7 results on '"K Annou"'
Number of results to display per page
Search Results
2. Effect of nonthermal ion distribution and dust temperature on nonlinear dust-acoustic solitary waves
- Author
-
K. Annou and R. Annou
- Subjects
Physics ,Dusty plasma ,Inertial frame of reference ,General Physics and Astronomy ,Electron ,complex mixtures ,respiratory tract diseases ,Ion ,Pseudopotential ,Nonlinear system ,Physics::Plasma Physics ,Physics::Space Physics ,Negative potential ,Astrophysics::Solar and Stellar Astrophysics ,Ion distribution ,Astrophysics::Earth and Planetary Astrophysics ,Atomic physics ,Astrophysics::Galaxy Astrophysics - Abstract
Dust-acoustic solitary waves in unmagnetized dusty plasma whose constituents are inertial charged dust grains, Boltzmannian electrons and nonthermal ions have been investigated by taking into account finite dust temperature. The pseudopotential has been used to study solitary solution. The existence of solitary waves having negative potential is reported.
- Published
- 2011
- Full Text
- View/download PDF
3. Cairns-Gurevich equation for soliton in plasma expansion into vacuum
- Author
-
Djemai Bara, K. Annou, and Djamila Bennaceur-Doumaz
- Subjects
Physics ,Context (language use) ,Acoustic wave ,Plasma ,Electron ,Condensed Matter Physics ,Laser ,Ion ,law.invention ,Distribution function ,Physics::Plasma Physics ,law ,Quantum electrodynamics ,Physics::Space Physics ,Soliton - Abstract
Plasma expansion and soliton formation in laser created plasma are addressed. Nonlinear acoustic waves in plasma where the combined effect of trapped and non-thermal electrons are dealt with, in plasma expansion are studied. Using the perturbation method, a modified Korteweg–de Vries equation (mKdV) that describes how the ion acoustic waves (IAW) are derived. The plasma is modeled by a Cairns distribution function for non-thermal electrons combined with Gurevich distribution function for the trapped electrons. It is found that parameters taken into account have significant effects on the properties of nonlinear waves as well as on plasma expansion into vacuum. We point out, that this work has been motivated by space and laboratory plasma observations of plasmas containing energetic particles, combined with trapped particles. Furthermore, this study is of interest in the context of the investigation of mono-energetic ion beams from intense laser interactions with plasmas.
- Published
- 2015
- Full Text
- View/download PDF
4. Achievement of High Fusion Performance in JT-60U Reversed Shear Discharges
- Author
-
H Kishimoto, K. Ushigusa, Y. Nakamura, T Hirayama, Kenji Tobita, H. Ichige, T Aoyagi, N. Isozaki, S Takahashi, Katsuhiro Shimizu, S Konoshima, Y. Toyokawa, A. Kaminaga, Nobuyuki Asakura, S. D. Scott, G. J. Kramer, M. Yamagiwa, G. Kurita, K Itami, S Nagaya, M. Nagami, M. Kazawa, S Kitamura, Y. Onose, T. Miura, T Kimura, N Ebisawa, T. Tuda, K. Tsuchiya, T. Fujita, T Sasajima, Takashi Yamamoto, A. Sakasai, Yoshinori Kusama, M Terakado, M Seimiya, J. Okano, A. Honda, M Isaka, K. Masaki, M. Shimono, S. Higashijima, N. Miya, S. Gunji, M Kikuchi, M Takahashi, H Hiratsuka, K Suganuma, O. Da Costa, M Shimizu, N Akino, K Yokokura, S. Takeji, Tomonori Takizuka, N Ogiwara, H. Seiki, Y. Neyatani, R. Budny, T Sugie, J. Koog, Yujiro Ikeda, K Arakawa, Yasunori Kawano, Yutaka Kamada, M. Matukawa, M. Ohsawa, K Kodama, K. Mogaki, Y Tsukahara, T Totsuka, Hiroshi Tamai, M. Saidoh, Mitsuru Honda, Shinji Tokuda, T Arai, M. Morimoto, Kiyotaka Hamamatsu, N. Isei, K Usui, A. Isayama, T Tsugita, D. Kazama, Y. Hasegawa, Satoshi Chiba, Hidenobu Takenaga, M Yamamoto, Michiyasu Mori, Takeo Nishitani, Shunsuke Ide, N. Saito, Soichi Omori, Masahiro Sato, S. Sakurai, H Oohara, Takeshi Ohshima, K Omori, S. Hirauchi, O Yamashita, J Yagyu, A. Funahashi, T. Okabe, Yasuaki Kishimoto, T. Fukuda, Takahisa Ozeki, S Sakata, M. Seki, K. Annou, S Moriyama, H Sunaoshi, T. Hatae, A. Nagashima, Takashi Kondoh, T. Kashiwabara, R. Yoshino, T Ohga, K Kiyono, Y Uramoto, S. Ishida, H. Kimura, T. Oikawa, M Kawai, T. Matsumoto, Y Miyo, M. Saigusa, Masafumi Azumi, K Miyachi, T. Fujii, N. Toyoshima, Hirotaka Kubo, N. Hosogane, H Akasaka, K Nagashima, H. Miyata, Yoshihiko Koide, S. Kokusen, S Shinozaki, M. Shimada, T Itoh, S. Morioka, Y. Ishii, M. Nemoto, M Shitomi, O. Naito, T Terakado, Y Kawamata, Maiko Yoshida, H. Yoshida, K Kurihara, T. Iwahashi, Y Omori, Tatsuma D. Matsuda, M. Kuriyama, L. Grisham, and H Shirai
- Subjects
Physics ,Shear (sheet metal) ,Thermonuclear fusion ,Tokamak ,law ,General Physics and Astronomy ,Electron ,Radius ,Plasma ,Atomic physics ,Bootstrap current ,law.invention ,Ion - Abstract
Fusion performance of reversed shear discharges with an {ital L}-mode edge has been significantly improved in a thermonuclear dominant regime with up to 2.8 MA of plasma current in the JT-60U tokamak. The core plasma energy is efficiently confined due to the existence of persistent internal transport barriers formed for both ions and electrons at a large minor radius of r/a{approximately}0.7 near the boundary of the reversed shear region. In an assumed deuterium-tritium fuel, the peak fusion amplification factor defined for transient conditions involving the dW/dt term would be in excess of unity. {copyright} {ital 1997} {ital The American Physical Society}
- Published
- 1997
- Full Text
- View/download PDF
5. Formation Of Voids In Dusty Lorentzian Plasma
- Author
-
S. Bahamida, K. Annou, R. Annou, José Tito Mendonça, David P. Resendes, and Padma K. Shukla
- Subjects
Physics ,Spectral index ,Physics::Plasma Physics ,Plasma instability ,Dust particles ,Plasma diagnostics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Plasma ,Atomic physics ,Vortex ,Ion ,Plasma density - Abstract
We study the possibility of formation of voids in y Lorentzian plasmas containing of dust particles obeying to vortex‐like velocity distribution. The size of the void is found to be ion spectral index dependent.
- Published
- 2008
- Full Text
- View/download PDF
6. Recent results of LH experiments on the JT-60 tokamak
- Author
-
N Akaoka, H Akasaka, M Akiba, N Akino, T Ando, K Annou, T Aoyagi, T Arai, K Arakawa, M Araki, M Azumi, S Chiba, M Dairaku, N Ebisawa, T Fujii, T Fukuda, A Funahashi, H Furukawa, H Gunji, K Hamamatsu, M Hanada, M Hara, K Haraguchi, H Hiratsuka, T Hirayama, S Hiroki, K Hiruta, M Honda, H Horiike, N Hosogane, Y Iida, T Iijima, K Ikeda, Y Ikeda, T Imai, T Inoue, N Isaji, M Isaka, N Isei, S Ishida, K Itami, N Itige, T Ito, T Kakizaki, Y Kamada, A Kaminaga, T Kaneko, M Kawai, M Kawabe, Y Kawamata, Y Kawano, K Kikuchi, M Kikuchi, H Kimura, T Kimura, H Kishimoto, S Kitamura, K Kiyono, K Kodama, Y Koide, T Koide, T Kobayashi, M Komata, I Kondo, T Kondo, S Konoshima, H Kubo, S Kunieda, K Kurihara, M Kuriyama, M Kusaka, Y Kusama, T Kushima, M Maeno, T Matoba, S Matsuda, M Matsukawa, M Matsuoka, Y Matsuzaki, Y Miura, N Miya, K Miyachi, K Miyake, Y Miyo, M Mizuno, K Mogaki, S Moriyama, Y Murakami, M Muto, M Nagami, A Nagashima, K Nagashima, T Nagashima, S Nagaya, K Nagayama, O Naito, H Nakamura, T Nagafuji, H Nemoto, M Nemoto, Y Neyatani, H Ninomiya, N Nishino, T Nishitani, H Nobusaka, H Nomata, A Oikawa, K Obara, K Odajima, N Ogiwara, T Ohga, Y Ohara, H Oohara, T Ohshima, K Ohta, M Ohta, S Ohuchi, Y Ohuchi, H Okumura, K Omori, S Omori, Y Omori, T Ozeki, M Saegusa, N Saitoh, A Sakasai, S Sakata, T Sakuma, T Sasajima, K Satou, M Satou, M Sawahata, M Seimiya, M Seki, S Seki, K Shibanuma, M Shimada, K Shimizu, M Shimizu, Y Shimomura, S Shinozaki, H Shirai, H Shirakata, M Shitomi, K Suganuma, T Sugawara, T Sugie, H Sunaoshi, M Suzuki, N Suzuki, S Suzuki, H Tachibana, M Takahashi, S Takahashi, T Takahashi, M Takasaki, H Takatsu, H Takeuchi, A Takeshita, T Takizuka, S Tamura, S Tanaka, T Tanaka, Y Tanaka, T Tani, M Terakado, T Terakado, K Tobita, T Totsuka, N Toyoshima, T Tsugita, S Tsuji, Y Tsukahara, M Tsuneoka, K Uehara, Y Uramoto, H Usami, K Ushigusa, K Usui, J Yagyu, K Yamagishi, M Yamagiwa, M Yamamoto, O Yamashita, T Yamazaki, K Yokokura, K Yokoyama, H Yoshida, Z Yoshida, R Yoshino, Y Yoshioka, I Yonekawa, and K Watanabe
- Subjects
Materials science ,Tokamak ,Divertor ,Atmospheric-pressure plasma ,Plasma ,Condensed Matter Physics ,Instability ,Ion ,law.invention ,Nuclear Energy and Engineering ,law ,Atomic physics ,JT-60 ,Electric current - Abstract
Recent lower hybrid current drive (LHCD), and heating (LHH) experiments on JT-60 are reported. The current drive product of neRpIRF approximately 12.5*1019 m-2 MA was achieved at the LH power of approximately 4.5 MW, and the CD efficiency, the energy confinement, the global power balance and the heat load on divertor plates were investigated in high power LHCD plasmas. Nearly steady state H-mode discharges were found during LHCD with two different frequency injections. Sawtooth suppression in NB heated plasmas by LHCD have shown an improvement in confinement near the plasma center. Parametric instabilities in LH heating experiments were significantly reduced by increasing the plasma current, and the stored energy increased linearly with heating power of up to approximately 9 MW at ne approximately 7*1019 m-3 and Ip=2.75 MA. Parametric instabilities near the plasma edge in the ion heating regime were also reduced in peaked density plasmas produced by pellet injection and LH waves increased the central plasma pressure at ne(0) > 1.4*1020 m-3.
- Published
- 1990
- Full Text
- View/download PDF
7. Effect Of Grain Size-Distribution And Nonthermal Ion Distribution On Dust Acoustic Solitons
- Author
-
K. Annou and R. Annou
- Subjects
Physics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Plasma ,Acoustic wave ,Grain size ,Ion ,symbols.namesake ,Mach number ,Physics::Plasma Physics ,Particle-size distribution ,symbols ,Astrophysics::Solar and Stellar Astrophysics ,Lagrangian coherent structures ,Ion distribution ,Astrophysics::Earth and Planetary Astrophysics ,Atomic physics - Abstract
The investigation of the formation of non‐linear coherent structures in dusty plasmas taking into account the dust size and non‐thermal ion distributions is conducted. Conditions of the existence of solitons in terms of the Mach number, concentration of non‐thermal ions, dust charge and the permeability of the grains are evaluated.
- Published
- 2005
- Full Text
- View/download PDF
Catalog
Books, media, physical & digital resources
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.