Creation, accumulation and confinement of non-neutral plasmas in stellarator magnetic configuration
The experiments on creation, accumulation and confinement of non-neutral plasma in stellarator system are performed in Institute of Plasma Physics, NSC KIPT. The main goals of these studies are to investigate the behavior of non-neutral plasma in stellarator magnetic configurations, to compare trans...
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| Date: | 2005 |
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України
2005
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| Cite this: | Creation, accumulation and confinement of non-neutral plasmas in stellarator magnetic configuration / Е.D. Volkov, А.А. Petrushenya, I.K. Tarasov, A.B. Batrakov, Yu.F. Lonin, N.I. Rudnev // Вопросы атомной науки и техники. — 2005. — № 2. — С. 38-39. — Бібліогр.: 9 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1860084260574068736 |
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| author | Volkov, Е.D. Petrushenya, A.A. Tarasov, I.K. Batrakov, A.B. Lonin, Yu.F. Rudnev, N.I. |
| author_facet | Volkov, Е.D. Petrushenya, A.A. Tarasov, I.K. Batrakov, A.B. Lonin, Yu.F. Rudnev, N.I. |
| citation_txt | Creation, accumulation and confinement of non-neutral plasmas in stellarator magnetic configuration / Е.D. Volkov, А.А. Petrushenya, I.K. Tarasov, A.B. Batrakov, Yu.F. Lonin, N.I. Rudnev // Вопросы атомной науки и техники. — 2005. — № 2. — С. 38-39. — Бібліогр.: 9 назв. — англ. |
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| container_title | Вопросы атомной науки и техники |
| description | The experiments on creation, accumulation and confinement of non-neutral plasma in stellarator system are performed in Institute of Plasma Physics, NSC KIPT. The main goals of these studies are to investigate the behavior of non-neutral plasma in stellarator magnetic configurations, to compare transport in neutral and non-neutral plasmas, as well as to study the possibility of plasma confinement modification by active control of radial electric fields.
Експерименти по створенню, накопиченню та утриманню нескомпенсованої плазми проводяться в Інституті фізики плазми ННЦ ХФТІ. Головні цілі цих досліджень складаються у вивченні поводження неcкомпенсованої плазми у стеллараторних магнітних конфігураціях, а також у вивченні можливості модифікації утримання плазми шляхом активного керування радіальними електричними полями.
Эксперименты по созданию, накоплению и удержанию нескомпенсированной плазмы проводятся в Институте физики плазмы ННЦ ХФТИ. Главные цели этих исследований состоят в изучении поведения нескомпенсированной плазмы в сталлараторных магнитных конфигурациях, а также в изучении возможности модификации удержания плазмы путем активного управления радиальными электрическими полями.
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| first_indexed | 2025-12-07T17:18:33Z |
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CREATION, ACCUMULATION AND CONFINEMENT OF NON-NEUTRAL
PLASMAS IN STELLARATOR MAGNETIC CONFIGURATION
Е.D. Volkov, А.А. Petrushenya, I.K. Tarasov, A.B. Batrakov, Yu.F. Lonin, N.I. Rudnev
IPP NSC KIPT, Akademicheskaya Str.1, Kharkov, 61108, Ukraine,
e-mail: a.petrushenya@ipp.kharkov.ua
The experiments on creation, accumulation and confinement of non-neutral plasma in stellarator system are performed
in Institute of Plasma Physics, NSC KIPT. The main goals of these studies are to investigate the behavior of non-neutral
plasma in stellarator magnetic configurations, to compare transport in neutral and non-neutral plasmas, as well as to
study the possibility of plasma confinement modification by active control of radial electric fields.
PACS: 52.55.-s
1. INTRODUCTION
At present, the helical toroidal magnetic traps, most
notable as the tokamaks and the stellarators, are the most
successful plasma confinement devices for future fusion
reactors. Economically acceptable fusion reactors requires
steady-state and high-confinement plasma performances of
such devices. Unfortunately, the presence of plasma
electrostatic and magnetic turbulences causes the plasma
confinement degradation and the heat conduction to be
anomalously high. However, over last decade, in many helical
type devices it has been observed that the turbulences are
reduced in the so-called regimes with improved confinement
(H-modes). Progress in the study of plasma turbulence and
transport have shown that mechanisms which control the
generation of the radial electric fields (Er) and the Er x B
sheared flows to play a key role in formation of transport
barriers leading to improvement of plasma confinement in H-
modes [1]. Since radial electric fields can affect both
anomalous and neoclassical transport, the development of
methods to control the generation of electric fields is a very
promising area of researches for modifying confinement in
helical type devices [2]. Biasing electrodes [3] or limiters [4] is
one of the methods used both in tokamak and stellarator
devices to externally generate electric fields with the aim of
achieving improved confinement modes of operation. The
principal drawback of this technique, especially in high edge
temperature devices, is the increased risk of radiation collapse
due to either a massive entrance of impurities or to an increase
in the impurity confinement time [5]. The other possible way
to control the radial electric field is to change the plasma
neutrality by injection of high energy electrons into plasma
core. However, it is not easy to bring electrons into core region
across a strong toroidal magnetic field. According to previous
studies in tokamaks it is necessary to introduce an additional
ripple magnetic field in order to transport electrons into core
region along ripple trapped drift orbits [6]. On contrary, in case
stellarators for electron injection, it is possible to utilized the
existing loss cone orbit, which has reversible characteristic, to
launch helically trapped particles from outside of the magnetic
confinement volume and then transform them into blocked
particles in the center of the confinement volume [7].
In addition to the studies in the context of thermonuclear
fusion, more recently stellarators have become of interest as
confinement devices for low density non-neutral plasmas [8].
Since stellarators confine plasmas over the full range of
neutrality, from pure electron to quasineutral, they have unique
advantages for laboratory confinement of positron plasmas,
non-neutral electron plasmas, and antiproton – positron plasmas.
2. OBJECTIVES
The main objectives of the present project are to develop
and to investigate a several possible methods of non-neutral
plasma creation and radial electric field generation in
stellarator magnetic configuration, to study the accumulation
and confinement of externally injected charged particles
within the confinement region of stellarator, to investigate
the non-neutral plasma instabilities and turbulences as well
as their influence on plasma losses across magnetic field, to
investigate the possibility of plasma confinement
modification by active control of radial electric fields, to
compare the confinement of neutral ECRH (Electron
Cyclotron Resonance Heated) plasma, non-neutral plasma
created by electron injection, and ECRH plasma plus
electron injection.
3. EXPERIMENTAL SET-UP
The experiments will be carried out in the small l = 2
stellarator (Bo = 0.09 T, R = 0.42 m, a = 0.04 m). The
experimental set-up is schematically shown in Fig.1.
Fig.1. Schematic of an experimental set-up:
1 – stainless steal vacuum chamber, 2 – antenna of
magnetron source, 3 – anode electrode, 4 – electron
injector, 5 – heated cathodes, 6 – diagnostics probes, 7 –
horn antennas of radiofrequency diagnostics, 8 – cross
section of magnetic surfaces
The set-up includes four main parts: toroidal stainless
steal chamber placed in stellarator magnetic configuration,
magnetron source (f = 2.45 GHz) for ECRH plasma
production, high energy electron injectors for non-neutral
plasma creation and diagnostic equipment. To create the
non-neutral plasma in close magnetic configuration of
stellarator it is supposed to use a several methods of electron
injection, as follows: electron injection from heated cathodes
38 Problems of Atomic Science and Technology. Series: Plasma Physics (11). 2005. № 2. P. 38-39
4
1
3
2
5
6
5
5
5
5
8
7
A
A
placed in edge confinement region; electron injection from
auxiliary reflective discharge initiated not far from
confinement region and electron injection through stellarator
divertor. In run of experiments it is supposed to find
experimentally the best points of electron injection into
confinement region of stellarator, as well as to compare
efficiency of varies methods of electron injection. The
confinement of neutral ECRH plasma, non-neutral plasma
created by electron injection, and ECRH plasma plus
electron injection will be compared using microwave
reflectometry. The radial profiles of electron temperature,
plasma potential and density, as well as the fluctuations in
plasma density and potential in plasma core and periphery
will be measured by probe diagnostics. The charged particle
flows, particle energy and their losses across magnetic field
to will be studied by movable electrostatic analyzers.
4. PRELIMINARY EXPERIMENTS
IN NSC KIPT
We have a large experience on electron injection into
toroidal magnetic configurations. In our preliminary
experiments [9] we have obtained and confined the non-
neutral plasma in toroidal magnetic configuration at the
expense of a high energy electron injection through toroidal
divertor. The divertor cell for electron injection into toroidal
magnetic configuration is shown schematically in Fig.2.
Fig.2. Schematic of the divertor cell:
А – separatrix, B - high-voltage electrodes
The parameters of the non-neutral plasma entrapped
were: the plasma density - 1011 < No <1013 см –3, the
electron temperature - Те ≈ 10-20 eV and the ion
temperature Тi ~50 eV.
The oscillogram of (a) X-radiation and plasma
potential, (b) the distribution of plasma potential along
cross section of toroidal chamber and (c) the fluorogram
of the cross section were shown in fig.3, respectively.
а b
c
Fig.3. (a) the oscillogram of X-radiation and plasma
potential, (b) the distribution of plasma potential along
cross section of toroidal chamber and (c) the fluorogram
of the cross section
5. CONCLUSION
Here we have presented the project of investigations on
creation, accumulation and confinement of non-neutral
plasmas in stellarator magnetic configuration. We suppose the
results will be obtained can be used to create the non-neutral
plasma and to control the radial electric fields in a large
stellarator installations, for example such as URAGAN-3M
and URAGAN-2M. Also, these experiments can be useful for
the better understanding of behavior of non-neutral plasma in
stellarator magnetic configurations, transport mechanisms,
transport barrier formation and triggering of enhanced
confinement regimes in helical type devices.
REFERENCES
1. K. Burrel. // Phys. Plasma, 1997, No.4, p.1499.
2. M.A. Pedrosa et al. // Proc. 14th International Stellarator
Workshop, Greifswald, 2003.
3. R.J. Taylor et al. // Phys. Rev. Lett., 1989, v 63, p.2365.
4. T. Uckan et al. // Nucl. Fusion (34). 1995, p.296.
5. K.J. McCarthy et al. // Proc. 14th International Stellarator
Workshop, Greifswald, 2003.
6. W. Choe et al. // Nucl. Fusion (36). 1996, p.1703.
7. O. Motojima et al. // Nucl. Fusion (40) 2000, p.833.
8. T.S. Pedersen et al. //Phys. Rev. Let.(88). 2002, p.205002.
9. V.G. Zykov et al. // J. Tech. Phys.(52). 1982, N 3, p.1223.
СОЗДАНИЕ, НАКОПЛЕНИЕ И УДЕРЖАНИЕ НЕСКОМПЕНСИРОВАННОЙ ПЛАЗМЫ
В СТЕЛЛАРАТОРНОЙ МАГНИТНОЙ КОНФИГУРАЦИИ
Е.Д. Волков, А.А. Петрушеня, И.К. Тарасов, А.Б. Батраков, Ю.Ф. Лонин, Н.И. Руднев
Эксперименты по созданию, накоплению и удержанию нескомпенсированной плазмы проводятся в Институте
физики плазмы ННЦ ХФТИ. Главные цели этих исследований состоят в изучении поведения нескомпенсированной
плазмы в сталлараторных магнитных конфигурациях, а также в изучении возможности модификации удержания
плазмы путем активного управления радиальными электрическими полями.
СТВОРЕННЯ, НАКОПИЧЕННЯ ТА УТРИМАННЯ НЕСКОМПЕНСОВАНОЇ ПЛАЗМИ
У СТЕЛЛАРАТОРНІЙ МАГНІТНІЙ КОНФІГУРАЦІЇ
Е.Д. Волков, А.А. Петрушеня, І.К. Тарасов, А.Б. Батраков, Ю.Ф. Лонін, М.І. Руднев
Експерименти по створенню, накопиченню та утриманню нескомпенсованої плазми проводяться в Інституті фізики
плазми ННЦ ХФТІ. Головні цілі цих досліджень складаються у вивченні поводження неcкомпенсованої плазми у
39
стеллараторних магнітних конфігураціях, а також у вивченні можливості модифікації утримання плазми шляхом
активного керування радіальними електричними полями.
40
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| id | nasplib_isofts_kiev_ua-123456789-79339 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 1562-6016 |
| language | English |
| last_indexed | 2025-12-07T17:18:33Z |
| publishDate | 2005 |
| publisher | Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| record_format | dspace |
| spelling | Volkov, Е.D. Petrushenya, A.A. Tarasov, I.K. Batrakov, A.B. Lonin, Yu.F. Rudnev, N.I. 2015-03-31T13:35:21Z 2015-03-31T13:35:21Z 2005 Creation, accumulation and confinement of non-neutral plasmas in stellarator magnetic configuration / Е.D. Volkov, А.А. Petrushenya, I.K. Tarasov, A.B. Batrakov, Yu.F. Lonin, N.I. Rudnev // Вопросы атомной науки и техники. — 2005. — № 2. — С. 38-39. — Бібліогр.: 9 назв. — англ. 1562-6016 PACS: 52.55.-s https://nasplib.isofts.kiev.ua/handle/123456789/79339 The experiments on creation, accumulation and confinement of non-neutral plasma in stellarator system are performed in Institute of Plasma Physics, NSC KIPT. The main goals of these studies are to investigate the behavior of non-neutral plasma in stellarator magnetic configurations, to compare transport in neutral and non-neutral plasmas, as well as to study the possibility of plasma confinement modification by active control of radial electric fields. Експерименти по створенню, накопиченню та утриманню нескомпенсованої плазми проводяться в Інституті фізики плазми ННЦ ХФТІ. Головні цілі цих досліджень складаються у вивченні поводження неcкомпенсованої плазми у стеллараторних магнітних конфігураціях, а також у вивченні можливості модифікації утримання плазми шляхом активного керування радіальними електричними полями. Эксперименты по созданию, накоплению и удержанию нескомпенсированной плазмы проводятся в Институте физики плазмы ННЦ ХФТИ. Главные цели этих исследований состоят в изучении поведения нескомпенсированной плазмы в сталлараторных магнитных конфигурациях, а также в изучении возможности модификации удержания плазмы путем активного управления радиальными электрическими полями. en Національний науковий центр «Харківський фізико-технічний інститут» НАН України Вопросы атомной науки и техники Magnetic confinement Creation, accumulation and confinement of non-neutral plasmas in stellarator magnetic configuration Створення, накопичення та утримання нескомпенсованої плазми у стеллараторній магнітній конфігурації Создание, накопление и удержание нескомпенсированной плазмы в стеллараторной магнитной конфигурации Article published earlier |
| spellingShingle | Creation, accumulation and confinement of non-neutral plasmas in stellarator magnetic configuration Volkov, Е.D. Petrushenya, A.A. Tarasov, I.K. Batrakov, A.B. Lonin, Yu.F. Rudnev, N.I. Magnetic confinement |
| title | Creation, accumulation and confinement of non-neutral plasmas in stellarator magnetic configuration |
| title_alt | Створення, накопичення та утримання нескомпенсованої плазми у стеллараторній магнітній конфігурації Создание, накопление и удержание нескомпенсированной плазмы в стеллараторной магнитной конфигурации |
| title_full | Creation, accumulation and confinement of non-neutral plasmas in stellarator magnetic configuration |
| title_fullStr | Creation, accumulation and confinement of non-neutral plasmas in stellarator magnetic configuration |
| title_full_unstemmed | Creation, accumulation and confinement of non-neutral plasmas in stellarator magnetic configuration |
| title_short | Creation, accumulation and confinement of non-neutral plasmas in stellarator magnetic configuration |
| title_sort | creation, accumulation and confinement of non-neutral plasmas in stellarator magnetic configuration |
| topic | Magnetic confinement |
| topic_facet | Magnetic confinement |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/79339 |
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