The full-scale microwave-stand of LUE-200 accelerator at IREN facility
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| Дата: | 2001 |
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України
2001
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| Назва видання: | Вопросы атомной науки и техники |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | The full-scale microwave-stand of LUE-200 accelerator at iren facility / V.N. Zamrij, V.V. Kobets, А.P. Sumbaev, V.I. Furman, V.A. Shvets // Вопросы атомной науки и техники. — 2001. — № 5. — С. 18-20. — Бібліогр.: 6 назв. — англ. |
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irk-123456789-784032016-04-15T13:41:28Z The full-scale microwave-stand of LUE-200 accelerator at IREN facility Zamrij, V.N. Kobets, V.V. Sumbaev, A.P. Furman, V.I. Shvets, V.A. 2001 Article The full-scale microwave-stand of LUE-200 accelerator at iren facility / V.N. Zamrij, V.V. Kobets, А.P. Sumbaev, V.I. Furman, V.A. Shvets // Вопросы атомной науки и техники. — 2001. — № 5. — С. 18-20. — Бібліогр.: 6 назв. — англ. 1562-6016 PACS number: 29.17.+w http://dspace.nbuv.gov.ua/handle/123456789/78403 en Вопросы атомной науки и техники Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| language |
English |
| format |
Article |
| author |
Zamrij, V.N. Kobets, V.V. Sumbaev, A.P. Furman, V.I. Shvets, V.A. |
| spellingShingle |
Zamrij, V.N. Kobets, V.V. Sumbaev, A.P. Furman, V.I. Shvets, V.A. The full-scale microwave-stand of LUE-200 accelerator at IREN facility Вопросы атомной науки и техники |
| author_facet |
Zamrij, V.N. Kobets, V.V. Sumbaev, A.P. Furman, V.I. Shvets, V.A. |
| author_sort |
Zamrij, V.N. |
| title |
The full-scale microwave-stand of LUE-200 accelerator at IREN facility |
| title_short |
The full-scale microwave-stand of LUE-200 accelerator at IREN facility |
| title_full |
The full-scale microwave-stand of LUE-200 accelerator at IREN facility |
| title_fullStr |
The full-scale microwave-stand of LUE-200 accelerator at IREN facility |
| title_full_unstemmed |
The full-scale microwave-stand of LUE-200 accelerator at IREN facility |
| title_sort |
full-scale microwave-stand of lue-200 accelerator at iren facility |
| publisher |
Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| publishDate |
2001 |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/78403 |
| citation_txt |
The full-scale microwave-stand of LUE-200 accelerator at iren facility / V.N. Zamrij, V.V. Kobets, А.P. Sumbaev, V.I. Furman, V.A. Shvets // Вопросы атомной науки и техники. — 2001. — № 5. — С. 18-20. — Бібліогр.: 6 назв. — англ. |
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Вопросы атомной науки и техники |
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THE FULL-SCALE MICROWAVE-STAND OF LUE-200
ACCELERATOR AT IREN FACILITY
V.N. Zamrij, V.V. Kobets, А.P. Sumbaev, V.I. Furman, V.A. Shvets
Joint Institute for Nuclear Research (JINR)
Dubna, Moscow Region, Russia
PACS number: 29.17.+w
In the Frank Laboratory of Neutron Physics at JINR
the 200 MEV linear electron accelerator (LUE-200) for
a source of resonant neutrons (IREN) is under construc-
tion. It is based on the best world achievements in the
area of accelerator engineering.
The rate of a set of particle energy in LUE will be
35 MeV/m and the pulse repetition rate will be 150 Hz.
In the accelerator the most powerful klystrons such as
5045 class are used. System of capacity multiplication
(SLED), developed for the Stanford electron-positron
collider (SLAC), and modern accelerator sections are
made in the Budker institute for nuclear physics
(Novosibirsk). The research and development work is
carried out in LNPh JINR. The full-scale microwave-
stand klystrons 5045 with the modulator of the maximal
pulse power 150 МW, maximal average power of
150 kW, charging voltage 50 kV, pulse repetition rate of
150 Hz, pulse duration of 5 µs [3] were fabricated.
This paper presents the results of the following
works: development of the microwave-stand systems;
klystron 5045 starting; investigation and upgrading of
the modulator units, and perfection of operating condi-
tions under the project IREN.
The full-scale microwave–stand klystron and modu-
lator for IREN comprise:
- modulator involving a dual forming line with concen-
trated parameters (total capacity of condensers is
2x0.7 µsF and total inductance of adjustable coils of a
L-type in each of unary lines is 45 µsH);
- digital thyratron TGI1-5000/50 ("ISPOLIN"), system
of stabilization of charging voltage;
- klystron 5045 with the pulse transformer BIT [4];
- accelerator section with the system of capacity multi-
plication, waveguide and micro- wave loading;
- vacuum, water cooling, termostabilization, manage-
ment and control systems.
The system of charging voltage stabilization of the
modulator consisting of two basic devices is described
in detail in [4].
The basic attention was given to calculation and
measurement of parameters of a forming line of the
modulator and a charge circuit such as resonant and re-
sistance charge of a forming line, etc in the process of
adjustment of the modulator to be operated on the pulse
transformer klystron and increase of a target voltage of
the modulator up to rating values. There the main disad-
vantages of the modulator were determined as a result
of analysis of its operation such as a large own induc-
tance of condensers of a type THEM – 100-a regular
forming line of the modulator accelerator of the station "
OLIVIN SU". Thus it was established, that the modula-
tor operates in a stable mode on active loading of
4 Ohm down to the rated voltage (23 kV). However, one
was not able to form a small negative emission (5-7%)
which is necessary for tiratron closing at operation on
inductive loading (the raising pulse transformer fails to
be generated BIT).
Further for optimization of the work with the core
KIU-12 used was the technique described in [4]. The
new dual forming line is developed, computed (under
the program Pspice) and mounted. The primary parame-
ters of the forming line are: wave resistance 4 Ohm,
pulse duration 5 µs (at a level 0.1 from amplitude), du-
ration of a pulse flat top 3.5 µs (at a level 0.9). Small in-
duction condensers К75-35 are applied with a nominal
capacity 24 nF, at a voltage 50 kV, which were devel-
oped for the accelerator LIA-30 and are designed for
operation at a frequency up to 50 Hz. The tests of a new
forming line have shown its satisfactory quality when
operation at a frequency up to 50 Hz. The debugging of
the forming line and modulator was carried out as a
whole at the following stages:
1) at a frequency of 2 Hz increase of the pulse voltage
of the modulator up to 85 % of the face value
(working voltage 20 kV, nominal 23.5 kV) and an-
ode voltage of the klystron 320-330 kV, respective-
ly;
2) correction of the pulse form of the modulator with
the dual forming line at a total working voltage for
contraction of fronts and formation of flat top of a
pulse up to 4 µs;
3) smooth transition to the pulse repetition rate of
50 Hz.
Klystron 5045 has fulfilled more than 100 hours in
total. The work proceeded more than 50% of time at the
following parameters: a target voltage of the modulator
23.5 kV and frequency 50 Hz, voltage on the klystron
320–330 kV, complete current klystron 380-400 A, cur-
rent of heat 26 A, current coral bias of BIT 12 A, cur-
rent of the solenoid focussing 14 А.
The tests of the 5045 klystron in a mode of genera-
tion of a microwave - power on the coordinated mi-
crowave - loading are carried out. Loading is connected
through the vacuum waveguide, which consists of:
•Е-, Н- rotary elements;
•Directed beam splitter for measurement of falling and
reflected waves;
•Waveguide vacuum slide gate and means of vacuum
pumping.
The serviceability of a system of preliminary excita-
ВОПРОСЫ АТОМНОЙ НАУКИ И ТЕХНИКИ. 2001. №5.
Серия: Ядерно-физические исследования (39), с. 18-20.
18
tion of the klystron, systems of synchronization, man-
agement and control, measuring devices, as well as the
modulator М350 is checked up as the klystron operates
in a mode of generation of a microwave - capacity.
The working vacuum was achieved under pressure
4.8×10-5 Pа after long heating up to ~ 200°С, before mi-
crowave excitation on the klystron, in a microwave
path.
The voltage on the klystron was increased up to 70%
of the nominal one (from 242 kV to 350 kV) at a pulse
repetition rate of the modulator of 2 Hz. The correction
of a pulse form is carried out at a voltage on the modu-
lator output with changing parameters of a forming line
elements.
The system of preliminary klystron excitation is pre-
pared, assembled and tested for the coordinated loading.
The microwave excitation supply on the klystron in-
put is carried out after overlapping of klystron excitation
pulses and klystron anode voltage controlling by a high-
voltage divider BIT.
The microwave capacity is obtained on the coordi-
nated klystron loading and equals ~ 30 MW when cali-
brating by a curve of the klystron 5045.
The technological part of the termostabilization sys-
tem of the section is mounted. The electronic termosta-
bilization system is developed on the basis of the pro-
grammed controller “906S Eurotherm controls” and 3
powerful tiristor blocks of 425A (3×5.5 kVА). The tests
of the system are carried out and the programs of tem-
perature PID - regulation are optimized. The decrease of
stabilization errors and setting up of the temperature up
to 0.03 – 0.05°С is performed in the process of system
installing for ~ 20 min/°C.
The works on creation of a control system, blocking
and emergency or precautionary signal system (CBS)
are carried out. The development of a logic of the elec-
tronic system for blocking and protection of klystron in-
clusion is executed that supplements opportunities of
the system CBS (or replaces its duplicating relays). The
circuit developed has 3 modes: the control and record of
the emergency data, diagnostics and the signal system,
operative protection and blocking [5]. The system of
computer monitoring of emergency signals CBS is cre-
ated with the purpose of their registration and fast
klystron protection. The module of the system CAMAC
is created for protection and registration of 16 emergen-
cy thresholds, analog parameters (with given control
point for temperature, vacuum, level of currents and
voltage). The module provides fast blocking and protec-
tion of 4 channels on electrophysical parameters. The
automatic switching-off of the start pulse and power
supplies at disruptions in klystron and microwave de-
crease or increase of the anode voltage at pulsations be-
cause of failures in the system of a high-voltage feed
etc. The system of modules provides fast blocking of
pulses of the synchronizer of the start. Now an electron-
ic and relay part of the system (CBS) of the stand "are
sewed".
TESTS OF A PROTOTYPE OF THE ACCEL-
ERATING SECTION
The tests of a prototype of the accelerating structure
(section of 3 m length) are carried out on the preinjector
VEPP-5 at the Budker Institute of Nuclear Physics
(BINP) [6]. The feature of circuit experiments was the
presence of the second, "passive" accelerating section,
the structure of which was loaded on a microwave -
loading, thus the microwave power did not deliver to.
The presence of a "passive" section brings to taking a
significant part of a beam energy and to expansion of an
energy spectrum of the accelerated particles.
The basic results of tests consist in the following:
The average acceleration rate achieves more than
35 MeV/m at acceleration of a beam electrons with a
current of 2.3 A and duration ~ 5 ns.
The power characteristics of the beam accelerated
are worsening at acceleration of a beam electrons with
current and duration parameters close to beam parame-
ters of the LUE-200 accelerator (current 1.5 A, duration
250 ns), the average energy of the beam decreases and
the very wide power spectrum (Fig. 1) is formed.
Comparison of experimental results shows that at the
output power of the klystron 50 МW at optimum bunch-
er adjustment, the average (in a pulse) current of a beam
accelerated in the first section reaches 1.35 A, the maxi-
mal energy of particles in a bunch reaches 105 МeV at a
spectrum width of 30 МeV or 90 МeV at a spectrum
width of 10 МeV.
Comparison of test results with design parameters is
given in Table 1 in recalculation on one accelerating
section.
0 10 20 30 40 50 60 70 80 90 100 110 120
0,00E+000
1,00E+010
2,00E+010
3,00E+010
4,00E+010
5,00E+010
6,00E+010
7,00E+010
8,00E+010
9,00E+010
1,00E+011
1,10E+011
1,20E+011
1,30E+011
1,40E+011
1,50E+011
dNe /dU
U [MeV]
Fig. 1. A power spectrum of accelerated electrons
with varying the time of gun energizing versus the
pulse of microwave capacity.
Table 1
Project
IREN Experiment
Pulse repetition rate
F [Hz] 150 5
Energy quantity of a
beam beamW [D] 40 30
Pulse current of accel-
erated particle beam I0
[A]
1.5 1.35
Klystron power klP 63 50
ВОПРОСЫ АТОМНОЙ НАУКИ И ТЕХНИКИ. 2001. №5.
Серия: Ядерно-физические исследования (39), с. 19-20.
19
[MW]
Maximal energy of a
beam beamU [MeV] 105 100
Duration of a current
pulse bτ [ns] 250 240
As Table 1 indicates, there were no design objec-
tives of the accelerator LUE-200 carried out as a result
of the experiment.
The average current of accelerated particles per a
pulse 0 achieved at present is less by about 90% of the
design one that basically defines shortage of energy
quantity of a beam (~ 75% of the design one).
REFERENCES
1. Status IREN Project // Proc. of the Conf. on Parti-
cle Acc. and High Energy, Texas, Dallas, 1995.
2. S.Dolya et al. Linac LUE-200 Test Facilities //
Proc. of the XIX Int. Linac Conf. LINAC-98, (Au-
gust 23-28, 1998 Chicago Illinois, U.S.A.) v. 1, p.
52-54. ANL, Argonne, Illinois, U.S.A.
3. V.A.Shvets et al. JINR, Р9-96-515, Dubna, 1996.
4. V.A.Shvets. The report on the XVI International
Workshop on Linear Accelerators of Charged Parti-
cles, Alushta, Crimea, 6-12. IX. 1999.
5. V.N.Zamrij // Proc of Internat. Workshop DANEF-
2000. p. 186. JINR, E10-2001-11, Dubna, 2001.
6. Tests of a skilled sample of accelerating section for
the accelerator LUE-200 of installation IREN. Joint
scientific report BINP, RAN, Russia and JINR,
Dubna, 2001.
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