HIBP diagnostic for Uragan-2M stellarator
The project of the Heavy Ion Beam Probe (HIBP) plasma diagnostic system for stellarator Uragan-2M is presented. The device Uragan-2M is the flexible torsatron machine with small helical ripples and considerably high size and magnitude of the magnetic field (R = 170 cm, ape = 22 , B0 = 0.8…2.4 T, l...
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України
2009
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| Цитувати: | HIBP diagnostic for Uragan-2M stellarator / I.S. Bondarenko, A.A. Chmyga, G.N. Deshko, A.D. Komarov, A.S. Kozachok, L.I. Krupnik, S.M. Khrebtov, A.I. Zhezhera // Вопросы атомной науки и техники. — 2009. — № 1. — С. 40-42. — Бібліогр.: 2 назв. — англ. |
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irk-123456789-882182015-11-10T03:02:12Z HIBP diagnostic for Uragan-2M stellarator Bondarenko, I.S. Chmyga, A.A. Deshko, G.N. Komarov, A.D. Kozachok, A.S. Krupnik, L.I. Khrebtov, S.M. Zhezhera, A.I. Магнитное удержание The project of the Heavy Ion Beam Probe (HIBP) plasma diagnostic system for stellarator Uragan-2M is presented. The device Uragan-2M is the flexible torsatron machine with small helical ripples and considerably high size and magnitude of the magnetic field (R = 170 cm, ape = 22 , B0 = 0.8…2.4 T, l = 2, m = 4). Necessary calculations by using the computer code made in HIBP group to optimize HIBP diagnostic set for stellarator Uragan-2M Представлено проект системи діагностики зондування плазми пучком важких іонів (ЗППВІ) для стеларатора Ураган-2М. Установка Ураган-2М являє собою гнучкий торсатрон з малими гелікоїдальними гофрами, з великими розмірами й величиною магнітного поля (R = 170 см, ape = 22 см, B0 = 0.8...2.4 T, l = 2, m = 4). З метою оптимізації параметрів діагностичного пристрою для стеларатора Ураган-2М проведено розрахунки з використанням комп’ютерних програм, які були розроблені групою ЗППВІ- діагностики. Представлен проект системы диагностики зондирования плазмы пучком тяжелых ионов (ЗППТИ) для стелларатора Ураган-2М. Установка Ураган-2М представляет собой гибкий торсатрон с малыми геликоидальными гофрами, с большими размерами и величиной магнитного поля (R = 170 см, ape = 22 см, B0 = 0.8...2.4 T, l = 2, m = 4). С целью оптимизации параметров диагностического устройства для стелларатора Ураган-2М проведены расчеты с использованием компьютерных программ, разработанных в группе ЗППТИ- диагностики. 2009 Article HIBP diagnostic for Uragan-2M stellarator / I.S. Bondarenko, A.A. Chmyga, G.N. Deshko, A.D. Komarov, A.S. Kozachok, L.I. Krupnik, S.M. Khrebtov, A.I. Zhezhera // Вопросы атомной науки и техники. — 2009. — № 1. — С. 40-42. — Бібліогр.: 2 назв. — англ. 1562-6016 PACS: 52.70.Nc http://dspace.nbuv.gov.ua/handle/123456789/88218 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 |
| topic |
Магнитное удержание Магнитное удержание |
| spellingShingle |
Магнитное удержание Магнитное удержание Bondarenko, I.S. Chmyga, A.A. Deshko, G.N. Komarov, A.D. Kozachok, A.S. Krupnik, L.I. Khrebtov, S.M. Zhezhera, A.I. HIBP diagnostic for Uragan-2M stellarator Вопросы атомной науки и техники |
| description |
The project of the Heavy Ion Beam Probe (HIBP) plasma diagnostic system for stellarator Uragan-2M is presented. The
device Uragan-2M is the flexible torsatron machine with small helical ripples and considerably high size and magnitude
of the magnetic field (R = 170 cm, ape = 22 , B0 = 0.8…2.4 T, l = 2, m = 4). Necessary calculations by using the
computer code made in HIBP group to optimize HIBP diagnostic set for stellarator Uragan-2M |
| format |
Article |
| author |
Bondarenko, I.S. Chmyga, A.A. Deshko, G.N. Komarov, A.D. Kozachok, A.S. Krupnik, L.I. Khrebtov, S.M. Zhezhera, A.I. |
| author_facet |
Bondarenko, I.S. Chmyga, A.A. Deshko, G.N. Komarov, A.D. Kozachok, A.S. Krupnik, L.I. Khrebtov, S.M. Zhezhera, A.I. |
| author_sort |
Bondarenko, I.S. |
| title |
HIBP diagnostic for Uragan-2M stellarator |
| title_short |
HIBP diagnostic for Uragan-2M stellarator |
| title_full |
HIBP diagnostic for Uragan-2M stellarator |
| title_fullStr |
HIBP diagnostic for Uragan-2M stellarator |
| title_full_unstemmed |
HIBP diagnostic for Uragan-2M stellarator |
| title_sort |
hibp diagnostic for uragan-2m stellarator |
| publisher |
Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| publishDate |
2009 |
| topic_facet |
Магнитное удержание |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/88218 |
| citation_txt |
HIBP diagnostic for Uragan-2M stellarator / I.S. Bondarenko, A.A. Chmyga, G.N. Deshko, A.D. Komarov, A.S. Kozachok, L.I. Krupnik,
S.M. Khrebtov, A.I. Zhezhera // Вопросы атомной науки и техники. — 2009. — № 1. — С. 40-42. — Бібліогр.: 2 назв. — англ. |
| series |
Вопросы атомной науки и техники |
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40 PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY. 2009. № 1.
Series: Plasma Physics (15), p. 40-42.
HIBP DIAGNOSTIC FOR URAGAN-2M STELLARATOR
I.S. Bondarenko, A.A. Chmyga, G.N. Deshko, A.D. Komarov, A.S. Kozachok, L.I. Krupnik,
S.M. Khrebtov, A.I. Zhezhera
Institute of Plasma Physics, National Science Center
“Kharkov Institute of Phisics and Technology”, Kharkov, Ukraine
The project of the Heavy Ion Beam Probe (HIBP) plasma diagnostic system for stellarator Uragan-2M is presented. The
device Uragan-2M is the flexible torsatron machine with small helical ripples and considerably high size and magnitude
of the magnetic field (R = 170 cm, ape = 22 , B0 = 0.8…2.4 T, l = 2, m = 4). Necessary calculations by using the
computer code made in HIBP group to optimize HIBP diagnostic set for stellarator Uragan-2M.
PACS: 52.70.Nc
1. INTRODUCTION
The Heavy Ion Beam Probing (HIBP) diagnostics is
known as a unique tool for the direct contactless
measurements of plasma electric field potential. Its ability
to measure plasma density, temperature and plasma
current profile distribution is well known also.
The operation of the HIBP is based on the injection of
primary single-charged ion beam into the plasma across
the maintaining magnetic field and the registration of the
double-charged secondary particles, born due to the
collisions with plasma electrons. The region of secondary
ionization in plasma, called the sample volume, is the
local point of the plasma potential measurements. Position
and size of the sample volume are determined by
calculation of the trajectories of probing particles.
The project of the HIBP plasma diagnostic system for
stellarator Uragan-2M is presented in this work.
Heavy ion beam probe (HIBP) diagnostic is the most
attractive of non-contacting methods, which are not
influencing on the plasma parameters and allows to obtain
information about space distribution of the plasma electric
potential φ, plasma density ne, electron temperature Te
and poloidal magnetic field Bθ (or axial current) in the
plasma bulk. This method is based on the changing of the
primary ion beam parameters (charge, intensity and
pathway) when it goes through a plasma volume because
of collisions with electrons (mostly) and interaction with a
confining magnetic field.
Necessary calculations with using the computer code
was made in order to optimize HIBP diagnostic set for
stellerator Uragan-2M.
2. CALCULATIONS
There are physical limitations of HIBP measurements
for all plasma cross-section consisting in that the ions’
Larmor radius should be larger than radius of magnetic
field confined area. Besides, there are geometrical
limitations, which are determined by design of vacuum
chamber (arrangement of entrance and exit ports),
arrangement of magnetic coils, bearings and already
installed diagnostic equipment. They greatly narrow down
the size of investigated area in plasma.
The device Uragan-2M (Fig. 1) was constructed about
1991. It is the flexible torsatron with small helical ripples
and considerably high parameters (R = 170 cm, ape =
22 cm, B0 = 0,8…2.4 T, l = 2, m = 4). It was put to
operation at the end of 2006.
First calculations for HIBP applications were made at the
end of 1980-th [1]. Calculations by modern computer
code was made in order to optimize HIBP diagnostic set
for stellerator Uragan-2M. Determination of position and
size of studied area in the plasma is possible only by a
computational way. First, the magnetic field was
calculated for a special 3-dimensional grid that covers
some of the stellarator working volume. The resulting
magnetic field from all magnetic elements of Uragan-2M
stellarator was used for a calculation of primary and
secondary ions’ trajectories.
The system of equations for particles motion in
electromagnetic field was solved by the Runge-Kutta
method with certain accuracy.
Many variants of injector and detector placement were
analyzed using different installation positions and angles
in order to comply the HIBP diagnostics with existing
Uragan-2M stellarator equipment.
The trajectory optimization aiming for the maximal
plasma observation was done for chosen port
combinations.
The special beam-lines for the primaries and the
secondaries are necessary to transfer the particles from
the accelerator to plasma through the area of magnetic
field and further to ion energy analyzer. They are also
necessary to control the beam trajectory and drive them
to energy analyzer with optimized entrance angle. Such
electrostatic control looks to be the necessary elements
of the HIBP hardware for stellarators like Uragan-2M.
The calculations of the trajectories were made for
singly charged cesium and thallium (Cs+ and Tl+)
primary ions in the energy range from 150 to 950 keV.
Uragan-2M HIBP project uses entrance port 12 for an
injection of primary ion beam inside the plasma vessel
and exit port 15 for a detection of the secondary ions
beams, coming out from the plasma. These ports are
placed on a toroidal angle φ = 54o and are almost opposite
to each other (Fig.2). Two variants of HIBP diagnostic for
different magnetic field values were calculated. At the
first stage of the stellarator’s operation the Uragan-2M
toroidal magnetic field will be 0.8 T (Fig. 3), at the
second stage – up to 2.4 T. Detector grid that was
calculated for the first stage covers quite large area of the
plasma (Fig. 4). It is possible to get the plasma potential
profile by fast electrostatic deflection scanning system in
the range of 0.1<ρ<1 with the help of Tl+ beam of
41
150 keV. For the second stage it will be necessary to
increase the Tl+ beam energy up to 950 keV.
Six types of electrostatic deflection plates of primary
and secondary beam-lines were used in calculation for
scanning and correcting the beam motion.
Fig. 1. Uragn-2M device.
Large radius R=1.7 m, averaged plasma radius –
ape = 22 , toroidal magnetic field – B0 ≤ 2.4 Т
Fig.2. HIBP ports
Fig.3. HIBP system for Uragan-2M stellarator
3. HIBP CONSTRUCTION
On the basis of trajectories calculations the
diagnostic complex which consists from injector,
diagnostic tube, primary and secondary beam-lines, the
analyzer, has been developed. The high-voltage power
supply has been developed for a feed of injector and an
accelerating tube with a voltage up to 200 kV and a
current 1 mA (Fig.5, 6). Industrial power supply IVN-100
(Fig. 7) (100 kV, 1 mA) is used for a feed of the analyzer.
Fig. 4. Calculated detector grid for, B0 = 0.8 T,
E beam= 150 kV, Tl+ ions
Fig. 5. 200 kV, 1 mA power supply
Fig. 6. Power supply control unit
4. VACUUM TEST-DEVICE
Vacuum stand “HIBP-U-2M” is created for carrying
out of adjustment and tests of the diagnostic complex
(Fig. 8). The stand represents the vacuum chamber (a
breadboard model of 1/9 parts of the stellarator toroidal
vacuum chamber) with measurement, control and vacuum
systems.
42
Fig. 7. IVN-100 power supply (100 кV, 1 mA)
Fig. 8. Vacuum stand construction
5. CONCLUSIONS
The applicability of the HIBP for the Uragan-2M
stellarator is described. It is possible to use such diagnostics
for local plasma electric field potential measurements.
The necessary voltages on the primary ion beam
accelerator, energy analyzer and deflecting plates are
acceptable. The Uragan-2M HIBP system will be consists
of two main parts. The first of them is the injector of the
accelerated probing beam, consists of:
- Cs+ or Tl+ ion source with ion current up to 500 µA;
- accelerator tube up to 1 MeV with extractor and
focusing systems;
- primary beam-line.
The second part of the HIBP system is detection hardware
for secondary ions registration. It includes:
- traditional energy parallel plate analyzer up to
200keV;
- multi cell array detector;
- secondary beam-line.
These diagnostic system components were used in
particular, in HIBP system of TJ-II stellarator [2]. The
energy beam operation at the first stage of HIBP
operations at Uragan-2M stellarator will be with up to
150keV energy beams, at the second stage – up to 900
keV. All parts of diagnostic set up should be tested on
separate device and installed on stellarator.
Work is carried out according to the contract N 35/20-
2008 according to competition of joint scientific projects
NAS of Ukraine and the Russian fund of basic researches
and decision of Presidium of NAS of Ukraine from
02.04.2008, N 104 and INTAS Grant N 05-1000008-
8046.
REFERENCES
1. V.E. Bykov, L.I. Krupnik, A.V. Melnikov,
I.S. Nedzelskij, N.V. Samohvalov, A.V. Khodyachih,
B.A. Shevchuk. Calculation of trajectories of heavy ion
probe beams in stellarator type instulations “Uragan-2”,
“Uragan-3” and “Uragan-2M”: Preprint. Kharkov:
KIPT AS USSR, KIPT 88-9, 1988.
2 I.S. Bondarenko, S.M. Khrebtov, L.I. Krupnik,
I.S. Nedzelskij, O.A. Gordeev, N.V. Kharchev,
A.V. Melnikov, K.N. Tarasyan, C. Hidalgo, I. Garcia-
Cortes. Heavy ion beam probe diagnostics on TJ-1
tokamak and the measurements of the plasma potential
and density profiles // Rev. Sci. Instrum. 1997, v. 68, N 1.
Article received 1.10.08
ЗППТИ ДИАГНОСТИКА ДЛЯ СТЕЛЛАРАТОРА УРАГАН-2М
И.С. Бондаренко, А.А. Чмыга, Г.Н. Дешко, А.Д. Комаров, А.С. Козачек, Л.И. Крупник, С.М. Хребтов, А.И. Жежера
Представлен проект системы диагностики зондирования плазмы пучком тяжелых ионов (ЗППТИ) для
стелларатора Ураган-2М. Установка Ураган-2М представляет собой гибкий торсатрон с малыми
геликоидальными гофрами, с большими размерами и величиной магнитного поля (R = 170 см, ape = 22 см, B0 =
0.8...2.4 T, l = 2, m = 4). С целью оптимизации параметров диагностического устройства для стелларатора
Ураган-2М проведены расчеты с использованием компьютерных программ, разработанных в группе ЗППТИ-
диагностики.
ЗППВІ ДІАГНОСТИКА ДЛЯ СТЕЛАРАТОРУ УРАГАН-2М
І.С. Бондаренко, О.О. Чмига, Г.М. Дешко, О.О. Комаров, О.С. Козачек, Л.І. Крупнік, С.М. Хребтов, О.І. Жежера
Представлено проект системи діагностики зондування плазми пучком важких іонів (ЗППВІ) для стеларатора
Ураган-2М. Установка Ураган-2М являє собою гнучкий торсатрон з малими гелікоїдальними гофрами, з
великими розмірами й величиною магнітного поля (R = 170 см, ape = 22 см, B0 = 0.8...2.4 T, l = 2, m = 4). З
метою оптимізації параметрів діагностичного пристрою для стеларатора Ураган-2М проведено розрахунки з
використанням комп’ютерних програм, які були розроблені групою ЗППВІ- діагностики.
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