Investigations of pulsed plasma streams generated by “Prosvet” device operated with different gases
The paper presents the investigations of plasma streams generated by pulsed plasma gun “Prosvet” operated with different gases: krypton (m = 84), nitrogen (m = 14) and helium (m = 4). Contour parameters of working gas spectral lines (full intensities and half-widths) are used for determination of...
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України
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| Zitieren: | Investigations of pulsed plasma streams generated by “Prosvet” device operated with different gases / O.V. Byrka, A.N. Bandura, V.V. Chebotarev, I.E. Garkusha, M.S. Ladygina, A.K. Marchenko, S.A. Trubchaninov, A.V. Tsarenko, P.B. Shevchuk, V.I. Tereshin // Вопросы атомной науки и техники. — 2006. — № 6. — С. 144-146. — Бібліогр.: 5 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1859607849475244032 |
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| author | Byrka, O.V. Bandura, A.N. Chebotarev, V.V. Garkusha, I.E. Ladygina, M.S. Marchenko, A.K. Trubchaninov, S.A. Tsarenko, A.V. Shevchuk, P.B. Tereshin, V.I. |
| author_facet | Byrka, O.V. Bandura, A.N. Chebotarev, V.V. Garkusha, I.E. Ladygina, M.S. Marchenko, A.K. Trubchaninov, S.A. Tsarenko, A.V. Shevchuk, P.B. Tereshin, V.I. |
| citation_txt | Investigations of pulsed plasma streams generated by “Prosvet” device operated with different gases / O.V. Byrka, A.N. Bandura, V.V. Chebotarev, I.E. Garkusha, M.S. Ladygina, A.K. Marchenko, S.A. Trubchaninov, A.V. Tsarenko, P.B. Shevchuk, V.I. Tereshin // Вопросы атомной науки и техники. — 2006. — № 6. — С. 144-146. — Бібліогр.: 5 назв. — англ. |
| collection | DSpace DC |
| container_title | Вопросы атомной науки и техники |
| description | The paper presents the investigations of plasma streams generated by pulsed plasma gun “Prosvet” operated with
different gases: krypton (m = 84), nitrogen (m = 14) and helium (m = 4). Contour parameters of working gas spectral
lines (full intensities and half-widths) are used for determination of spatial distributions of the electron density and
temperature. Temporal distributions of the spectral lines intensities (both neutrals and ions of working gas), impurity
spectral lines and continuum intensities are analyzed. Plasma stream velocity was estimated by time-of-flight method
between two monochromators (MUM) connected with photo-multiplier. Longitudinal distributions of the plasma
pressure for different time moments and varied distances from the accelerator output have been used for investigation of
the plasma stream dynamics and study the plasma compression in the focus region for different operational regimes of
plasma accelerator. Experiments show that operation regime of the accelerator and plasma stream parameters strongly
depend on the gas atomic mass.
|
| first_indexed | 2025-11-28T09:02:01Z |
| format | Article |
| fulltext |
144 Problems of Atomic Science and Technology. 2006, 6. Series: Plasma Physics (12), p. 144-146
INVESTIGATIONS OF PULSED PLASMA STREAMS GENERATED BY
“PROSVET” DEVICE OPERATED WITH DIFFERENT GASES
O.V. Byrka, A.N. Bandura, V.V. Chebotarev, I.E. Garkusha, M.S. Ladygina,
A.K. Marchenko, S.A. Trubchaninov, , P.B. Shevchuk, V.I. Tereshin
Institute of Plasma Physics, National Science Center “Kharkov Institute of Physics and Technology”,
Akademicheskaya Str.1, 61108, Ukraine, Kharkov
The paper presents the investigations of plasma streams generated by pulsed plasma gun “Prosvet” operated with
different gases: krypton (m = 84), nitrogen (m = 14) and helium (m = 4). Contour parameters of working gas spectral
lines (full intensities and half-widths) are used for determination of spatial distributions of the electron density and
temperature. Temporal distributions of the spectral lines intensities (both neutrals and ions of working gas), impurity
spectral lines and continuum intensities are analyzed. Plasma stream velocity was estimated by time-of-flight method
between two monochromators (MUM) connected with photo-multiplier. Longitudinal distributions of the plasma
pressure for different time moments and varied distances from the accelerator output have been used for investigation of
the plasma stream dynamics and study the plasma compression in the focus region for different operational regimes of
plasma accelerator. Experiments show that operation regime of the accelerator and plasma stream parameters strongly
depend on the gas atomic mass.
PACS: 52.30.-q, 52.70.-m, 52.50.-Dg
1. INTRODUCTION
Plasma accelerators of different types are used at present as
powerful sources of dense plasma streams for basic studies,
fusion-oriented experiments and for technological applications
[1,2]. Pulsed plasma processing of the constructional materials
and alloys results in improved physical and mechanical
properties of surface layers, and, in particular, increases the
microhardness and wear resistance. Reliable information about
plasma stream parameters is necessary for achievement of
optimal conditions of materials processing with plasma streams.
Dense plasma of heavy noble gases is also considered as
prospective source of intense radiation in different spectral
ranges.
Optical spectroscopy is one of the most precise methods of
the plasma characteristics measurements. It allows estimation of
the electron density and temperature, plasma stream velocity,
emission duration, temporal distributions of neutrals, ions and
continuum intensities during the plasma pulse. In this paper
spectroscopy studies were applied in combination with the
measurements of plasma pressure distributions and energy
characteristics of the plasma streams for comparative analysis of
operation regimes of pulsed plasma gun with gases of different
atomic mass.
2. EXPERIMENTAL SETUP
The experiments were carried out with “Prosvet” facility
[1], which consists of the coaxial plasma gun (anode Ø=14 cm,
cathode Ø = 4 cm) and vacuum chamber (length – 120 cm and
Ø = 100cm). Scheme of experimental device and the
diagnostics used in described experiments are presented in
fig.1. Power supply of plasma gun comes from the capacitor
battery with maximal voltage up to 25 kV. Discharge current is
~500 kA, typical discharge duration is 3…5 s. Accelerator
generates plasma streams with following parameters: ions
energy – from 0.4 to 2.5 keV, average electron density –
1016 cm-3, energy density – 25…30 J/ m2. Initial experimental
conditions for operation with different gases (krypton,
nitrogen, helium) are indicated in Table 1.
Table 1
3. EXPERIMENTAL RESULTS
Grating spectrograph DFS-452 was used for plasma
emission registration in section B (35 cm from electrodes
outlet) and near the target surface (target material – copper, Ø
– 5 cm). Plasma stream velocity was estimated by time-of-
flight method between two MUMs connected with PEM and
located on the distance 60 cm from each other. Velocity
He
(m=4)
N
(m=14)
Kr
(m=84)
Filled gas
quantity,
cm3/particles per
pulse
3.2/
8.6×1019
2.9/
7.8×1019
2.7/
7.3×1019
Pressure under
the valve, atm
22…23 22…23 22…23
Time delay , s 850 1100 1400
1
2 3
5
6 7
4
8
9
10
A B C
Fig.1. Scheme of experiment: 1 – insulator, 2 – anode,
3 – cathode, 4 – vacuum chamber, 5 – lens, 6 – rotary prism,
7 – spectrograph DFS-452, 8 – vacuum valve,
9 – target/piezodetector, 10 – monochromators MUM+PEM.
Lines of the measurements: A – 15 cm, B – 35 cm, C – 75 cm
from accelerator output
A.V. Tsarenko
145
distributions of krypton plasma stream versus the discharge
voltage are presented in fig.2. These data have been compared
with the velocity obtained using piezodetectors (peaks and fronts
of signals for different spatial regions of 10…75 cm from
accelerator output). The velocity values estimated by two
independent methods are in good agreement. Plasma stream
velocity increased from 4 to 8×106 cm/s with the discharge
voltage increase up to 20 kV. Helium plasma stream velocity is
determined similarly and its value is higher in one order of
magnitude – (1.5…2)×107 cm/s for U = 20 kV. This difference
in the velocity magnitude is explained by the significant atomic
masses difference He (m = 4) and Kr (m = 84).
15 16 17 18 19 20
1
2
3
4
5
6
7
8
9
10
Pressure peaks (35cm-75cm)
Pressure front (35cm-75cm)
Optical data (10cm-70cm)
Pressure front (10cm-75cm)
V
, 1
06
c
m
/s
U, kV
Velocity of krypton plasma stream
Fig.2. Krypton plasma stream velocity versus the discharge
voltage
Temporal evaluations of the separate spectral lines of a
neutrals, ions and continuum intensity have been performed
using monochromator (MDR-23) device. Registration
conditions for all gases were the same – in section A (15 cm
from the electrode outlets) at U=18 kV. Such information allows
to reconstruct the whole temporal evolution of neutrals, different
species of ions, impurities and continuum which quantitatively
characterized the plasma density behavior (I ~ Ne
2).
Intensive luminescence of the singly ionized helium atoms is
observed on 10 s after discharge ignition and continues during
5 s (fig.3). Helium neutrals luminescence has minimum at the
same time and then during 10 s its intensity increasing. So the
most compressed and dense helium plasma formation is
obtained on 10 s after discharge beginning with total duration ~
10 s. After that plasma is extended in the vacuum camera space
and the second peak of continuum intensity (on 40…45 s)
corresponds to the impurity appearance (CII).
KrII and continuum luminescence for krypton plasma are
practically corresponded in time (fig.4). Maximal intensity is
observed on 8…9 s after discharge beginning, but its total
duration is less than HeII and continuum intensity for helium
plasma, and equal to 7…8 s. However in this case impurities
are appeared considerably earlier – CuI-12 s and CII-19 s. It
can be explained that working gas mass Kr (84) and impurity
elements C (12), especially Cu (64), are more closed to each
other that for He plasma.
Electron density measurements were carried out using Stark
broadening of working gas spectral lines KrII (4739 , 4355 ,
4292 , 4355 ). Stark widths for these lines are available in [3].
Usually the linear Stark effect is obtained for neutral atoms and
quadratic one – for different species of ions. Helium Stark
theory is an exception as the neutral He atoms are exposed to
the quadratic effect and ions – to the linear one [4]. Electron
density and temperature calculations for helium plasma
interacted with copper target are performed in detail in [5].
5 10 15 20 25 30 35 40 45 50
0,01
0,1
1
CII 426 nm
HeI 587 nm, *10
cont 474 nm, *100
HeII 468 nm
In
te
ns
ity
, a
.u
.
T, µs
Helium plasma, U = 18 kV
Fig.3. Temporal evolutions of HeI, HeII, CII spectral
lines and continuum intensity
Measurements of the plasma pressure spatial distributions
have been used for analysis of the plasma stream dynamics and
study the plasma compression in the focus region for different
operational regimes and working gases (fig.5). Plasma
parameters measured for different working gases are
summarized in Table 2.
Table 2
Plasma
parameters
He
(m=4)
N
(m=14)
Kr
(m=84)
V, cm/s 2×107 1×107 0.7×107
, s 6-8 5 3.5
Ne, cm-3 7×1016 0.8×1016 0.07×1016
Te, eV 5…5.3 3.5…4
P, atm
10 cm/35 cm 29/13 27/11 7/6.5
Eion, keV 0.48 0.75 1.5…2.5
J, J/cm2
10 cm/35 cm 42/30 40/24 16/10
5 10 15 20 25
0,01
0,1
1
In
te
ns
ity
, a
.u
.
T, µs
KrII 435 nm
Icont 498 nm
KrI 557 nm
CII 426 nm
CuI 515 nm
Krypton plasma, U = 18 kV
Fig.4. Temporal distributions of KrI, KrII, CII, CuI
spectral lines and continuum intensity
146
Fig.5. Spatial distributions of the plasma pressure
4. CONCLUSIONS
Basic plasma characteristics have been investigated for
pulsed plasma gun operation with different working gases
(He, N, Kr). Electron density and plasma stream velocity
were estimated by two independent methods (optical
spectroscopy and piezodetectors). These data are in a good
agreement.
Plasma pressure and energy density are decreased with
atomic mass increasing. At the same time the average
energy of ions has higher value.
Spectral lines of working gas ions and impurities were
analyzed for all gases. At first, pure plasma of working gas ions
is formed and the impurities are coming later on.
Spatial distributions of the pressure and energy density in
plasma stream were measured. Obtained results show the
possibility of effective variation of plasma stream parameters
which is necessary for technological applications of dense
plasma streams.
ACKNOWLEDGEMENTS
This work has been supported in part by STCU
project # 3378.
REFERENCES
1. I.E. Garkusha et al.//Proc. of the 5th Conference on
Modification of Materials with Particle Beams and Plasma
Flows, Tomsk, Russia, 2000. p. 299-302.
2. V.V.Chebotarev, I.E. Garkusha et al. // Problems of Atomic
Science and Technology. Ser.: “Plasma Physics” 1999, 3(3),
4(4), p. 191-193.
3. L.C. Popovic, M.S. Dimitrijevic.//Astron. Astrophys. Suppl.
Ser. 1998, v. 127, p. 295-297.
4. T.L. Pittman, C. Fleurier // Phys. Rev. 1986, v. A33, p. 1291.
5. A.N. Bandura et al. //Problems of Atomic Science and
Technology. Series ”Plasma Physics”(11). 2005, N 2,
p. 104-106.
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|
| id | nasplib_isofts_kiev_ua-123456789-82154 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 1562-6016 |
| language | English |
| last_indexed | 2025-11-28T09:02:01Z |
| publishDate | 2006 |
| publisher | Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| record_format | dspace |
| spelling | Byrka, O.V. Bandura, A.N. Chebotarev, V.V. Garkusha, I.E. Ladygina, M.S. Marchenko, A.K. Trubchaninov, S.A. Tsarenko, A.V. Shevchuk, P.B. Tereshin, V.I. 2015-05-25T16:04:11Z 2015-05-25T16:04:11Z 2006 Investigations of pulsed plasma streams generated by “Prosvet” device operated with different gases / O.V. Byrka, A.N. Bandura, V.V. Chebotarev, I.E. Garkusha, M.S. Ladygina, A.K. Marchenko, S.A. Trubchaninov, A.V. Tsarenko, P.B. Shevchuk, V.I. Tereshin // Вопросы атомной науки и техники. — 2006. — № 6. — С. 144-146. — Бібліогр.: 5 назв. — англ. 1562-6016 PACS: 52.30.-q, 52.70.-m, 52.50.-Dg https://nasplib.isofts.kiev.ua/handle/123456789/82154 The paper presents the investigations of plasma streams generated by pulsed plasma gun “Prosvet” operated with different gases: krypton (m = 84), nitrogen (m = 14) and helium (m = 4). Contour parameters of working gas spectral lines (full intensities and half-widths) are used for determination of spatial distributions of the electron density and temperature. Temporal distributions of the spectral lines intensities (both neutrals and ions of working gas), impurity spectral lines and continuum intensities are analyzed. Plasma stream velocity was estimated by time-of-flight method between two monochromators (MUM) connected with photo-multiplier. Longitudinal distributions of the plasma pressure for different time moments and varied distances from the accelerator output have been used for investigation of the plasma stream dynamics and study the plasma compression in the focus region for different operational regimes of plasma accelerator. Experiments show that operation regime of the accelerator and plasma stream parameters strongly depend on the gas atomic mass. This work has been supported in part by STCU project # 3378. en Національний науковий центр «Харківський фізико-технічний інститут» НАН України Вопросы атомной науки и техники Plasma dynamics and plasma wall interaction Investigations of pulsed plasma streams generated by “Prosvet” device operated with different gases Article published earlier |
| spellingShingle | Investigations of pulsed plasma streams generated by “Prosvet” device operated with different gases Byrka, O.V. Bandura, A.N. Chebotarev, V.V. Garkusha, I.E. Ladygina, M.S. Marchenko, A.K. Trubchaninov, S.A. Tsarenko, A.V. Shevchuk, P.B. Tereshin, V.I. Plasma dynamics and plasma wall interaction |
| title | Investigations of pulsed plasma streams generated by “Prosvet” device operated with different gases |
| title_full | Investigations of pulsed plasma streams generated by “Prosvet” device operated with different gases |
| title_fullStr | Investigations of pulsed plasma streams generated by “Prosvet” device operated with different gases |
| title_full_unstemmed | Investigations of pulsed plasma streams generated by “Prosvet” device operated with different gases |
| title_short | Investigations of pulsed plasma streams generated by “Prosvet” device operated with different gases |
| title_sort | investigations of pulsed plasma streams generated by “prosvet” device operated with different gases |
| topic | Plasma dynamics and plasma wall interaction |
| topic_facet | Plasma dynamics and plasma wall interaction |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/82154 |
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