 1562-6016 PACS numbers: 79.20.Hx http://dspace.nbuv.gov.ua/handle/123456789/79004 en Вопросы атомной науки и техники Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
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Article |
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Boriskin, V.N. Gurin, V.A. Popenko, V.A. Savchenko, A.N. Tatanov, V.I. |
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Boriskin, V.N. Gurin, V.A. Popenko, V.A. Savchenko, A.N. Tatanov, V.I. Monitoring channel of the technological linac beam cross-section Вопросы атомной науки и техники |
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Boriskin, V.N. Gurin, V.A. Popenko, V.A. Savchenko, A.N. Tatanov, V.I. |
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Boriskin, V.N. |
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Monitoring channel of the technological linac beam cross-section |
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Monitoring channel of the technological linac beam cross-section |
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Monitoring channel of the technological linac beam cross-section |
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Monitoring channel of the technological linac beam cross-section |
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Monitoring channel of the technological linac beam cross-section |
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monitoring channel of the technological linac beam cross-section |
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
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2001 |
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Monitoring channel of the technological linac beam cross-section / V.N. Boriskin, V.A. Gurin, V.A. Popenko, A.N. Savchenko, V.I. Tatanov // Вопросы атомной науки и техники. — 2001. — № 5. — С. 147-149. — Бібліогр.: 7 назв. — англ. |
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Вопросы атомной науки и техники |
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2025-07-06T03:07:59Z |
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MONITORING CHANNEL OF THE TECHNOLOGICAL LINAC
BEAM CROSS-SECTION
V.N. Boriskin, V.A. Gurin, V.A. Popenko, A.N. Savchenko, V.I. Tatanov
NSC, KIPT, Kharkov, Ukraine
PACS number: 79.20.Hx
In recent years at the Science Research Complex “Ac-
celerator” of NSC KIPT the power current technological
electron linacs are developed and put into operation.
Their energy varies from 8 MeV to 30 MeV [1], the
pulse current does not exceed 1A and the operating fre-
quency is 150-300 Hz. One accelerating structure linacs,
KUT and LU-10, and two accelerating structure linac
EPOS are used primarily for technological aims. The
technological object zone irradiated by accelerated elec-
trons is created with a magnet scanning system [2]. Irra-
diated samples are situated in the ambient air of a linac
bunker. The wide-aperture magneto-induction transduc-
er is used for position control of the electron beam [3].
A special secondary emission monitor is developed for
the operative control of the beam cross-section at the
linac exit. The monitor signals are used by a linac con-
trol system.
1 CONSTRUCTION OF THE BEAM PRO-
FILE MONITOR
The beam profile monitor consists of three alumini-
um lames of 2 mm width and 0.15 mm thick (Fig. 1).
The series-connected lames are locked in the hetenax
cadre. The spacing of lames is 50 mm. The lame planes
are parallel to one another and perpendicular to the
beam moving plane. In the high-energy electron passage
through the lames, the positive signal with an amplitude
no more than 800 mV comes due to the secondary elec-
tron emission. The beam profile monitor signal by the
RK75 cable 40 m in length is fed to the digitizer entry.
Simplicity of the monitor construction is conditioned by
a high level of induced activated radiation in the work-
ing zone. The employment of the traditional collector
electrode with an accelerating potential was not neces-
sary for electron beams we have used [5, 6]. The beam
profile monitor is installed in the air at 60 mm from the
plane of the scanner exhaust foil.
Fig. 1. The profile monitor structure scheme.
In the air a relationship between a charge on the
beam profile monitor lames and the primary beam inten-
sity can not be linear as a result of deposition of charge
atmosphere particles and secondary electrons with a low
energy on the lames.
A relationship between the total beam profile moni-
tor signal and the primary electron beam intensity was
investigated to the estimate characteristic linearity. In
Figure 2 the channel for measurement of the total moni-
tor signal is shown, the measurement results are given in
Figures 3 and 4. It is shown that in the vicinity of scan-
ner exhaust foil the signal level drops and characteris-
tics very depend on the beam current.
Fig. 2. Structure schematic of the channel for measure-
ment of the total beam profile monitor signal:
R - matching resistance in the end of the coaxial cable,
RL - resistance RK75 cable, РС - personal computer,
ADC - digitizer.
Fig. 3. Videogram of the total beam profile monitor
signal measurement (pulse train at the top of
videogram).
ВОПРОСЫ АТОМНОЙ НАУКИ И ТЕХНИКИ. 2001. №5.
Серия: Ядерно-физические исследования (39), с. 147-149.
147
(1)
3
3.1
3.2
3.3
0 500 1000
Ip(mA)
K
em
(%
)
(2)
3
3.1
3.2
3.3
0 500 1000
Ip(mA)
K
em
(%
)
(3)
2.2
2.7
3.2
0 500 1000
Ip(mA)
K
em
(%
)
Fig. 4. Secondary emission coefficient (in %) versus
pulse beam current IP (in mA) and the distance (h)
between the monitor plane and scanner exhaust foil.
(1) h=125 mm, (2) h= 65 mm, (3) h=2 mm. Electron
energy is equal to 7-11 МeV.
2 MONITORING SECTION AND POSI-
TION OF THE ELECTRON BEAM
At our linacs in the plane of the beam profile moni-
tor, the cross-section diameter (D) of the electron beams
used for process of target irradiation ranges up to about
10-15 mm and the distance between the centers of the
beam deflected by the scanner at the extreme positions
may be equal to 100-150 mm. As an excitation current
of the scanner magnet changes linearly, the average val-
ue of beam center movement (R) within the span of two
linac pulses is defined by the relation
R = 2 FS S/Fr,
where FS is the change frequency of the deflecting scan-
ner excitation current,
S is the beam center movement swing,
Fr is the frequency of linac current pulses.
For our case R is equal to 2 – 4 mm. Based on this
the lame width of 2 mm was selected. Figure 5 and Fig-
ure 6 show the results of monitoring the beam position
and the section at the linac EPOS. The signal amplitudes
from the middle lame allows to estimate a beam section
along the axis of the beam center movement. With the
known distance between the first and last lames and the
linac pulse value between the first and last signals from
these lames, one can determine the beam center move-
ment swing.
Fig. 5. Videogram of profile monitor signals and
signals of magneto-induction transducer of position.
0
500
1000
1500
2000
2500
3000
3500
1 6 11 16 21 26 31 36 41 46 51 56 61 66 71 76 81 86 91 96 101106111 116 121126
Fig. 6. The total values of the signals induced by the
electron scanning beam into the magneto-induction
transducer of position (saw-tooth signal) and into
the beam profile monitor. The pulse beam current,
pulse frequency and scanning frequency of the linac
“EPOS” were equal to 760 mA, 200 Hz and 3 Hz
respectively.
The familiar X-shaped construction of the beam pro-
file monitor [7] is used for two-dimension beam profile
control (Fig. 7).
Fig. 7. Structure schematic for two-dimension beam
148
profile measurement.
The results of two-dimension beam profile control in
the linac “EPOS” are presented in Fig. 8.
0
0.02
0.04
0.06
0.08
0.1
0.12
0.14
0.16
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
n
Fig. 8. The plots of two-dimension beam profile
changing in the linac “EPOS”.
For the described measuring channel the measure-
ment error of the beam profile and position is deter-
mined chiefly by the ratio of D, S and R quantities. For
our case the error is no better than 20 %.
Summary. The on-line channel for measurement of the
beam profile and of the beam position has been in suc-
cessful operation for over two years as a part of the
linac “EPOS” control system. Authors are grateful to
M.I. Aizatsky, A.N. Dovbnya, V.A. Kushnir and
V.L. Uvarov for helpful discussion.
REFERENCES
1. A.N.Dovbnya et al. Electron Linacs Based Radia-
tion Facilities of Ukrainian National Science Center
KIPT // Bulletin of the American Physical Society.
May 1997, v. 42, No. 3, p. 1391.
2. A.N.Dovbnya et al. The Output Beam Scanning
and Forming in the Multipurpose Electron Acceler-
ators of KIPT // Voprosy Atomnoj Nauki i Tekhniki.
Seriya: Yadernaya Fizika (28). 1997, v. 1, p. 114-
121 (in Russian).
3. V.N.Boriskin, A.N.Savchenko, V.I.Tatanov et al.
Monitoring of the Electron Beam Position in Indus-
trial Linacs // Proc PAC’99. 1999, v. 2, p. 753-755.
4. Yu.I.Akchurin, V.N.Boriskin, N.N.Bahmetev et al.
Control System for Technological Linacs // Prob-
lems of Atomic Science and Technology. Issue: Nu-
clear-Physics Research (34). 1999, v. 3, p. 55-57.
5. E.A.Merker. Equipment for precision coordinates
and form measurement of the released proton beam
// Pribory i tekhnika ehksperimenta. 1975, v. 6,
p. 25-27 (in Russian).
6. V.A.Golshteyn, V.G.Vlasenko, S.V.Dementij et al.
Research of the secondary emission monitors on
the LAE-2000 electron beam. Preprint KIPT 72-14,
Kharkov, 1972, p. 27 (in Russian).
7. V.A.Moskalev, G.I.Sergeev, V.G.Shestakov. Mea-
surement of charged particle beam parameters.
Moscow: Atomizdat, 1980, 156 p (in Russian).
ВОПРОСЫ АТОМНОЙ НАУКИ И ТЕХНИКИ. 2001. №5.
Серия: Ядерно-физические исследования (39), с. 149-149.
149
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