Dynamics of the main plasma parameters during spontaneous transition into the mode of improved confinement in torsatron U-3M
The work [1] contains discussion about the changes in plasma energy content and energy lifetime during the transition into the mode of improved confinement at RF-heating in torsatron U-3M in range of rare collision frequencies of plasma particles. It was proved, that both energy content of plasma vo...
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| Дата: | 2010 |
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України
2010
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Dynamics of the main plasma parameters during spontaneous transition into the mode of improved confinement in torsatron U-3M / V.K. Pashnev, E.L. Sorokovoy, A.A. Petrushenya, Yu.K. Mironov, V.G. Konovalov, A.N. Shapoval, A.S. Slavnyj, M.B. Dreval, A.P. Pugovkin // Вопросы атомной науки и техники. — 2010. — № 6. — С. 24-25. — Бібліогр.: 3 назв. — англ. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1860150129464442880 |
|---|---|
| author | Pashnev, V.K. Sorokovoy, E.L. Petrushenya, A.A. Mironov, Yu.K. Konovalov, V.G. Shapoval, A.N. Slavnyj, A.S. Dreval, M.B. Pugovkin, A.P. |
| author_facet | Pashnev, V.K. Sorokovoy, E.L. Petrushenya, A.A. Mironov, Yu.K. Konovalov, V.G. Shapoval, A.N. Slavnyj, A.S. Dreval, M.B. Pugovkin, A.P. |
| citation_txt | Dynamics of the main plasma parameters during spontaneous transition into the mode of improved confinement in torsatron U-3M / V.K. Pashnev, E.L. Sorokovoy, A.A. Petrushenya, Yu.K. Mironov, V.G. Konovalov, A.N. Shapoval, A.S. Slavnyj, M.B. Dreval, A.P. Pugovkin // Вопросы атомной науки и техники. — 2010. — № 6. — С. 24-25. — Бібліогр.: 3 назв. — англ. |
| collection | DSpace DC |
| description | The work [1] contains discussion about the changes in plasma energy content and energy lifetime during the transition into the mode of improved confinement at RF-heating in torsatron U-3M in range of rare collision frequencies of plasma particles. It was proved, that both energy content of plasma volume and energy lifetime increase as a result of transition into the mode of improved confinement. This increase is almost in 2 times. Temporal behavior of such plasma parameters as ion and electron temperature, plasma density and average charge state of plasma ions in the modes with improved confinement are discussed and reviewed in this work.
В торсатроне У-3М в режиме редких частот соударений проведены измерения энергосодержания плазмы и энергетического времени жизни. Показано, что при переходе в режим улучшенного удержания наблюдается почти двухкратное увеличение энергосодержания и энергетического времени жизни плазмы.
У торсатроні У-3М в режимі рідкісних частот зіткнень проведені вимірювання енерговмісту плазми та енергетичного часу життя. Показано, що при переході в режим поліпшеного утримання спостерігається майже двократне збільшення енерговмісту та енергетичного часу життя.
|
| first_indexed | 2025-12-07T17:51:02Z |
| format | Article |
| fulltext |
24 PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY. 2010. № 6.
Series: Plasma Physics (16), p. 24-25.
DYNAMICS OF THE MAIN PLASMA PARAMETERS DURING
SPONTANEOUS TRANSITION INTO THE MODE OF IMPROVED
CONFINEMENT IN TORSATRON U-3M
V.K. Pashnev, E.L. Sorokovoy, A.A. Petrushenya, Yu.K. Mironov,
V.G. Konovalov, A.N. Shapoval, A.S. Slavnyj, M.B. Dreval, A.P. Pugovkin
Institute of Plasma Physics NSC “Kharkov Institute of Physics and Technology”, Kharkov, Ukraine
E-mail: pashnev@kipt.kharkov.ua
The work [1] contains discussion about the changes in plasma energy content and energy lifetime during the
transition into the mode of improved confinement at RF-heating in torsatron U-3M in range of rare collision frequencies
of plasma particles. It was proved, that both energy content of plasma volume and energy lifetime increase as a result of
transition into the mode of improved confinement. This increase is almost in 2 times. Temporal behavior of such plasma
parameters as ion and electron temperature, plasma density and average charge state of plasma ions in the modes with
improved confinement are discussed and reviewed in this work.
PACS: 52.55.Dy, 52.55.Hc
1. MAIN RESULTS
Experimental conditions and temporal behavior of
plasma parameters are presented in [1]. Fig. 1 shows
temporal behavior: average plasma density ne, plasma
pressure ρ, calculated using diamagnetic measurements
[2], intensity of soft X-Ray radiation IXR, that has gone
through thin aluminum foil with thickness of 1 μm, and
average over the cross-section ion temperature measured
by charge exchange neutral energy analyzer. Besides,
Fig. 1 shows temporal behavior of calculated average
electron temperature Te and average charge number of
ions Z.
Fig. 1. The time behavior of the measured main plasma
parameters ne, Ti, IXR and calculated p, Te, Z. Symbol
cross denotes the value of Te and Z, obtained from the
conductivity of plasma at the time of transition in the
regime of improved confinement. The hatching denotes
the range of reliable results
Temporal behavior Te and Z is calculated according to
data of diamagnetic measurements i
i
iee TnTnp ∑+= ,
and ion temperature Ti, and radiation intensity of soft X-
Ray IXR. As it was shown in [2], temperature of impurity
ions is essentially lower than temperature of protons, and
their concentration is small, therefore, it can be written as:
p=ne(Te+αHTi). (1)
Here, αH= eH nn <1 – fraction of ions in discharge. For
simplicity, consider the case with only one category of
impurities with concentration αFe= eFe nn , i.e. plasma
contains only ions of hydrogen with ZP=1 and
iron=ZFe>>1. Assuming that
Z =
e
i
ii
n
Zn∑ 2
, (2)
it is easy to obtain
αH≅ 1-
1
1
−
−
FeZ
Z . (3)
Temporal behavior of intensity of soft X-Ray radiation
shows that essential decrease (more than in 3 times) of
radiation is observed in the mode of improved
confinement. And besides, insignificant increase of
radiation intensity is observed after transition, however,
further decline of X-Ray remains. According to [3],
expression for radiation intensity of soft X-Ray has the
form:
2/2/1 exp i
i
i
TE
eeXR ZnTnI ex ∑−∝ , (4)
or considering (2)
ex TE
eeXR ZTnI /2/12 exp −∝ . (5)
Here, Ex – minimal energy of X-Ray radiation passing
through the foil. In our experiments Ex << Te
and 1)/exp( ≈− ex TE . Then, expression (5) can be
rewritten as follows
2/12
eeXR ZTnI ∝ . (6)
Joint solution of expressions (1), (3) and (6) allows to
obtain temporal behavior Te(t) and Z(t). It was assumed
that our main impurity is iron with ZFe – linearly changing
25
during discharge from ZFe=8 to ZFe=11. The results of
calculations are given in the Fig. 2 and show that in
discharges with 1210≈en cm3 at Te=100…300 eV the
time of achieving of the charge of iron ion state
ZFe=8…11 is less than 2 ms.
Fig. 2. Dynamics of the appearance of maximum ion
charge Fe when plasma density 1210=en cm-3
Since absolute calibration of intensity IXR was not done,
we used the possibility to determine the value ZTe
2/3
according to plasma conductivity at the time of transition
into the mode of improved confinement. The work [1]
shows that longitudinal plasma current increases
drastically at the time of transition. Typical change of
current occurs with time τ = L/Ω. Therefore, value
ZTe
2/3 =1100±300 (eV)3/2 was determined at the time of
transition. Due to this, the following values were normalized:
Te(t) and Z(t). The results are given in the Fig. 1.
Fig. 1 shows that temporal behavior Te and Ti do not
differ very much from each other. With such low plasma
density, the energy exchange between electrons and ions
is insignificant during the time of discharge. Thus, we can
conclude that heating of electrons and ions is occurred
simultaneously. The main power at the same time is
absorbed by electrons as energy confinement in them is
significantly worse [2], and temperature is comparable
with ion temperature. Z(t) behavior shows that process of
self cleaning plasma from impurities take place just after
gas ionization. Z value increases slightly after transition
into the mode of improved confinement, but further on Z
value continues to decrease. The parameters of the plasma
seem to enable us to see the glow through CVI. However,
during experiments such radiation didn’t detect. A
possible explanation is the rapid withdrawal of impurities
from the confinement volume.
Mechanism of plasma self cleaning requires further
investigation. This issue is also discussed in the work [2].
2. CONCLUSIONS
1. Temporal behavior and electron temperature value were
obtained. Transition into the mode of improved
confinement leads to increase of both ion and electron
temperatures. Te changes from 190 before the transition
to 470 eV at the end of RF-pulse, Ti, correspondingly,
change from 190 to 270 eV. RF-heating of both
electron and ion plasma component takes place in the
studied mode.
2. Improvement of plasma energy confinement occurs,
mainly, due to decrease of losses of energy in electron
channel.
3. Temporal behavior of average charge plasma
composition was calculated. It is clear that process of
plasma self cleaning is observed. Mechanism of this
phenomenon requires further investigations.
REFERENCES
1. V.K. Pashnev, E.L. Sorokovoy, V.L. Berezhnyj, et al.
Transition into the mode of improved confinement in
torsatron U-3M in range of rare collision frequencies //
Problems of Atomic Science and Technology. Series
“Plasma Physics” (16). 2010, N 6, p.17-20.
2. V.K. Pashnev, P.Ya. Burchenko, A.V. Lozin, et al.
Energy confinement in the torsatron Uragan-3M during
the RF-heating mode // Problems of Atomic Science
and Technology. Series “Plasma Physics” (14). 2008,
N 6, p. 28-30.
3. D.J. Rose, M. Clark. Plasma and controlled fusion.
NY: “MIT Press and John Wiley, 1961 / Fizika plazmy
i upravljaemye termojadernye reakcii. M:
“Gosatomizdat”, 1963. p. 240 (Russian translation).
Article received 20.10.10
ПОВЕДЕНИЕ ОСНОВНЫХ ПАРАМЕТРОВ ПЛАЗМЫ ПРИ СПОНТАННОМ ПЕРЕХОДЕ
В РЕЖИМ УЛУЧШЕННОГО УДЕРЖАНИЯ В ТОРСАТРОНЕ У-3М
В.К. Пашнев, Э.Л. Сороковой, А.А. Петрушеня, Ю.К. Миронов, В.Г. Коновалов, А.Н. Шаповал,
А.С. Славный, M.Б. Древаль, А.П. Пуговкин
В торсатроне У-3М в режиме редких частот соударений проведены измерения энергосодержания плазмы и
энергетического времени жизни. Показано, что при переходе в режим улучшенного удержания наблюдается
почти двухкратное увеличение энергосодержания и энергетического времени жизни плазмы.
ПОВЕДІНКА ОСНОВНИХ ПАРАМЕТРІВ ПЛАЗМИ ПРИ СПОНТАННОМУ ПЕРЕХОДI НА РЕЖИМ
ПОЛІПШЕНОГО УТРИМАННЯ В ТОРСАТРОНI У-3М
В.К. Пашнєв, Е.Л. Сороковий, А.А. Петрушеня, Ю.К. Міронов, В.Г. Коновалов, А.М. Шаповал,
O.С. Славний, М.Б. Древаль, А.П. Пуговкін
У торсатроні У-3М в режимі рідкісних частот зіткнень проведені вимірювання енерговмісту плазми та
енергетичного часу життя. Показано, що при переході в режим поліпшеного утримання спостерігається майже
двократне збільшення енерговмісту та енергетичного часу життя.
|
| id | nasplib_isofts_kiev_ua-123456789-17448 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 1562-6016 |
| language | English |
| last_indexed | 2025-12-07T17:51:02Z |
| publishDate | 2010 |
| publisher | Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| record_format | dspace |
| spelling | Pashnev, V.K. Sorokovoy, E.L. Petrushenya, A.A. Mironov, Yu.K. Konovalov, V.G. Shapoval, A.N. Slavnyj, A.S. Dreval, M.B. Pugovkin, A.P. 2011-02-26T19:00:01Z 2011-02-26T19:00:01Z 2010 Dynamics of the main plasma parameters during spontaneous transition into the mode of improved confinement in torsatron U-3M / V.K. Pashnev, E.L. Sorokovoy, A.A. Petrushenya, Yu.K. Mironov, V.G. Konovalov, A.N. Shapoval, A.S. Slavnyj, M.B. Dreval, A.P. Pugovkin // Вопросы атомной науки и техники. — 2010. — № 6. — С. 24-25. — Бібліогр.: 3 назв. — англ. 1562-6016 https://nasplib.isofts.kiev.ua/handle/123456789/17448 The work [1] contains discussion about the changes in plasma energy content and energy lifetime during the transition into the mode of improved confinement at RF-heating in torsatron U-3M in range of rare collision frequencies of plasma particles. It was proved, that both energy content of plasma volume and energy lifetime increase as a result of transition into the mode of improved confinement. This increase is almost in 2 times. Temporal behavior of such plasma parameters as ion and electron temperature, plasma density and average charge state of plasma ions in the modes with improved confinement are discussed and reviewed in this work. В торсатроне У-3М в режиме редких частот соударений проведены измерения энергосодержания плазмы и энергетического времени жизни. Показано, что при переходе в режим улучшенного удержания наблюдается почти двухкратное увеличение энергосодержания и энергетического времени жизни плазмы. У торсатроні У-3М в режимі рідкісних частот зіткнень проведені вимірювання енерговмісту плазми та енергетичного часу життя. Показано, що при переході в режим поліпшеного утримання спостерігається майже двократне збільшення енерговмісту та енергетичного часу життя. en Національний науковий центр «Харківський фізико-технічний інститут» НАН України Магнитное удержание Dynamics of the main plasma parameters during spontaneous transition into the mode of improved confinement in torsatron U-3M Поведение основных параметров плазмы при спонтанном переходе в режим улучшенного удержания в торсатроне У-3М Поведінка основних параметрів плазми при спонтанному переходi на режим поліпшеного утримання в торсатронi У-3М Article published earlier |
| spellingShingle | Dynamics of the main plasma parameters during spontaneous transition into the mode of improved confinement in torsatron U-3M Pashnev, V.K. Sorokovoy, E.L. Petrushenya, A.A. Mironov, Yu.K. Konovalov, V.G. Shapoval, A.N. Slavnyj, A.S. Dreval, M.B. Pugovkin, A.P. Магнитное удержание |
| title | Dynamics of the main plasma parameters during spontaneous transition into the mode of improved confinement in torsatron U-3M |
| title_alt | Поведение основных параметров плазмы при спонтанном переходе в режим улучшенного удержания в торсатроне У-3М Поведінка основних параметрів плазми при спонтанному переходi на режим поліпшеного утримання в торсатронi У-3М |
| title_full | Dynamics of the main plasma parameters during spontaneous transition into the mode of improved confinement in torsatron U-3M |
| title_fullStr | Dynamics of the main plasma parameters during spontaneous transition into the mode of improved confinement in torsatron U-3M |
| title_full_unstemmed | Dynamics of the main plasma parameters during spontaneous transition into the mode of improved confinement in torsatron U-3M |
| title_short | Dynamics of the main plasma parameters during spontaneous transition into the mode of improved confinement in torsatron U-3M |
| title_sort | dynamics of the main plasma parameters during spontaneous transition into the mode of improved confinement in torsatron u-3m |
| topic | Магнитное удержание |
| topic_facet | Магнитное удержание |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/17448 |
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