巻号一覧
後続誌
64 巻 (1990)
- 6 号 p. 461-
- 5 号 p. 397-
- 4 号 p. 335-
- 3 号 p. 255-
- 2 号 p. 144-
- 1 号 p. 5-
64 巻, 4 号
選択された号の論文の5件中1～5を表示しています
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プラズマの「揺り籠 (生成) 」から「墓場 (燃焼後) 」まで俵 博之1990 年 64 巻 4 号 p. 335-337
発行日: 1990/10/20
公開日: 2010/10/22
ジャーナル フリーPDF形式でダウンロード (315K) -
藤本 孝1990 年 64 巻 4 号 p. 338-346
発行日: 1990/10/20
公開日: 2010/10/22
ジャーナル フリーSpectroscopic characteristics of atoms and ions in plasma are conveniently understoodwhen we classify these atoms and ions into the ionizing plasma, recombining plasma andionization-balance plasma, according to their ionization ratios. For each class the population characteristics are reviewed together with the dominant populating and depopulating processesfor excited levels. For some of the low density conditions, the excited-level populations tend tobe very close to the thermal equilibrium values. This fact is contrary to the general expectation. Relationships between the atomic processes responsible to these populations are discussed. Forhigh-density ionizing plasma the population density distribution is established that is inverselyproportional to p-6 where p is the (effective) principal quantum number of the level. Theorigin of this distribution is explained for hydrogenic cases, but is not known for other atomsand ions having more complicated energy-level structures.抄録全体を表示PDF形式でダウンロード (1197K) -
野村 保之, 市川 芳彦, Wendell Horton1990 年 64 巻 4 号 p. 347-361
発行日: 1990/10/20
公開日: 2010/10/22
ジャーナル フリーParticle motions in the relativistic standard map are investigated. In the weaklyrelativistic case, the KAM surface appears at high momentum region and the chaotic motion isrestricted to a finite layer. In the ultra-relativistic case, the chaotic motion disappears and thephase space structure becomes quite regular, consisting of island chains with very high period and KAM surfaces. In order to obtain critical information on these regular motions, symmetryproperties of the map are analyzed. Periodic orbits of the relativistic standard map arediscussed in detail by constructing the families of symmetry curves.抄録全体を表示PDF形式でダウンロード (1791K) -
桂井 誠, 雨宮 尚之, 早川 明一1990 年 64 巻 4 号 p. 362-375
発行日: 1990/10/20
公開日: 2010/10/22
ジャーナル フリーThe magnetic configuration of flux-core spheromaks (FCS) in a finite length cylindricalvessel has been studied by theoretical analyses. The Grad-Shafranov equation for zero-beta Taylor states is analytically solved. For the boundary condition, the presence is assumed ofa certain amount of external fluxes that axially penetrate the vessel through center holes on theend plates of the vessel. The solution is an extension of Turner's solution where the holes areassumed to be infinitesimally small [Phys. Fluids, 27 (1984) 1677]. The solution has been usedto survey the safety-factor (q) profile and the magnetic hill/well profile of the FCS configurationanalyzed. A diagram is presented which shows a classification of FCS configuration in a fluxconservingvessel in terms of the appearace and location of the null (X) points on the separatrix. Unlike conventional spheromak configurations with a magnetic hill and a radially decreasing qprofile, FCS can be provided with a magnetic well or with a radially increasing q profile likeultra-low q toruses (ULQ) and tokamaks. Another diagram called T-P diagram is also presentedwhich can be used, like the F-θ diagram in the reversed field pinch (RFP), to experimentallymonitor the time history of the FCS magnetic configuration in transient phases of production andsustainment periods.抄録全体を表示PDF形式でダウンロード (1334K) -
大宅 薫, 西村 賢治, 森 一郎1990 年 64 巻 4 号 p. 376-385
発行日: 1990/10/20
公開日: 2010/10/22
ジャーナル フリーElastic collision cross sections of electrons with a carbon atom embedded in solid-state arecalculated for energies from the Fermi energy to 1000eV, using the muffin-tin approximation. Special feature of the results is that the mean free path (m. f. p.) of electrons evaluated usingthe new cross section is longer than a half of the nearest-neighbor distance, while the m. f. p. evaluated using conventional collision cross section of electrons with an isolated carbon atomis much smaller. In addition, a Monte Carlo calculation of the dependence on the angle ofincidence of the secondary electron emission from graphite and diamond is carried out. Thecalculated dependence is significantly different from that evaluated with the conventional crosssection and the difference between graphite and diamond is rather small.抄録全体を表示PDF形式でダウンロード (1356K)
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