Peripheral plasma characteristics in the Uragan-3M torsatron
In the l=3/m=9 Uragan-3M (U-3M) torsatron a hydrogen plasma is produced and heated by RF fields in the Alfvén range of frequencies (ω≤ωci). Peripheral plasma is investigated using two moveable Langmuir probes. Spatial distributions of plasma parameters, Vf, Te and ne in two operating regimes and in...
Saved in:
| Published in: | Вопросы атомной науки и техники |
|---|---|
| Date: | 2015 |
| Main Authors: | , , , , , , , , , , , |
| Format: | Article |
| Language: | English |
| Published: |
Національний науковий центр «Харківський фізико-технічний інститут» НАН України
2015
|
| Subjects: | |
| Online Access: | https://nasplib.isofts.kiev.ua/handle/123456789/82408 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Journal Title: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Cite this: | Peripheral plasma characteristics in the uragan-3m torsatron/ A.A. Kasilov, L.I. Grigor’eva, V.V. Chechkin, A.A. Beletskii, R.O. Pavlichenko, A.V. Lozin, M.M. Kozulya, A.Ye. Kulaga, N.V. Zamanov, Yu.K. Mironov, V.S. Romanov, V.S. Voitsenya // Вопросы атомной науки и техники. — 2015. — № 1. — С. 24-27. — Бібліогр.: 7 назв. — англ. |
Institution
Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1859536533480013824 |
|---|---|
| author | Kasilov, A.A. Grigor’eva, L.I. Chechkin, V.V. Beletskii, A.A. Pavlichenko, R.O. Lozin, A.V. Kozulya, M.M. Kulaga, A.Ye. Zamanov, N.V. Mironov, Yu.K. Romanov, V.S. Voitsenya, V.S. |
| author_facet | Kasilov, A.A. Grigor’eva, L.I. Chechkin, V.V. Beletskii, A.A. Pavlichenko, R.O. Lozin, A.V. Kozulya, M.M. Kulaga, A.Ye. Zamanov, N.V. Mironov, Yu.K. Romanov, V.S. Voitsenya, V.S. |
| citation_txt | Peripheral plasma characteristics in the uragan-3m torsatron/ A.A. Kasilov, L.I. Grigor’eva, V.V. Chechkin, A.A. Beletskii, R.O. Pavlichenko, A.V. Lozin, M.M. Kozulya, A.Ye. Kulaga, N.V. Zamanov, Yu.K. Mironov, V.S. Romanov, V.S. Voitsenya // Вопросы атомной науки и техники. — 2015. — № 1. — С. 24-27. — Бібліогр.: 7 назв. — англ. |
| collection | DSpace DC |
| container_title | Вопросы атомной науки и техники |
| description | In the l=3/m=9 Uragan-3M (U-3M) torsatron a hydrogen plasma is produced and heated by RF fields in the Alfvén range of frequencies (ω≤ωci). Peripheral plasma is investigated using two moveable Langmuir probes. Spatial distributions of plasma parameters, Vf, Te and ne in two operating regimes and in three cross-sections are measured. Link between confinement volume and transition layer is shown. RF electric antenna field influence on the probes is discussed.
В торсатроне Ураган-3М (У-3М) водородная плазма создается и нагревается ВЧ-полями в области альфвеновских частот (ω≤ωci). Периферийная плазма исследована с помощью двух подвижных ленгмюровских зондов. Пространственные распределения параметров плазмы (Vf, Te и ne) были измерены в двух режимах работы установки в трех полоидальных сечениях. Показано существование связи между областью удержания и переходным слоем. Обсуждается влияние ВЧ-электрического поля антенны на зонд.
У торсатроні Ураган-3М (У-3М) воднева плазма створюється та нагрівається ВЧ-полями в області альфвенівських частот (ω≤ωci). Периферійна плазма досліджена за допомогою двох рухомих ленгмюровських зондів. Просторові розподіли параметрів плазми (Vf, Te та ne) були виміряні в двох режимах роботи установки в трьох полоїдальних перерізах. Показано існування зв'язку між областю утримання та перехідним шаром. Обговорюється вплив ВЧ-електричного поля антени на зонд.
|
| first_indexed | 2025-11-25T23:32:43Z |
| format | Article |
| fulltext |
ISSN 1562-6016. ВАНТ. 2015. №1(95)
24 PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY. 2015, № 1. Series: Plasma Physics (21), p. 24-27.
PERIPHERAL PLASMA CHARACTERISTICS
IN THE URAGAN-3M TORSATRON
A.A. Kasilov, L.I. Grigor’eva, V.V. Chechkin, A.A. Beletskii, R.O. Pavlichenko, A.V. Lozin,
M.M. Kozulya, A.Ye. Kulaga, N.V. Zamanov, Yu.K. Mironov, V.S. Romanov, V.S. Voitsenya
Institute of Plasma Physics of the NSC “Kharkov Institute of Physics and Technology”,
Kharkov, Ukraine
In the l=3/m=9 Uragan-3M (U-3M) torsatron a hydrogen plasma is produced and heated by RF fields in the
Alfvén range of frequencies (ω≤ωci). Peripheral plasma is investigated using two moveable Langmuir probes.
Spatial distributions of plasma parameters, Vf, Te and ne in two operating regimes and in three cross-sections are
measured. Link between confinement volume and transition layer is shown. RF electric antenna field influence on
the probes is discussed.
PACS: 52.70.Ds
INTRODUCTION
In the l=3/m=9 Uragan-3M (U-3M) torsatron a
hydrogen plasma is produced and heated by RF fields in
the Alfvén range of frequencies (ω≤ωci). To introduce
RF power into the plasma, an unshielded frame-like
antenna is used with a broad spectrum of generated
parallel wavelengths [1, 2]. In the present paper,
characteristics of the plasma between the last closed
flux surface (LCFS) and the helical winding casings
(peripheral plasma) are studied. Parameters of the
peripheral plasma and running processes are closely
connected with parameters and processes in the
confinement volume. So, in many cases, studying
characteristics and behavior of the peripheral plasma it
is possible to get information about processes in the
confinement volume.
Due to characteristic properties of the U-3M device,
such as enclosing the whole magnetic system into a
large vacuum chamber, a specific structure of the edge
field lines ensuring the helical divertor magnetic
configuration, and the RF method of plasma production
and heating with the antenna disposed in a short section
of the torus, strong toroidal and radial inhomogeneities
are inherent to the peripheral plasma.
Spatial distributions of the peripheral plasma
parameters (electron temperature Te and density ne,
floating potential Vf) in different regimes are studied
with the help of Langmuir probes in the peripheral
plasma in a poloidal torus cross-section far from the
antenna and in two cross-sections in the region of
antenna disposition, one of them crossing the area
bounded by the antenna frame. The measurements are
carried out in two discharge regimes [3] differing in the
average density,
en , electron temperature, and plasma
loss. As opposed to distributions of Te, ne and Vf far from
the antenna, absolute values of this quantities and their
spatial distributions close to the antenna are subjected to
strong perturbations by the near antenna field.
1. DEVICE DESCRIPTION AND GENERAL
DISCHARGE PARAMETERS
Toroidal magnetic field Вφ = 0.72 Т is generated by
the helical coils only (Fig. 1). The whole magnetic
system is enclosed into a ~70 m
3
vacuum chamber, so
an open helical divertor is realized. The frame-like
antenna (FA; 66 cm length along the torus (Fig. 2)) and
a so-called three-half-turn antenna (THTA; 30 cm) are
the only material objects placed between the LCFS and
the helical coils. THTA is used here only for
preliminary ionization before RF voltage applied to the
FA. FA is symmetrically connected to the Kaskad-1
(K1) one-stage push-pull RF oscillator and d. c. isolated
from the ground (vacuum chamber, helical coils).
Fig. 1. U-3M helical coils I, II, III and symmetrical
poloidal cross-sections A1, D1, A2, D2,…, A9, D9 in the
helical periods 1, 2,..., 9. Dispositions of main
diagnostics, FA and THTA are indicated
~
Fig. 2. Schematic representation of the frame antenna
RF power was changed within 45…130 kW with the
K1 anode voltage changing from 5 to 9 kV. A part of this
power is spent for plasma maintenance and heating in the
confinement volume. Generally, plasma heating is
connected with slow wave absorption by electrons [4, 5].
ISSN 1562-6016. ВАНТ. 2015. №1(95) 25
80 85 90 95 100 105 110 115 120
-20
-15
-10
-5
0
5
10
15
20
III
II
r,
c
m
R, cm
I
MP-1
(a)
80 85 90 95 100 105 110 115 120
-20
-15
-10
-5
0
5
10
15
20
III
II
r,
c
m
R, cm
MP-2
I
(b)
80 85 90 95 100 105 110 115 120
-20
-15
-10
-5
0
5
10
15
20
III
II
r,
c
m
R, cm
MP-2
I
(c)
Fig. 3. Disposition of the movable probes in the poloidal cross-sections and lines of their movement (solid lines) relative to
the helical coils I, II, III: (a) probe MP-1 (far from the antenna, period 8); (b) probe MP-2 (position 1 – close to the antenna,
period 9); (c) probe MP-2 (period 1; position 2 – the probe crosses the area bounded by the antenna frame)
2. RF DISCHARGE REGIMES
In the active stage of the RF discharge two operating
regimes differing by the density,
en , electron
temperature, Te
rad
, and plasma loss can exist depending
on the power P (voltage UK, current IRF) and pressure p.
Regime 1 is characterized by a low density
en ~ (1…3)∙10
12
cm
-3
, high electron temperature (Te
rad
up
to 800 eV) and large plasma loss. (The latter is estimated
by the value of the divertor plasma flow, DPF, which in
turn is presented by the ion saturation current, Is, to an
electric probe crossed by DPF). A higher density
en ~7∙10
12
cm
-3
, a lower temperature (tens eV) and low
plasma loss are inherent to the regime 2. When
UK ~ 5…7 kV regime 1 is realized in the initial stage of
the discharge and then passes to the regime 2. At higher
UK > 7 kV regime 1 persists over the entire RF pulse.
Measurements with the probe MP-2 were carried out
in two poloidal cross-sections between A1 and D1 near
the FA. In one experimental session the probe was moved
along the vertical line at the distance 5 cm from the
vertical axis of the cross-section and ~3 cm from the FA
edge. In this case Vf, Te and ne dependencies from
distance l between MP-2 and the torus midplane were
measured. The probe crossed calculated LCFS at
l ≈ 16 cm. During another experimental campaign the
vertical line of the probe MP-2 movement was at the
distance 3 cm from the vertical axis of the poloidal cross-
section and crossed the area limited by the antenna frame.
Vf, Te and ne values were evaluated from the ion
branch of the probe IV characteristic (IVC). IVCs were
obtained using a 125 Hz saw-tooth generator with a
180 V negative bias voltage.
To determine the plasma parameters referred above
the "ideal" dependence (see, e.g., [6])
I(V) = Is{1 – exp[(V-Vf)/Te]}, (1)
was fitted to the experimental IVC using least-squares
method; where I(V) – probe current; V – bias voltage;
Is≈0,5Anee(2Te/mi)
1/2
– ion saturation current; A – probe
collection area (Fig. 4).
As numerical calculations show, in all the MP-1 and
MP-2 probe positions the "strong magnetic field" case,
ρе < d < ρi, is realized, where d – probe diameter, ρi and ρе
– ion and electron Larmor radii [6].
3. EVALUATION OF THE PERIPHERAL
PLASMA PARAMETERS
Local peripheral plasma parameters in the region
between the LCFS and helical coils were measured with
movable single cylindrical langmuir probes MP-1 and
MP-2 (diameter of the collection area 1 mm, length
2 mm, molybdenum) (Fig. 3). The probe MP-1 was
moved horizontally from the outboard torus side
between the symmetric cross-sections A8 and D8
parallel to the major radius at the distance 1 cm above
the torus midplane. Dependences of ne(h), Te(h) и Vf(h)
were measured, where h – the distance from the probe
to the vertical axis of the poloidal cross-section where
the probe is placed. The probe crossed calculated LCFS
at h ≈ 10 cm.
-200 -160 -120 -80 -40 0 40
-0,2
0,0
0,2
0,4
0,6
0,8
1,0
I
s
~ 37 mA
T
e
~ 250 eV
I(
v
)/
I s
,
m
A
bias voltage, V (volts)
I
s
= 9 mA
T
e
= 33 eV
V
1
V
2
Fig. 4. Examples of experimental IVC (circles)
superposed on the ideal curves calculated using Eq. (1)
(lines) far (red) and close (blue) to the FA
The existence of a strong parallel RF electric field
near the FA where the energy of directed motion of
electrons can significantly exceed mean energy of the
thermal motion leads to strong deviations from the
maxwellian distribution. On the other hand, a large
negative potential Vf which appears due to the
rectification effect [7], complicates receiving a
sufficient part of the IVC ion branch for correct
estimation of Te and ne (see Fig. 4).
In Fig. 4 two IVCs for the regime 1 are shown as an
example. One of them, typical for MP-1, allows to
estimate accurately Te and ne using Eq. (1). Another
IVC was measured with the probe MP-2 close to FA. In
this case, IVC is shifted to a large negative bias V. As a
result, only a small, close to straight line part of IVC is
available for processing, where the fluctuation-induced
scatter of the real IVC from the fitting curve could lead
to strong errors in Vf, Te and ne estimation. So, in
assumption of the maxwellian distribution, it is possible
26 ISSN 1562-6016. ВАНТ. 2015. №1(95)
to talk only about some lower limit of the conventional
electron temperature (mean energy) ~250 eV.
4. MEASUREMENTS RESULTS
4.1. PERIPHERAL PLASMA FAR FROM
THE ANTENNA
In Fig. 5 spatial dependencies Vf(h) (see Fig. 5,a),
Te(h) (see Fig. 5,b) and ne(h) (see Fig. 5с,d) in the
regimes I and II are shown. It is seen that at the
distances from the LCFS 12 cm ≲ h 19 cm, Vf and Te
change slowly, within (-10…+20 V) and (20…40 eV),
respectively, and ne increases monotonically from units
10
8
сm
-3
(h = 19 cm) to ~10
10
сm
-3
(h = 12 cm). Closer
to LCFS a sharp rise of parameters is observed in the
regime I in a transition layer, 10 cm ≲ h 12 cm,
including the ergodic layer. The maximal values of Vf
(up to 83 V), Te (up to 80 eV) and ne (up to 6∙10
11
сm
-3
)
are reached at h 9.7 cm. Comparing the values of
plasma parameters in the transition layer in two
regimes, it is seen that there is no big difference
between Vf values, but maximal density in the regime II
reaches 10
12
сm
-3
(h = 9.7 cm) and Te remains on the
same level as at h > 12 cm. A further movement inside
the confinement volume caused plasma perturbations
(electron temperature and ECE decrease, impurity
radiation increase).
During the regime I–regime II transition density
increasing and temperature decreasing in the 2 cm layer
boarding to LCFS represent average density and electron
temperature changes in the confinement volume, thus
confirming a link between plasma parameters in the
confinement volume and transition layer.
8 10 12 14 16 18 20
-20
0
20
40
60
80
100
regime 1
regime 2
V
fl
o
a
t,
V
h, cm
(a)
8 10 12 14 16 18 20
0
10
20
30
40
50
60
70
80
90
100
h, cm
T
e
,
e
V
regime 1
regime 2(b)
8 10 12 14 16 18 20
0
2
4
6
8
10
12
h, cm
n
e
,
1
0
1
1
c
m
-3
regime 1
regime 2(c)
8 10 12 14 16 18 20
1E8
1E9
1E10
1E11
1E12
h, cm
n
e
,
c
m
-3
regime 1
regime 2(d)
Fig. 5. Spatial distributions of plasma parameters
measured using the probe MP-1 (far from the antenna).
(a) – floating potential; (b) – electron temperature;
(c, d) – electron density
4.2. PERIPHERAL PLASMA CLOSE
TO THE ANTENNA
Measuring plasma parameters close to the FA, we
can expect strong deviations of the values and spatial
distributions of these parameters comparing with
parameters far from the FA. These deviations could be
caused not only because of antenna being a material
object, but of stronger influence of the RF field,
generated by the antenna, as well.
As it has been already mentioned above (Sec. 3), the
probe MP-2 should receive a d. c. negative floating
potential due to the rectification effect in the strong
electric field generated by the antenna. The value of this
potential depends on the electron temperature and RF
potential oscillation amplitude [7].
Vf(h) dependencies, measured with the MP-2 probe
in the regime I and II in the position 2, are shown in
Fig. 6, a. It is seen that the values and profiles of these
dependencies significantly differ from those far from
FA (probe MP-1, see Fig. 5,a). At some distances the Vf
values are lower than -100 V. Particularly, the average
Vf values change nonmonotonically within the range of
(-10….-140) V comparing with (-10…+80) V far from
FA in the regime I, and (0…-160) V comparing with
(-10…+100) V far from the antenna in the regime II.
-200
-180
-160
-140
-120
-100
-80
-60
-40
-20
0
20
regime 1
regime 2
l, cm
V
fl
o
a
t,
V
(a)
9 10 11 12 13 14 15 16 17 18 19 20
8 9 10 11 12 13 14 15 16 17 18 19 20
0
50
100
150
200
250
300
350 regime 1
regime 2
l, cm
T
e
,
e
V
(b)
8 9 10 11 12 13 14 15 16 17 18 19 20
0
2
4
6
8
10
12
14
l, cm
n
e
,1
0
1
1
c
m
-3
regime 1
regime 2
(c)
8 10 12 14 16 18 20
1E8
1E9
1E10
1E11
1E12
l, cm
n
e
,
c
m
-3
regime 1
regime 2
(d)
Fig. 6. Spatial distributions of plasma parameters
measured using the probe MP-2 (close to the antenna,
position 2). (a) – floating potential; (b) – electron
temperature; (c, d) – electron density
The high negative floating potential Vf causes an
IVC shift to the higher negative bias voltage V, so it is
possible to get only a short, close to a straight line, part
of IVC without any saturation. It is possible to evaluate
Te and ne only at the distances 11.5 ≲ l ≲ 13.5 cm,
where saturation appears. In this case we can evaluate
some "efficient" electron temperature, which is
noticeably higher, up to ~350 eV, comparing with
Те ≲ 40 eV far from FA (see Fig. 5,b).
14 15 16 17 18 19 20 21 22 23 24
0
10
20
30
40
50
60
70
80
90
100
110
T
e
,
e
V
h, cm
(a)
15 16 17 18 19 20 21 22 23
1E9
1E10
1E11
1E12
n
e
,
c
m
-3
h, cm
(b)
Fig. 7. Spatial distributions of plasma parameters
measured using the probe MP-2 (close to the antenna,
position 1) in the regime 1. (a) – electron temperature;
(b) – electron density
In Fig. 7 Te and ne spatial profiles in the regime I in
the position 1 are presented. In this case, higher
temperature (up to 100 eV) and density (up to
~3∙10
12
cm
-3
), caused by influence of the near antenna
field, are also observed.
ISSN 1562-6016. ВАНТ. 2015. №1(95) 27
It should be noticed, that close to FA, at the
distances 10 < l < 12 cm (transition layer), the electron
temperature and density tend to return to the same
values as far from FA. It means that the direct influence
of the near antenna field on the plasma parameters
decreases as far as l approaches 10 cm.
DISCUSSION AND SUMMARY
1. A similar character of Te and ne variations in the
transition layer and in the confinement region is
observed depending on the operating regime. Such a
behavior evidences interconnection between the
transition layer and the confinement volume.
2. Near the antenna the values of Vf (absolute value),
Te and ne considerably exceed those measured far from
the antenna at similar distances h and l. The
monotonous variations of ne and Te with distance
observed far from the antenna are significantly broken
near the antenna. Presumably, a considerable part of the
RF power fed to the antenna is spent for peripheral
plasma production and heating near the antenna with a
further loss of this plasma.
3. Close by values plasma parameters in the
transition layer far and close to the antenna allow to
suppose that plasma perturbations caused by the frame
antenna are damped in the transition layer and do not
penetrate the confinement volume.
4. The frame antenna generates RF parallel electric
field. For efficient RF power injection into the plasma
and its heating the frequency and wavelength of these
oscillations should be close to the frequency and
wavelength of the natural oscillations of the plasma
column. Such oscillations propagate over the whole
plasma torus. At the same time, in the peripheral plasma
with its low density, these oscillations cannot propagate.
In fact, the parallel RF electric field generated by the
antenna affects the plasma similar to the near antenna
field that creates strong perturbations of plasma
parameters only near the antenna. In particular, a local
character of these perturbations is manifested in that the
density and temperature near LCFS are close to those
far from the antenna. A high negative potential Vf near
the antenna presumably is associated with the
rectification effect in the strong RF field [7].
REFERENCES
1. O.M. Shvets et al. // Nucl. Fusion.1986, v. 26, p. 23.
2. N.T. Besedin et al. // VIII IAEA Stellarator Workshop,
Kharkov, 1991. IAEA, Vienna, 1991, p. 53.
3. V.V. Chechkin et al. // Plasma Physics. 2014, v. 40,
№ 8, p. 697.
4. A.V. Longinov, K.N. Stepanov. Vysokochastotnyj
nagrev plasmy. Gorkij: IPF, 1983, p. 105 (in Russian).
5. V.Ye. Golant, V.I. Fedorov. Vysokochastotnyye
metody nagreva plasmy v toroidalnych termoyadernych
ustanovkach. M.: “Energoatomizdat”, 1986, p. 141 (in
Russian)
6. P.C. Stangeby, G.M. McCracken // Nuclear Fusion.
1990, v. 30, p. 1225.
7. V.A. Godyak, A.A. Kuzovnikov. O ventilnych
svojstvach VCh-razryadov // Fizika plasmy. 1975, v. 3
(in Russian).
Article received 10.12.2014
ХАРАКТЕРИСТИКИ ПЕРИФЕРИЙНОЙ ПЛАЗМЫ В ТОРСАТРОНЕ УРАГАН-3М
А.А. Касилов, Л.И. Григорьева, В.В. Чечкин, А.А. Белецкий, Р.О. Павличенко, А.В. Лозин,
М.М. Козуля, А.Е. Кулага, Н.В. Заманов, Ю.К. Миронов, В.С. Романов, В.С. Войценя
В торсатроне Ураган-3М (У-3М) водородная плазма создается и нагревается ВЧ-полями в области
альфвеновских частот ( ≲ ci). Периферийная плазма исследована с помощью двух подвижных
ленгмюровских зондов. Пространственные распределения параметров плазмы (Vf, Te и ne) были измерены в
двух режимах работы установки в трех полоидальных сечениях. Показано существование связи между
областью удержания и переходным слоем. Обсуждается влияние ВЧ-электрического поля антенны на зонд.
ХАРАКТЕРИСТИКИ ПЕРИФЕРІЙНОЇ ПЛАЗМИ В ТОРСАТРОНІ УРАГАН-3М
А.А. Касілов, Л.І. Григор’єва, В.В. Чечкін, О.О. Білецький, Р.О. Павличенко, О.В. Лозін, М.М. Козуля,
А.Є. Кулага, М.В. Заманов, Ю.К. Миронов, В.С. Романов, В.С. Войценя
У торсатроні Ураган-3М (У-3М) воднева плазма створюється та нагрівається ВЧ-полями в області
альфвенівських частот ( ≲ ci). Периферійна плазма досліджена за допомогою двох рухомих
ленгмюровських зондів. Просторові розподіли параметрів плазми (Vf, Te та ne) були виміряні в двох режимах
роботи установки в трьох полоїдальних перерізах. Показано існування зв'язку між областю утримання та
перехідним шаром. Обговорюється вплив ВЧ-електричного поля антени на зонд.
|
| id | nasplib_isofts_kiev_ua-123456789-82408 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 1562-6016 |
| language | English |
| last_indexed | 2025-11-25T23:32:43Z |
| publishDate | 2015 |
| publisher | Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| record_format | dspace |
| spelling | Kasilov, A.A. Grigor’eva, L.I. Chechkin, V.V. Beletskii, A.A. Pavlichenko, R.O. Lozin, A.V. Kozulya, M.M. Kulaga, A.Ye. Zamanov, N.V. Mironov, Yu.K. Romanov, V.S. Voitsenya, V.S. 2015-05-29T09:19:17Z 2015-05-29T09:19:17Z 2015 Peripheral plasma characteristics in the uragan-3m torsatron/ A.A. Kasilov, L.I. Grigor’eva, V.V. Chechkin, A.A. Beletskii, R.O. Pavlichenko, A.V. Lozin, M.M. Kozulya, A.Ye. Kulaga, N.V. Zamanov, Yu.K. Mironov, V.S. Romanov, V.S. Voitsenya // Вопросы атомной науки и техники. — 2015. — № 1. — С. 24-27. — Бібліогр.: 7 назв. — англ. 1562-6016 PACS: 52.70.Ds https://nasplib.isofts.kiev.ua/handle/123456789/82408 In the l=3/m=9 Uragan-3M (U-3M) torsatron a hydrogen plasma is produced and heated by RF fields in the Alfvén range of frequencies (ω≤ωci). Peripheral plasma is investigated using two moveable Langmuir probes. Spatial distributions of plasma parameters, Vf, Te and ne in two operating regimes and in three cross-sections are measured. Link between confinement volume and transition layer is shown. RF electric antenna field influence on the probes is discussed. В торсатроне Ураган-3М (У-3М) водородная плазма создается и нагревается ВЧ-полями в области альфвеновских частот (ω≤ωci). Периферийная плазма исследована с помощью двух подвижных ленгмюровских зондов. Пространственные распределения параметров плазмы (Vf, Te и ne) были измерены в двух режимах работы установки в трех полоидальных сечениях. Показано существование связи между областью удержания и переходным слоем. Обсуждается влияние ВЧ-электрического поля антенны на зонд. У торсатроні Ураган-3М (У-3М) воднева плазма створюється та нагрівається ВЧ-полями в області альфвенівських частот (ω≤ωci). Периферійна плазма досліджена за допомогою двох рухомих ленгмюровських зондів. Просторові розподіли параметрів плазми (Vf, Te та ne) були виміряні в двох режимах роботи установки в трьох полоїдальних перерізах. Показано існування зв'язку між областю утримання та перехідним шаром. Обговорюється вплив ВЧ-електричного поля антени на зонд. en Національний науковий центр «Харківський фізико-технічний інститут» НАН України Вопросы атомной науки и техники Магнитное удержание Peripheral plasma characteristics in the Uragan-3M torsatron Характеристики периферийной плазмы в торсатроне Ураган-3М Характеристики периферійної плазми в торсатроні Ураган-3М Article published earlier |
| spellingShingle | Peripheral plasma characteristics in the Uragan-3M torsatron Kasilov, A.A. Grigor’eva, L.I. Chechkin, V.V. Beletskii, A.A. Pavlichenko, R.O. Lozin, A.V. Kozulya, M.M. Kulaga, A.Ye. Zamanov, N.V. Mironov, Yu.K. Romanov, V.S. Voitsenya, V.S. Магнитное удержание |
| title | Peripheral plasma characteristics in the Uragan-3M torsatron |
| title_alt | Характеристики периферийной плазмы в торсатроне Ураган-3М Характеристики периферійної плазми в торсатроні Ураган-3М |
| title_full | Peripheral plasma characteristics in the Uragan-3M torsatron |
| title_fullStr | Peripheral plasma characteristics in the Uragan-3M torsatron |
| title_full_unstemmed | Peripheral plasma characteristics in the Uragan-3M torsatron |
| title_short | Peripheral plasma characteristics in the Uragan-3M torsatron |
| title_sort | peripheral plasma characteristics in the uragan-3m torsatron |
| topic | Магнитное удержание |
| topic_facet | Магнитное удержание |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/82408 |
| work_keys_str_mv | AT kasilovaa peripheralplasmacharacteristicsintheuragan3mtorsatron AT grigorevali peripheralplasmacharacteristicsintheuragan3mtorsatron AT chechkinvv peripheralplasmacharacteristicsintheuragan3mtorsatron AT beletskiiaa peripheralplasmacharacteristicsintheuragan3mtorsatron AT pavlichenkoro peripheralplasmacharacteristicsintheuragan3mtorsatron AT lozinav peripheralplasmacharacteristicsintheuragan3mtorsatron AT kozulyamm peripheralplasmacharacteristicsintheuragan3mtorsatron AT kulagaaye peripheralplasmacharacteristicsintheuragan3mtorsatron AT zamanovnv peripheralplasmacharacteristicsintheuragan3mtorsatron AT mironovyuk peripheralplasmacharacteristicsintheuragan3mtorsatron AT romanovvs peripheralplasmacharacteristicsintheuragan3mtorsatron AT voitsenyavs peripheralplasmacharacteristicsintheuragan3mtorsatron AT kasilovaa harakteristikiperiferiinoiplazmyvtorsatroneuragan3m AT grigorevali harakteristikiperiferiinoiplazmyvtorsatroneuragan3m AT chechkinvv harakteristikiperiferiinoiplazmyvtorsatroneuragan3m AT beletskiiaa harakteristikiperiferiinoiplazmyvtorsatroneuragan3m AT pavlichenkoro harakteristikiperiferiinoiplazmyvtorsatroneuragan3m AT lozinav harakteristikiperiferiinoiplazmyvtorsatroneuragan3m AT kozulyamm harakteristikiperiferiinoiplazmyvtorsatroneuragan3m AT kulagaaye harakteristikiperiferiinoiplazmyvtorsatroneuragan3m AT zamanovnv harakteristikiperiferiinoiplazmyvtorsatroneuragan3m AT mironovyuk harakteristikiperiferiinoiplazmyvtorsatroneuragan3m AT romanovvs harakteristikiperiferiinoiplazmyvtorsatroneuragan3m AT voitsenyavs harakteristikiperiferiinoiplazmyvtorsatroneuragan3m AT kasilovaa harakteristikiperiferíinoíplazmivtorsatroníuragan3m AT grigorevali harakteristikiperiferíinoíplazmivtorsatroníuragan3m AT chechkinvv harakteristikiperiferíinoíplazmivtorsatroníuragan3m AT beletskiiaa harakteristikiperiferíinoíplazmivtorsatroníuragan3m AT pavlichenkoro harakteristikiperiferíinoíplazmivtorsatroníuragan3m AT lozinav harakteristikiperiferíinoíplazmivtorsatroníuragan3m AT kozulyamm harakteristikiperiferíinoíplazmivtorsatroníuragan3m AT kulagaaye harakteristikiperiferíinoíplazmivtorsatroníuragan3m AT zamanovnv harakteristikiperiferíinoíplazmivtorsatroníuragan3m AT mironovyuk harakteristikiperiferíinoíplazmivtorsatroníuragan3m AT romanovvs harakteristikiperiferíinoíplazmivtorsatroníuragan3m AT voitsenyavs harakteristikiperiferíinoíplazmivtorsatroníuragan3m |