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Volume 58, Issue 2
Displaying 1-8 of 8 articles from this issue
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Ken Yoshioka1987 Volume 58 Issue 2 Pages 87-104
Published: August 20, 1987
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSRecent progresses in theories and experiments on the suppression of resistive MHD instabilities in tokamaks using RF waves are reviewed. Topics are focussed on (i) the m=2 tearing mode stabilization with lower hybrid current drive as well as electron cyclotron resonance heating for the prevension of major disruptions and (ii) the sawtooth mode stabilization using lower hybrid waves. New quasilinear theories on the magnetic island behavior under the presence of RF waves are also discussed.View full abstractDownload PDF (1591K) -
Masao Okamoto, Masafumi Azumi, Masayuki Nagami, Norio Suzuki, Hiroshi ...1987 Volume 58 Issue 2 Pages 105-127
Published: August 20, 1987
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSSince the H-mode was discovered in ASDEX tokamak in 1982, experimental efforts have been made in order to explore the characteristics and properties of the “good confinement”. Many theoretical works have also been done to interpret the H-mode. In the present review, experiments and theories on the H-mode are surveyed.View full abstractDownload PDF (2420K) -
Kazuo A. Tanaka1987 Volume 58 Issue 2 Pages 128-142
Published: August 20, 1987
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSWhen a very short (≈10-9 sec) laser pulse propagates in a plasma with its scalelength of-100 μm, interactions of this laser pulse with the plasma result in laser light absorption and x-ray emissions and cause various kinds of nonlinear parameteric instabilities in the corona region. Reviewed are the basic properties of these interactions which occur in hot (electron temperature : Te>0.5 keV) and dense (electron density : ne_??_1020/cm3) laser-produced plasmas.View full abstractDownload PDF (1319K) -
Kunioki Mima1987 Volume 58 Issue 2 Pages 143-153
Published: August 20, 1987
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSIn laser fusion, driven energy is deposited in the critical region which is far away from the ablation surface and imploding solid density layer. Therefore, the energy transport is one of the critical issues for the coupling of laser energy with hydrodynamic motion. This lecture overviews the electron thermal transport, X-ray radiation transport, ablation structure and so on.View full abstractDownload PDF (860K) -
Takashi Fujimoto, Atsumu Hirabayashi1987 Volume 58 Issue 2 Pages 154-158
Published: August 20, 1987
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSThe laser-induced-fluorescence spectroscopy (LIFS) has been applied to a pulsed discharge plasma (2 torr of 95% helium and 5% neon mixture gas), and we have observed disalignment of the neon 2p2-level atoms due to electron and ion collisions under the condition of ne=5.1×1013 cm-3 and Te=2.0×103 K. The effect of ion collisions is estimated in the approximation of the static ion microfield. This field causes effective disalignment, and its rate is calculated. The disalignment rate coefficient due to electron collisions is deduced to be (5.3±1.3) ×10-7 cm3s-1. This rate coefficient is found to be consistent with the Stark width as calculated by Griem.View full abstractDownload PDF (393K) -
Tadayoshi Ono, Takaichi Kawamura, Akira Miyahara1987 Volume 58 Issue 2 Pages 159-174
Published: August 20, 1987
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSOf important atomic processes taking place in tokamak plasmas, rate coefficient formulas available for ionization and recombination are briefly reviewed and those for oxygen and iron ions are studied by comparison. As an example, assessment of rate coefficient formulas for an impurity transport modelling based on a one-dimensional tokamak model is made, and the remarkable dependence of the radial impurity distributions on the difference between two dielectronic recombination rate coefficient formulas is shown. This result suggests that considerably accurate atomic data would be necessary to derive reliable values of anomalous impurity transport coefficients from plasma modelling research.View full abstractDownload PDF (1571K) -
Shigeo Nagao1987 Volume 58 Issue 2 Pages 175-180
Published: August 20, 1987
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSIt was shown that a signgificant amount.of dipole current is necessary to be driven for the plasma equilibrium of a toroidal configuration in general. Through the vector product with the poloidal field, this dipole current force has to balance with the hoop force of plasma pressure itself of the annular shape.View full abstractDownload PDF (488K) -
Shigeo Nagao1987 Volume 58 Issue 2 Pages 181-187
Published: August 20, 1987
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSIt is examined whether the phenomena of sawtooth suppression in a tokamak can be explained by the term of dipole current mode equilibrium, where hoop force of plasma pressure is balanced with a vector product force between the dipole current in the plasma column and the poloidal field by the main OH current.View full abstractDownload PDF (524K)
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