Electrons cross transfer in multislit electromagnetic trap “Jupiter 2M”
The researches of cross electrons transfer in the central and face parts of a trap are carried out. It is shown, that increased electrons transfer in a face part is connected to presence here toroidal area of the superseded magnetic field. The change of a magnetic configuration has resulted in reduc...
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| Published in: | Вопросы атомной науки и техники |
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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: | Electrons cross transfer in multislit electromagnetic trap “Jupiter 2M” / O.A. Lavrent’ev, V.A. Maslov, S.V. Germanova, M.G. Nozdrachov, V.P. Oboznyj, B.A. Shevchuk, N.A. Skoryk // Вопросы атомной науки и техники. — 2005. — № 2. — С. 32-34. — Бібліогр.: 1 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1859865279306137600 |
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| author | Lavrent’ev, O.A. Maslov, V.A. Germanova, S.V. Nozdrachov, M.G. Oboznyj, V.P. Shevchuk, B.A. Skoryk, N.A. |
| author_facet | Lavrent’ev, O.A. Maslov, V.A. Germanova, S.V. Nozdrachov, M.G. Oboznyj, V.P. Shevchuk, B.A. Skoryk, N.A. |
| citation_txt | Electrons cross transfer in multislit electromagnetic trap “Jupiter 2M” / O.A. Lavrent’ev, V.A. Maslov, S.V. Germanova, M.G. Nozdrachov, V.P. Oboznyj, B.A. Shevchuk, N.A. Skoryk // Вопросы атомной науки и техники. — 2005. — № 2. — С. 32-34. — Бібліогр.: 1 назв. — англ. |
| collection | DSpace DC |
| container_title | Вопросы атомной науки и техники |
| description | The researches of cross electrons transfer in the central and face parts of a trap are carried out. It is shown, that increased electrons transfer in a face part is connected to presence here toroidal area of the superseded magnetic field. The change of a magnetic configuration has resulted in reduction of a cross electrons transfer in a face part, increase of density and negative potential of plasma.
Проведено дослідження поперечного переносу електронів у центральній і торцевій частинах пастки. Показано, що підвищений перенос електронів в торцевій частині пов'язаний з наявністю тут тороїдальної області витиснутого магнітного поля. Зміна магнітної конфігурації привела до зменшення поперечного потоку електронів у торцевій частині, збільшенню густини і негативного потенціалу плазми.
Проведены исследования поперечного переноса электронов в центральной и торцевой частях ловушки. Показано, что повышенный перенос электронов в торцевой части связан с наличием здесь тороидальной области вытесненного магнитного поля. Изменение магнитной конфигурации привело к уменьшению поперечного потока электронов в торцевой части, увеличению плотности и отрицательного потенциала плазмы.
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| first_indexed | 2025-12-07T15:48:08Z |
| format | Article |
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ELECTRONS CROSS TRANSFER IN MULTISLIT ELECTROMAGNETIC
TRAP “JUPITER 2M”
O.A. Lavrent’ev, V.A. Maslov, S.V. Germanova, M.G. Nozdrachov, V.P. Oboznyj,
B.A. Shevchuk, N.A. Skoryk
Institute of Plasma Physics, NSC KIPT, Kharkov, Ukraine, e-mail: lavr@ipp.kharkov.ua
The researches of cross electrons transfer in the central and face parts of a trap are carried out. It is shown, that
increased electrons transfer in a face part is connected to presence here toroidal area of the superseded magnetic field.
The change of a magnetic configuration has resulted in reduction of a cross electrons transfer in a face part, increase of
density and negative potential of plasma.
PACS: 52.55.-s
Plasma in the electromagnetic trap “Jupiter 2M”[1] is
created by neutral gas ionization with high-energy
electrons injected through axial holes. Electrons are
confined in a trap by an acute-angle magnetic field and
system of locking electrodes in the magnetic slits, and
ions – by negative volumetric charge of electrons. At high
enough locking potential in magnetic slits electrons can
leave a trap only as a result of diffusion through a
magnetic field, and ions - through magnetic slits, where
height of a potential barrier for them is less at the expense
of potential depression of a volumetric electrons charge.
Electrons diffusion through a magnetic field is the
basic process determining a plasma confinement in a trap,
the losses of ions are arranged under electrons losses by
self-coordinated change of potential barriers height in
magnetic slits.
In the previous experiments it was noticed, that the
electrons diffusion flow in a face part of a trap is much
more, than in the central part. In figure 1 a current of
electrons injection (1), the currents of electrons losses
across a magnetic field in the central part (2) and face
parts of a trap (3) are given.
Fig. 1
It is visible, that the electrons losses in a face part of a
trap twice exceed losses in the central part of a trap, and
the area of a magnetic surface limiting area of plasma
accumulation in the central part is 8 times more, than in a
face part (2,03 m2 and 0,47 m2 accordingly).
The results of numerical accounts of electrons losses and
their dependences on size from magnetic field intensity
and plasma density in the assumption of Coulomb
collisions were compared to results of experimental
researches for research of electrons losses character
across a magnetic field.
The electrons flows across a magnetic field were
registered on diaphragm, which limits area of plasma
accumulation in a trap. The measurements of injection
current, ions losses through magnetic slits, plasma density
and potential were carried out simultaneously.
Plasma density was measured by a microwave
interferometer, assembled in a Wharton circuit.
Oscillogram of linear plasma density in radial section is
submitted in fig. 2. The radial distribution of plasma
density was measured by a single Langmuir probe in a
mode of a ions current of saturation. Plasma potential was
measured by a single Langmuir probe in a floating mode.
Fig. 2
The model of electrons transfer across a magnetic
field for a multislit electromagnetic trap with
axisymmetric magnetic field geometry in the assumption
of Coulomb collisions was used for numerical accounts in
view of electrons mobility in the electrical field. The flow
of cross electrons transfer through a magnetic field in the
central part of a trap is equal
Iцe = [Dea(1+Фp/2Te0)+Dei]Fцne0R2 , (1)
and in a face part
Iтe = [Dea(1+Фp/2Te0)+Dei]Fкne0R2 (2)
where: Dea, Dei - factors of electrons diffusion on neutral
gas and plasma flows, which are normalized to a magnetic
field in a ring slit and plasma parameters in the central
area; Фp - plasma potential (in power units); Fц and Fk -
32 Problems of Atomic Science and Technology. Series: Plasma Physics (11). 2005. № 2. P. 32-34
mailto:lavr@ipp.kharkov.ua
crest factors, taking into account real geometry of a
magnetic field in a cylindrical central part and on the ends
of a trap; R - ring magnetic slit radius. Factors of
diffusion: Dea=9,1.10-7naTe0/BA
2, Dei=6,6.10-4ne0/Te0
1/2B
33
BA
2,
ne0, na - plasma density and neutral gas density, сm ; T-3
e -
electrons temperature, eV; ВA - magnetic field in a ring
magnetic slit, Gs. The accounts were carried out for a real
magnetic configuration of a multislit electromagnetic trap
"Jupiter 2М". For parameters "Jupiter 2М" Fц=92,7;
Fk=171,6 (at width of a ring magnetic slit 2а=0,4 сm and
radius of an axial aperture r0=1,3 сm, R=21,5 сm). The
experimental values of plasma density, neutral gas
density, plasma potential and electrons temperature were
used for accounts. As a result of accounts the flows of
cross electrons losses from a trap in the central and face
part and their dependence on plasma density and magnetic
field intensity for real conditions of experiment of a
multislit electromagnetic trap "Jupiter 2М" are received.
Theoretical and experimental dependence of an electrons
flow across a magnetic field through a boundary surface in
the central section of a trap from magnetic field intensity in
a slit with plasma density in a trap ne = 4,5×1011 cm-3 are
given in fig. 3, theoretical and experimental dependence for
a face part of a trap - in fig.4.
Fig. 3
Fig. 4
The points on the diagrams represent experimental
values of an electrons flow, and continuous line –
theoretical ones.
The electrons flow across a magnetic field in the
central section and face part of a trap grows with increase
of plasma density, and decreases with growth of magnetic
field intensity.
The experimental dependences of an electrons flow
across a magnetic field in the central and face parts of a
trap from plasma density are qualitatively similar, but
they differ from theoretical dependences calculated in the
assumption of Coulomb collisions. The relation of the
measured cross electrons flow to calculated one is given in
fig. 5. This relation decreases from value 10 - 15 to 2 - 2.5
with growth of plasma density from 1011 up to 1012 сm-3.
Fig. 5
Experimental dependences of an electrons flow across
a magnetic field in the central and face parts of a trap
from magnetic field intensity are qualitatively similar to
theoretical dependences. But the experimental flows
exceed theoretical. And in the central part of a trap at
intensity of a magnetic field in a slit Нsl = 8,5 kGs and the
plasma density ne = 1,2×1012 сm-3 experimental flows
exceed theoretical in 2,5 times, and in a face part - in 8
times. These results can be connected with a magnetic
field configuration in the region where a face part
interfaces with the central part of a trap.
In fig. 6 continuous lines show magnetic force lines of
"Jupiter 2М" installation, and points - area of identical
intensity of a magnetic field (20 Gs, 60 Gs, 120 Gs) for
magnetic field intensity in a slit Нsl = 8,5 kGs. А-А -
section of a microwave interferometer probing. It is
visible from this figure, that the ring area of a zero
magnetic field is formed in a face part of a trap. Large
volume of non-magnetized plasma in face area can cause
the large flow of particles through a face surface.
А
А
Fig. 6
The change of a magnetic field configuration resulted in
change of a ratio of electrons flows losses in the central
and face parts of a trap. The current of electrons injection
(1), currents of electrons losses across a magnetic field in
the central part (2) and face parts of a trap (3) for a new
configuration of a magnetic field are given in fig. 8.
Some variants of magnetic field configuration changes
in a face part of a trap were counted. The variant with
switching-off of interface coils (fig. 7) appeared to be
most acceptable. In this case area of a zero magnetic field
is displaced in the central paraxial area in section of a
microwave interferometer probing A-A.
А
34
А
Fig. 7
Fig. 9
At the same time linear density nl is increased in 1.5
times, fig. 9, and plasma potential is increased from Фp =
130 V up to Фp = 200 V.
REFERENCES
1. S.A. Vdovin, O.A. Lavrent’ev, V.A. Maslov,
M.G.Nozdrachov, V.P. Oboznyj, N.N. Sappa. Plasma
storage in the multislit electromagnetic trap “Jupiter
2M” // Voprosy Atomnoj Nauki i tekhniki. Ser.:”
Termoyadernyj Sintez” (3). Moscow, 1989, p. 40-45.
Fig. 8
ПОПЕРЕЧНЫЙ ПЕРЕНОС ЭЛЕКТРОНОВ В МНОГОЩЕЛЕВОЙ ЭЛЕКТРОМАГНИТНОЙ
ЛОВУШКЕ “ЮПИТЕР 2М”
О.А. Лаврентьев, В.А. Маслов, С.В. Германова, М.Г. Ноздрачёв, В.П. Обозный, Б.А. Шевчук, Н.А. Скорик
Проведены исследования поперечного переноса электронов в центральной и торцевой частях ловушки.
Показано, что повышенный перенос электронов в торцевой части связан с наличием здесь тороидальной
области вытесненного магнитного поля. Изменение магнитной конфигурации привело к уменьшению
поперечного потока электронов в торцевой части, увеличению плотности и отрицательного потенциала плазмы.
ПОПЕРЕЧНИЙ ПЕРЕНОС ЕЛЕКТРОНІВ В БАГАТОЩІЛИННІЙ ЕЛЕКТРОМАГНІТНІЙ ПАСТЦІ
“ЮПІТЕР 2М”
О.О. Лаврентьєв, В.О. Маслов, С.В. Германова, М.Г. Ноздрачов, В.П. Обозний, Б.О. Шевчук, Н.О. Скорик
Проведено дослідження поперечного переносу електронів у центральній і торцевій частинах пастки.
Показано, що підвищений перенос електронів в торцевій частині пов'язаний з наявністю тут тороїдальної
області витиснутого магнітного поля. Зміна магнітної конфігурації привела до зменшення поперечного потоку
електронів у торцевій частині, збільшенню густини і негативного потенціалу плазми.
B.A. Shevchuk, N.A. Skoryk
Fig. 4
Fig. 6
А
Fig. 7
|
| id | nasplib_isofts_kiev_ua-123456789-79337 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 1562-6016 |
| language | English |
| last_indexed | 2025-12-07T15:48:08Z |
| publishDate | 2005 |
| publisher | Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| record_format | dspace |
| spelling | Lavrent’ev, O.A. Maslov, V.A. Germanova, S.V. Nozdrachov, M.G. Oboznyj, V.P. Shevchuk, B.A. Skoryk, N.A. 2015-03-31T13:32:15Z 2015-03-31T13:32:15Z 2005 Electrons cross transfer in multislit electromagnetic trap “Jupiter 2M” / O.A. Lavrent’ev, V.A. Maslov, S.V. Germanova, M.G. Nozdrachov, V.P. Oboznyj, B.A. Shevchuk, N.A. Skoryk // Вопросы атомной науки и техники. — 2005. — № 2. — С. 32-34. — Бібліогр.: 1 назв. — англ. 1562-6016 PACS: 52.55.-s https://nasplib.isofts.kiev.ua/handle/123456789/79337 The researches of cross electrons transfer in the central and face parts of a trap are carried out. It is shown, that increased electrons transfer in a face part is connected to presence here toroidal area of the superseded magnetic field. The change of a magnetic configuration has resulted in reduction of a cross electrons transfer in a face part, increase of density and negative potential of plasma. Проведено дослідження поперечного переносу електронів у центральній і торцевій частинах пастки. Показано, що підвищений перенос електронів в торцевій частині пов'язаний з наявністю тут тороїдальної області витиснутого магнітного поля. Зміна магнітної конфігурації привела до зменшення поперечного потоку електронів у торцевій частині, збільшенню густини і негативного потенціалу плазми. Проведены исследования поперечного переноса электронов в центральной и торцевой частях ловушки. Показано, что повышенный перенос электронов в торцевой части связан с наличием здесь тороидальной области вытесненного магнитного поля. Изменение магнитной конфигурации привело к уменьшению поперечного потока электронов в торцевой части, увеличению плотности и отрицательного потенциала плазмы. en Національний науковий центр «Харківський фізико-технічний інститут» НАН України Вопросы атомной науки и техники Magnetic confinement Electrons cross transfer in multislit electromagnetic trap “Jupiter 2M” Поперечний перенос електронів в багатощілинній електромагнітній пастці “Юпітер 2М” Поперечный перенос электронов в многощелевой электромагнитной ловушке “Юпитер 2М” Article published earlier |
| spellingShingle | Electrons cross transfer in multislit electromagnetic trap “Jupiter 2M” Lavrent’ev, O.A. Maslov, V.A. Germanova, S.V. Nozdrachov, M.G. Oboznyj, V.P. Shevchuk, B.A. Skoryk, N.A. Magnetic confinement |
| title | Electrons cross transfer in multislit electromagnetic trap “Jupiter 2M” |
| title_alt | Поперечний перенос електронів в багатощілинній електромагнітній пастці “Юпітер 2М” Поперечный перенос электронов в многощелевой электромагнитной ловушке “Юпитер 2М” |
| title_full | Electrons cross transfer in multislit electromagnetic trap “Jupiter 2M” |
| title_fullStr | Electrons cross transfer in multislit electromagnetic trap “Jupiter 2M” |
| title_full_unstemmed | Electrons cross transfer in multislit electromagnetic trap “Jupiter 2M” |
| title_short | Electrons cross transfer in multislit electromagnetic trap “Jupiter 2M” |
| title_sort | electrons cross transfer in multislit electromagnetic trap “jupiter 2m” |
| topic | Magnetic confinement |
| topic_facet | Magnetic confinement |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/79337 |
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