High-power plasma dynamic systems of quasi-stationary type in IPP NSK KIPT: results and prospects
This paper is devoted to brief review of main experimental results of investigations of high-power quasi-stationary plasma dynamic systems in the IPP NSC KIPT. In experiments were shown that to received accelerated plasma streams with high value of energy in quasi-stationary modes all conditions on...
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України
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| Zitieren: | High-power plasma dynamic systems of quasi-stationary type in IPP NSK KIPT: results and prospects / D.G. Solyakov // Вопросы атомной науки и техники. — 2015. — № 1. — С. 104-109. — Бібліогр.: 18 назв. — англ. |
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| author | Solyakov, D.G. |
| author_facet | Solyakov, D.G. |
| citation_txt | High-power plasma dynamic systems of quasi-stationary type in IPP NSK KIPT: results and prospects / D.G. Solyakov // Вопросы атомной науки и техники. — 2015. — № 1. — С. 104-109. — Бібліогр.: 18 назв. — англ. |
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| container_title | Вопросы атомной науки и техники |
| description | This paper is devoted to brief review of main experimental results of investigations of high-power quasi-stationary plasma dynamic systems in the IPP NSC KIPT. In experiments were shown that to received accelerated plasma streams with high value of energy in quasi-stationary modes all conditions on the accelerating channel boundary should be controlled independently. As a results of optimizations of the modes of operation all QSPA active elements quasi-stationary plasma flow in the channel during 480 μs at discharge durations 550μs was obtained. The plasma streams velocity was close to theoretical limit for present experimental conditions. Plasma streams with maximum velocity up to 4.2·10⁷ cm/s and total value of energy containment in the stream 0.4…0.6 MJ were received. The main properties of compression zone formation in the plasma streams generated by magneto-plasma compressor in quasi-stationary modes were investigated. In experiments were shown that initial conditions, namely residual pressure in the vacuum chamber made a big influence on the value of plasma density in compression zone. Compressive plasma streams with density (2…4)·10¹⁸ cm⁻³ during 20…25μs at discharge duration 10μs were obtained. This value of plasma density is close to theoretical limit for present experimental conditions.
Работа посвящена краткому обзору основных экспериментальных результатов исследования мощных квазистационарных плазмодинамических систем в ИФП ННЦ ХФТИ. Показано, что для получения ускоренных потоков плазмы с большим энергосодержанием в квазистационарном режиме необходимо независимым образом управлять условиями на границах ускорительного канала. В результате оптимизации работы всех вспомогательных элементов КСПУ были получены квазистационарные течения плазмы с временем генерации 480 мкс при длительности разряда 550 мкс и скорости генерации, близкой к теоретическому пределу для данных экспериментальных условий. Получены плазменные потоки с максимальной скоростью 4.2·10⁷ см/с и полным энергосодержанием 0.4…0.6 МДж. Исследованы основные закономерности формирования компрессионных потоков плазмы, генерируемых в квазистационарном режиме магнито-плазменным компрессором. Показано, что начальные условия (в частности, давление рабочего газа) оказывают существенное влияние на плотность плазмы в зоне сжатия. Получены самосжимающиеся потоки с плотностью (2…4)·10¹⁸ см⁻³, близкой к теоретическому пределу для данных экспериментальных условий. Время существования зоны компрессии составляло 20…25 мкс при длительности разряда в МПК 10 мкс.
Робота присвячена короткому огляду основних експериментальних результатів дослідження потужних квазістаціонарних плазмодинамічних систем в ІФП ННЦ ХФТІ. Показано, що для отримання прискорених потоків плазми з великим енерговмістом у квазістаціонарному режимі необхідно незалежним чином керувати умовами на межах прискорювального каналу. У результаті оптимізації роботи всіх допоміжних елементів КСПП були отримані квазістаціонарні течії плазми з часом генерації 480 мкс при тривалості розряду 550 мкс та швидкістю генерації, близької до теоретичної межі для даних експериментальних умов. Були отримані плазмові потоки з максимальною швидкістю 4.2·10⁷ см/с і повним енерговмістом потоку 0.4...0.6 МДж. Досліджено основні закономірності формування компресійних потоків плазми, які генеруються магніто-плазмовим компресором у квазістаціонарному режимі. Показано, що початкові умови, зокрема тиск робочого газу, істотно впливають на густину плазми в зоні стиснення. Отримані самостискаючі потоки з густиною (2...4)·10¹⁸ см⁻³, яка близька до теоретичної межі для даних експериментальних умов. Час існування зони компресії становив 20...25 мкс при тривалості розряду в МПК 10 мкс.
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PLASMA DYNAMICS AND PLASMA-WALL INTERACTION
ISSN 1562-6016. ВАНТ. 2015. №1(95)
104 PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY. 2015, № 1. Series: Plasma Physics (21), p. 104-109.
HIGH-POWER PLASMA DYNAMIC SYSTEMS OF QUASI-STATIONARY TYPE
IN IPP NSK KIPT: RESULTS AND PROSPECTS
D.G. Solyakov
Institute of Plasma Physics of the NSC KIPT, Kharkov, Ukraine
E-mail: solyakov@ipp.kharkov.ua
This paper is devoted to brief review of main experimental results of investigations of high-power quasi-
stationary plasma dynamic systems in the IPP NSC KIPT. In experiments were shown that to received accelerated
plasma streams with high value of energy in quasi-stationary modes all conditions on the accelerating channel
boundary should be controlled independently. As a results of optimizations of the modes of operation all QSPA
active elements quasi-stationary plasma flow in the channel during 480 s at discharge durations 550 s was
obtained. The plasma streams velocity was close to theoretical limit for present experimental conditions. Plasma
streams with maximum velocity up to 4.2·10
7
cm/s and total value of energy containment in the stream 0.4…0.6 MJ
were received. The main properties of compression zone formation in the plasma streams generated by magneto-
plasma compressor in quasi-stationary modes were investigated. In experiments were shown that initial conditions,
namely residual pressure in the vacuum chamber made a big influence on the value of plasma density in
compression zone. Compressive plasma streams with density (2…4)·10
18
cm
-3
during 20…25 s at discharge
duration 10 s were obtained. This value of plasma density is close to theoretical limit for present experimental
conditions.
PACS: 52.70.Kz; 52.59.Dk; 52.50.Dg; 52.30.-q; 52.25.Xz.
INTRODUCTION
Interest for study the fundamental features of high-
power plasma dynamic quasi-stationary system and
plasma streams with unique complex parameters,
namely: time of generation, energy, density and ion
energy, is caused by their application in different fields
such as development of radiation sources, plasma
surface interactions, simulation of space events, plasma
technology, etc.
The principles of quasi-stationary plasma flow in
profile channel were formulated by prof. Morozov A.I.
[1]. It was proposed to made profiled channel (Fig. 1)
with discharge current flowing in radial direction and to
inject the working gas.
Fig. 1. Scheme of quasi-stationary plasma-dynamic
system
In this case plasma will be accelerated under Ampere
force . The maximum plasma stream
velocity can be estimated from Bernoulli equation [2] as
, where CA0 – Alfven velocity in the
channel entrance. In first experiments [3] the plasma
stream parameters are found to be so far from expected.
Because of that further theoretical investigations, under
prof. A.I. Morozov management, and numerical
calculations, under prof. K.V. Brushlinskij, were
performed. The main results of theoretical and
numerical investigations can be summarized as follows:
transition to ion current carry in the channel and two
stage acceleration to avoid the influence of ionization
zone instability on the plasma flow in the main
accelerating channel [4]. Theoretically it was shown
possibility to realize two modes of plasma dynamic
system operation: accelerating mode of operation when
input electrical energy transforms mainly to the plasma
stream kinetic energy and compression mode of
operation when energy transforms mainly to thermal
energy of compression zone.
REALIZATION OF THE MAIN PRINCIPLES
IN QUASI-STATIOARY PLASMA
ACCELERATORS AND RESULTS OF
PLASMA FLOW INVESTIGATIONS
The experimental investigations were started in the
Institute of Plasma Physics of NSC KIPT under
V.I. Tereshin’s management. The main principles of
quasi-stationary plasma acceleration were realized in
two experimental installations with road electrodes [5]
and with active magneto-plasma transformers [6] as
well. Both these accelerators were manufactured in two
stage scheme. The main attention in experiments was
paid to investigation of electrical current spatial
distributions in accelerating channel. As it was
mentioned above, the current should flow in radial
direction for effective plasma acceleration. A number of
small in size (maximum diameter 5 mm) magnetic
probes were used for electrical current spatial
distributions measurements.
QUASI-STATIONARY PLASMA
ACCELERATOR WITH ROAD
ELECTRODES
The QSPA with road electrodes (Fig. 2) has
cylindrical anode with diameter 50 cm and length
ISSN 1562-6016. ВАНТ. 2015. №1(95) 105
80 cm. Profile cathode with maximum diameter 32 cm
and length 60 cm. The first stage consists of 4 small
plasma accelerators with solid electrodes and anode
diameter 8 cm. Working gas, hydrogen, flows from first
stage and feels up main accelerating channel and outer
anode volume. This gas is used for ion current carry. In
some experiments outer plastic glass screen was used to
keep gas close to anode surface and to support discharge
current by additional ions. Capacitor bank with capacity
3600 F and maximum voltage 9 kV was used as a
power supply system. Maximum value of discharge
current in the main accelerating channel was 400 kA.
The accelerator was installed into vacuum chamber with
diameter 100 cm and length 400 cm.
Fig. 2. General view of the QSPA with road electrodes
Experimental investigations showed that electrical
current spatial distributions strongly depend on channel
boundary conditions, input part, anode and cathode
surfaces also. Spatial distributions of current and
electrical potential in accelerating channel of QSPA
with road electrodes in optimal mode of operation with
outer screen are shown in Fig. 3 [7].
Fig. 3. Spatial distributions of current and potential in
accelerating channel of QSPA with road electrodes
As we can see from this figure discharge current
flows mainly in radial direction during 40…50 s. After
that current lines sliding along electrodes surfaces is
observed with formation of current vortex. Thus, the
duration of regular plasma flow, when current flows
mainly in radial direction, is about 20…30 s and it is
equal to 2…4 flight-time of particles along the
acceleration channel. In non optimal mode of operation,
namely without outer screen, when decreased discharge
support by ions from anode surface the duration of
regular plasma flow decreased to 10 s or not set in at
all.
Two different types of current vortex were
discovered: in input channel cross section and based on
cathode surface. The nature of these vortexes is
completely different. It was found experimentally that
plasma volume between first and second stage of
accelerator is equipotential. It means, that plasma
streams generated by input ionization chambers are
decelerated and do not reach the main accelerating
channel. In this case kinetic energy of plasma streams is
transformed to energy of magnetic field in current
vortex and partially to plasma thermal energy. Electron
temperature in the input part of accelerating channel
was estimated from volt-ampere characteristics of
double electric probe and it was about 10…30 eV. At
the same time in other parts of plasma stream electron
temperature was about 2…4 eV.
Experimentally it was discovered that during plasma
flow establishment (first 10…15 s) there is non
equipotential thing plasma layer (0.5…1 cm) close to
the cathode surface. Tangential to cathode surface
component of electric field is generated. Thus, in
crossed tangential electric field and azimuthal magnetic
field plasma drifts to cathode volume. Plasma density in
cathode volume are reach value (2…3).10
17
cm
-5
during
first 10…15 s of discharge. At the same time, density
in accelerating channel is about 10
15
cm
-3
[8]. After that
short period of time tangential to cathode surface
component of electric field disappears, drift into cathode
volume became stopped and plasma along with frozen
magnetic field moved back to accelerating channel
forming the current vortex.
Based on experimental results of investigations of
plasma flow in accelerating channel formed by road
electrodes one possible to made several important
conclusions: 1 – it is possible to receive regular plasma
flow in accelerating channel in quasi-stationary regimes;
2 – the duration of regular plasma flow strongly
depends on accelerating channel boundary conditions;
3 – to receive regular plasma flow in accelerating
channel during several tens or several hundreds s the
channel boundary conditions should be controlled
independently.
QUASI-STATIONARY PLASMA
ACCELERATOR WITH ACTIVE
MAGNETO-PLASMA ELECTRODES-
TRANSFORMERS
The QSPA Kh-50 with active magneto-plasma
electrodes-transformes was designed, manufactured and
built in IPP NSC KIPT [6]. The block diagram of full-
scale QSPA is shown in Fig. 4.
The accelerating channel of QSPA Kh-50 is formed
by active anode transformer with average diameter
50 cm and length 80 cm. Anode transformer contains
10 anode ionization chambers which support discharge
by ions to supply ion current carry in the channel and
independent magnetic system which forms magnetic
emitting surface. Profiled part of cathode transformer
has maximum diameter 32 cm and length 60 cm. The
first stage of accelerator consists of 5 input ionization
chambers. First and second stages are separated by drift
chamber with length 60 cm. All accelerator systems
106 ISSN 1562-6016. ВАНТ. 2015. №1(95)
powered by capacitor banks with total energy up to
4 MJ. Maximum value of discharge current in the main
accelerating channel was about 1 MA. The accelerator
was installed into the vacuum chamber with diameter
1.5 m and length 10 m.
Fig. 4. The block diagram of full-scale QSPA:
1 − anode collector; 2 – anode collectors;
3 – independent anode magnetic system; 4 – cathode
transformer; 5 – anode ionization chambers (AIC);
6 – drift channel; 7 – input ionization chambers (IIC);
8 – independent cathode magnetic system;
9 – electron emitters
It was found that plasma flow parameters strongly
depend on modes of operation of each active element of
full-scale QSPA, namely:
- IIC (five IICs) mass flow rate, discharge current,
time of discharge ignition;
- AIC (ten AICs) mass flow rate, discharge current,
time delay of discharge start);
- Start time of discharge in each element;
- Current value in the magnetic system of anode
transformer;
- Value and direction of current in the magnetic
system of cathode transformer.
The spatial distributions of electrical current in
accelerating channel of full-scale QSPA in optimal
mode of operation for all active elements of accelerator
are presented in Fig. 5 [9]. As we can see from this
picture current flows mainly in radial direction during
200…250 s. If even one active element of QSPA
operated in non-optimal mode, regular plasma flow in
accelerating channel was not observed. For example, if
magnetic system of cathode transformer is switched off
and plasma can drift into cathode volume, current
vortex close to cathode surface is generated and
discharge current is slighting along the cathode surface.
Current vortex in input part of the accelerating channel
is caused by deceleration of plasma streams, generated
by IIC. Spatial distributions of plasma potential and
radial distributions of plasma density were measured in
drift chamber. It was shown that practically all volume
of drift chamber is equipotential and plasma passed
from IIC to main accelerating channel in thin layer
close to the drift chamber wall. In this case radial
distribution of plasma density do not feet theoretical
dependence .
Fig. 5. Spatial distributions of electrical current in
accelerating channel of QSPA with magneto-plasma
electrodes-transformers
The effective method for correction of plasma density
radial distribution was realized [10]. It was proposed to
generate Ampere force by applying additional
discharge between the drift chamber wall and cathodes
of each IIC. The principle scheme of Ampere force
generation is presented in Fig. 6.
Fig. 6. The principle scheme of additional Ampere force
generation in drift chamber
The current of additional discharge and magnetic field
of the main discharge current produced Ampere force
that moved plasma both to the accelerating channel and
to the axis of system. As result of additional correction
discharge the regular plasma flow without any current
vortex was obtained in the main accelerating channel of
the QSPA with magneto-plasma electrodes-transformes
during 230…250 s (Fig. 7). In this mode of operation
radial distribution of plasma density in the input part of
accelerating channel is close to theoretical dependence
.
In most experiments the time dependence of
discharge current was close to sinusoidal or to critical
apeoridical discharge wave form.
ISSN 1562-6016. ВАНТ. 2015. №1(95) 107
Fig. 7. Spatial distributions of electrical current in
accelerating channel of QSPA with magneto-plasma
electrodes-transformers with additional correction
discharge
However in some cases, it is important to form const
discharge current profile during several hundreds s.
The power supply system of the main discharge of
QSPA consists of 6 parts and each part can be switch on
in different time moments. Example of adjusted ignition
of each part of battery and time dependence of
discharge current are shown in Fig. 8. The discharge
current is changed very slowly during 250…300 s.
Fig. 8. Time dependences of discharge current Ip,
discharge voltage Up and radial component of electric
field Er
Several separate peaks corresponding to switching
on the different parts of capacitor banks are observed on
discharge voltage wave form. At the same time wave
form of the radial component of electric field, measured
in the central part of accelerating channel, is very close
to wave form of discharge current. It shows that electric
field in plasma stream has Lorentz nature.
Important characteristic of the plasma streams,
generated by QSPA, is stream velocity. As follows from
theoretical estimation the maximal velocity is
, where CA0 – Alfven velocity in the
channel entrance. Fig. 9 presents dependences of plasma
stream velocity for two different QSPA modes of
operations [11]: short pulse with discharge duration 300
s (1) and long pulse with discharge duration 550 s
(2). Points indicate the results of measurements and
curves represent the value of calculated maximum
velocity, based on measured values of magnetic field
and plasma density in the input part of accelerating
channel. As we can see experimentally measured
velocity and
calculated maximal velocity are in good agreement.
Thus, QSPA with magneto-plasma electrodes-
transformers generated the plasma streams during
20…30 s in short pulse mode of operation (that
corresponds to 10…15 times of particle flights along
accelerating channel) and during 300…350 s
(~ 100…150 flight times) in long pulse mode of
operation.
Fig. 9. Time dependencies of plasma stream velocity.
1 – short pulse mode of operation; 2 – long pulse mode
of operation
Based on obtained experimental data one possible to
conclude that accelerating asymptotic of Bernoulli
equation has been realized experimentally in quasi-
stationary mode.
PLASMA FLOW IN MAGNETO-PLASMA
COMPRESSOR
As follow from Bernoulli equation the maximum
value of plasma density in compression zone can be
estimated as:
where n0 – initial
density (concentration) of working gas; γ – adiabatic
coefficient, CA0 and CT0 Alfven and thermal velocity in
the input part of magnetoplasma compressor (MPC)
channel respectively. As follow from theoretical
investigations [2] the average width and radius of MPC
channel should decreased along axis. Such magneto-
plasma device was designed and investigated [12]. The
general view of MPC is presented in Fig. 10. The MPC
channel forms by solid conical cathode and roads
conical anode with diameter in output part 8 cm. The
total channel length is 12 cm. Capacitor bank with
maximum voltage 25 kV was applied as power supply
system. MPC was installed into vacuum chamber with
diameter 40 cm and length 200 cm. Maximum value of
discharge current ~ 600 kA and discharge duration
10…12 s. The helium was used as working gas and all
experiments were carrying out with residual gas in
vacuum chamber under different pressures.
0 100 200 300 400 500 600
Er
Up
Time, s
Ip
0 100 200 300 400 500 600
0
5
10
15
20
25
30
V
e
lo
c
it
y
,
1
0
6
c
m
/s
Time, s
1
2
108 ISSN 1562-6016. ВАНТ. 2015. №1(95)
The main attention in present experiments was paid
to investigation of spatial distributions of electrical
current that flows outside the channel, in plasma stream,
generated by MPC [13]. Based on experimentally
measured distributions of electrical current the spatial
distribution of electro-magnetic force was calculated.
The example of spatial distribution of current in plasma
stream for initial pressure of helium 2 Torr are
presented in Fig. 11.
Fig. 11. Spatial distribution of electric current in
plasma stream, generated by MPC
Current displacement from the axis region is
observed close to the MPC output. The toroidal current
vortex is generated in plasma stream at the distance
10…20 cm from MPC output. At distance 4…7 cm
from MPC output the radial component of current
density has a positive sign. In this case the longitudinal
component of electromagnetic force decelerates plasma
stream in this region. At the same time radial
component of electromagnetic force moves the plasmas
stream to axis and forms compression zone.
Fig. 12 presents temporal dependencies of plasma
stream density at the distance of 5 cm from MPC output
for two different initial gas pressures. It was found that
compression zone with density (2…3)·10
18
cm
-3
developed at the MPC output and existed during
20…25 s (discharge duration is 10 s). It means that
compression realized during 20…30 times of particles
flight along the MPC channel. The maximum value of
plasma density in compression zone can be estimated
from Bernoulli equation and for present experimental
conditions is about 1.8·10
18
cm
-3
. The value of plasma
temperature in compression region, as estimated from
pressure balance equation, is about 60...120 eV. Thus,
compression asymptotic of Bernoulli equation has been
realized experimentally in quasi-stationary mode. With
increasing initial gas pressure in vacuum chamber up to
10 Torr compression zone formation was not observed.
Fig. 12. Time dependencies of plasma stream density at
distance 5 cm from MPC output
CONCLUSIONS
The main principles of quasi-stationary plasma flow
in profiled channels were realized experimentally.
Accelerated plasma streams with velocities close to the
theoretical limits were obtained during 100…150 times
of particle flow along the channel. So, the accelerating
asymptotic of Bernoulli equation has been realized
experimentally in quasi-stationary mode. Dynamics of
the plasma flow in profiled channel was investigated. It
was shown that boundary conditions in accelerating
channel should be controlled independently to achieve
regular plasma flow, with radial current and without
potential jumps near the electrodes. Current vortexes
near the cathode and in the entrance of accelerating
channel were discovered. The reasons of current
vortexes formation were investigated and methods for
it’s suppression were proposed. In optimal QSPA mode
of operation the plasma streams with velocity up to
(4…4.2)·10
7
cm/s, energy density in axis region
25…30 MJ/m
2
and energy content in plasma stream of
0.4…0.6 MJ were obtained.
The dynamics of compression zone formation was
investigated. It was shown that electrical current and
electromagnetic force spatial distribution strongly
depend on initial experimental conditions, namely
working gas pressure in the vacuum chamber. As it was
demonstrated in experiments, plasma stream decelerated
in the compression zone and plasma kinetic energy
transformed into the thermal energy. The plasma density
and temperature achieved (2…4)·10
18
cm
-3
and
(60…120) eV in steady-state mode. It is close to the
theoretical predictions for chosen experimental
conditions. The compression zone with plasma density
close to theoretical limit for present experimental
condition existed during 20…25 s, that equal to
20…30 particle flight-times along the MPC channel.
Thus, the compressing asymptotic of Bernoulli equation
has been realized experimentally in quasi-stationary
mode.
Obtained results are in particular importance for
applications of QSPA in fusion relevant studies on
plasma-surface interactions [14-16] and for
technological applications of compressed plasma [17,
18].
-10 -5 302520151050
r
,
c
m
z, cm
120 10070
50
I = 05
Fig. 10. General view of MPC
0 10 20 30 40
1
10
P
la
sm
a
d
e
n
si
ty
,
1
0
1
7
c
m
-3
Time, s
40
Z = 5 cm
P = 2 torr
P = 10 torr
ISSN 1562-6016. ВАНТ. 2015. №1(95) 109
REFERENCES
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Article received 21.01.2015
МОЩНЫЕ КВАЗИСТАЦИОНАРНЫЕ ПЛАЗМОДИНАМИЧЕСКИЕ СИСТЕМЫ
В ИФП ННЦ ХФТИ: РЕЗУЛЬТАТЫ И ПЕРСПЕКТИВЫ
Д.Г. Соляков
Работа посвящена краткому обзору основных экспериментальных результатов исследования мощных
квазистационарных плазмодинамических систем в ИФП ННЦ ХФТИ. Показано, что для получения
ускоренных потоков плазмы с большим энергосодержанием в квазистационарном режиме необходимо
независимым образом управлять условиями на границах ускорительного канала. В результате оптимизации
работы всех вспомогательных элементов КСПУ были получены квазистационарные течения плазмы с
временем генерации 480 мкс при длительности разряда 550 мкс и скорости генерации, близкой к
теоретическому пределу для данных экспериментальных условий. Получены плазменные потоки с
максимальной скоростью 4.2·10
7
см/с и полным энергосодержанием 0.4…0.6 МДж. Исследованы основные
закономерности формирования компрессионных потоков плазмы, генерируемых в квазистационарном
режиме магнито-плазменным компрессором. Показано, что начальные условия (в частности, давление
рабочего газа) оказывают существенное влияние на плотность плазмы в зоне сжатия. Получены
самосжимающиеся потоки с плотностью (2…4)·10
18
см
-3
, близкой к теоретическому пределу для данных
экспериментальных условий. Время существования зоны компрессии составляло 20…25 мкс при
длительности разряда в МПК 10 мкс.
ПОТУЖНІ КВАЗІСТАЦІОНАРНІ ПЛАЗМОДИНАМІЧНІ СИСТЕМИ
В ІФП ННЦ ХФТІ: РЕЗУЛЬТАТИ ТА ПЕРСПЕКТИВИ
Д.Г. Соляков
Робота присвячена короткому огляду основних експериментальних результатів дослідження потужних
квазістаціонарних плазмодинамічних систем в ІФП ННЦ ХФТІ. Показано, що для отримання прискорених
потоків плазми з великим енерговмістом у квазістаціонарному режимі необхідно незалежним чином
керувати умовами на межах прискорювального каналу. У результаті оптимізації роботи всіх допоміжних
елементів КСПП були отримані квазістаціонарні течії плазми з часом генерації 480 мкс при тривалості
розряду 550 мкс та швидкістю генерації, близької до теоретичної межі для даних експериментальних умов.
Були отримані плазмові потоки з максимальною швидкістю 4.2·10
7
см/с і повним енерговмістом потоку
0.4...0.6 МДж. Досліджено основні закономірності формування компресійних потоків плазми, які
генеруються магніто-плазмовим компресором у квазістаціонарному режимі. Показано, що початкові умови,
зокрема тиск робочого газу, істотно впливають на густину плазми в зоні стиснення. Отримані
самостискаючі потоки з густиною (2...4)·10
18
см
-3
, яка близька до теоретичної межі для даних
експериментальних умов. Час існування зони компресії становив 20...25 мкс при тривалості розряду в МПК
10 мкс.
|
| id | nasplib_isofts_kiev_ua-123456789-82105 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 1562-6016 |
| language | English |
| last_indexed | 2025-11-29T03:10:12Z |
| publishDate | 2015 |
| publisher | Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| record_format | dspace |
| spelling | Solyakov, D.G. 2015-05-25T09:29:19Z 2015-05-25T09:29:19Z 2015 High-power plasma dynamic systems of quasi-stationary type in IPP NSK KIPT: results and prospects / D.G. Solyakov // Вопросы атомной науки и техники. — 2015. — № 1. — С. 104-109. — Бібліогр.: 18 назв. — англ. 1562-6016 PACS: 52.70.Kz; 52.59.Dk; 52.50.Dg; 52.30.-q; 52.25.Xz. https://nasplib.isofts.kiev.ua/handle/123456789/82105 This paper is devoted to brief review of main experimental results of investigations of high-power quasi-stationary plasma dynamic systems in the IPP NSC KIPT. In experiments were shown that to received accelerated plasma streams with high value of energy in quasi-stationary modes all conditions on the accelerating channel boundary should be controlled independently. As a results of optimizations of the modes of operation all QSPA active elements quasi-stationary plasma flow in the channel during 480 μs at discharge durations 550μs was obtained. The plasma streams velocity was close to theoretical limit for present experimental conditions. Plasma streams with maximum velocity up to 4.2·10⁷ cm/s and total value of energy containment in the stream 0.4…0.6 MJ were received. The main properties of compression zone formation in the plasma streams generated by magneto-plasma compressor in quasi-stationary modes were investigated. In experiments were shown that initial conditions, namely residual pressure in the vacuum chamber made a big influence on the value of plasma density in compression zone. Compressive plasma streams with density (2…4)·10¹⁸ cm⁻³ during 20…25μs at discharge duration 10μs were obtained. This value of plasma density is close to theoretical limit for present experimental conditions. Работа посвящена краткому обзору основных экспериментальных результатов исследования мощных квазистационарных плазмодинамических систем в ИФП ННЦ ХФТИ. Показано, что для получения ускоренных потоков плазмы с большим энергосодержанием в квазистационарном режиме необходимо независимым образом управлять условиями на границах ускорительного канала. В результате оптимизации работы всех вспомогательных элементов КСПУ были получены квазистационарные течения плазмы с временем генерации 480 мкс при длительности разряда 550 мкс и скорости генерации, близкой к теоретическому пределу для данных экспериментальных условий. Получены плазменные потоки с максимальной скоростью 4.2·10⁷ см/с и полным энергосодержанием 0.4…0.6 МДж. Исследованы основные закономерности формирования компрессионных потоков плазмы, генерируемых в квазистационарном режиме магнито-плазменным компрессором. Показано, что начальные условия (в частности, давление рабочего газа) оказывают существенное влияние на плотность плазмы в зоне сжатия. Получены самосжимающиеся потоки с плотностью (2…4)·10¹⁸ см⁻³, близкой к теоретическому пределу для данных экспериментальных условий. Время существования зоны компрессии составляло 20…25 мкс при длительности разряда в МПК 10 мкс. Робота присвячена короткому огляду основних експериментальних результатів дослідження потужних квазістаціонарних плазмодинамічних систем в ІФП ННЦ ХФТІ. Показано, що для отримання прискорених потоків плазми з великим енерговмістом у квазістаціонарному режимі необхідно незалежним чином керувати умовами на межах прискорювального каналу. У результаті оптимізації роботи всіх допоміжних елементів КСПП були отримані квазістаціонарні течії плазми з часом генерації 480 мкс при тривалості розряду 550 мкс та швидкістю генерації, близької до теоретичної межі для даних експериментальних умов. Були отримані плазмові потоки з максимальною швидкістю 4.2·10⁷ см/с і повним енерговмістом потоку 0.4...0.6 МДж. Досліджено основні закономірності формування компресійних потоків плазми, які генеруються магніто-плазмовим компресором у квазістаціонарному режимі. Показано, що початкові умови, зокрема тиск робочого газу, істотно впливають на густину плазми в зоні стиснення. Отримані самостискаючі потоки з густиною (2...4)·10¹⁸ см⁻³, яка близька до теоретичної межі для даних експериментальних умов. Час існування зони компресії становив 20...25 мкс при тривалості розряду в МПК 10 мкс. en Національний науковий центр «Харківський фізико-технічний інститут» НАН України Вопросы атомной науки и техники Динамика плазмы и взаимодействие плазма-стенка High-power plasma dynamic systems of quasi-stationary type in IPP NSK KIPT: results and prospects Мощные квазистационарные плазмодинамические системы в ИФП ННЦ ХФТИ: результаты и перспективы Потужні квазістаціонарні плазмодинамічні системи в ІФП ННЦ ХФТІ: результати та перспективи Article published earlier |
| spellingShingle | High-power plasma dynamic systems of quasi-stationary type in IPP NSK KIPT: results and prospects Solyakov, D.G. Динамика плазмы и взаимодействие плазма-стенка |
| title | High-power plasma dynamic systems of quasi-stationary type in IPP NSK KIPT: results and prospects |
| title_alt | Мощные квазистационарные плазмодинамические системы в ИФП ННЦ ХФТИ: результаты и перспективы Потужні квазістаціонарні плазмодинамічні системи в ІФП ННЦ ХФТІ: результати та перспективи |
| title_full | High-power plasma dynamic systems of quasi-stationary type in IPP NSK KIPT: results and prospects |
| title_fullStr | High-power plasma dynamic systems of quasi-stationary type in IPP NSK KIPT: results and prospects |
| title_full_unstemmed | High-power plasma dynamic systems of quasi-stationary type in IPP NSK KIPT: results and prospects |
| title_short | High-power plasma dynamic systems of quasi-stationary type in IPP NSK KIPT: results and prospects |
| title_sort | high-power plasma dynamic systems of quasi-stationary type in ipp nsk kipt: results and prospects |
| topic | Динамика плазмы и взаимодействие плазма-стенка |
| topic_facet | Динамика плазмы и взаимодействие плазма-стенка |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/82105 |
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