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Volume 64 (1990)
- Issue 6 Pages 461-
- Issue 5 Pages 397-
- Issue 4 Pages 335-
- Issue 3 Pages 255-
- Issue 2 Pages 144-
- Issue 1 Pages 5-
Volume 64, Issue 2
Displaying 1-5 of 5 articles from this issue
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Michiya Shimada1990 Volume 64 Issue 2 Pages 144-166
Published: August 20, 1990
Released on J-STAGE: October 22, 2010
JOURNAL FREE ACCESSPresent status of impurity transport study in tokamaks is reviewed. Ohmically-heated and neutral-beam heated L-mode discharges exhibit anomalous impurity transport. The values of particle diffusivity range from 0.5 to 2m2/s. With improved energy confinement such as in H-mode, impurity transport is suppressed, which results in a radiation collapse of H-mode state in the absence of edge-localized mode (ELM). With high power neutral beam heating, frequent ELMs expel particles and heat out of the separatrix surface, which results in long (-5seconds), quasi-stationary H-mode.View full abstractDownload PDF (2989K) -
Nobuaki Noda1990 Volume 64 Issue 2 Pages 167-183
Published: August 20, 1990
Released on J-STAGE: October 22, 2010
JOURNAL FREE ACCESSWall conditioning of fusion experimental devices is reviewed. Various techniques, such as discharge cleaning, gettering, carbonization, bolonization are introduced. Impacts of these techniques on main plasmas are discussed and summarized.View full abstractDownload PDF (2436K) -
Shinzaburo Matsuda, Kiyoshi Shibanuma1990 Volume 64 Issue 2 Pages 184-194
Published: August 20, 1990
Released on J-STAGE: October 22, 2010
JOURNAL FREE ACCESSA time has come for fusion experimental reactor programs (ITER/FER) to enter the engineering design phase, where the large scale models, which are capable of extrapolation to construction of the reactor, will be developed as the cores of main activities. A brief review of the present status of the required R & D for experimental reactors, and their perspectives of technological realization are given.View full abstractDownload PDF (1433K) -
Hirokazu Tahara, Takahisa Sakakibara, Yoichi Kagaya, Takao Yoshikawa1990 Volume 64 Issue 2 Pages 195-211
Published: August 20, 1990
Released on J-STAGE: October 22, 2010
JOURNAL FREE ACCESSExperimental researches on the operational performance and the arc structure of a quasisteady magnetoplasmadynamic (MPD) arcjet was made to develop a high-performanceaccelerator in space. The results showed that the current pattern, which depended strongly on gas species and discharge current levels, influenced the thruster performance. It was found that the plasma produced in the discharge chamber was compressed radially and that 50% on the input power was consumed in the cathode region. From the plasma potential distribution, a positive voltage slope and mass starvation were found to be present near the anode surface beyond the predicted critical current level.View full abstractDownload PDF (2304K) -
Makoto Katsurai1990 Volume 64 Issue 2 Pages 212-224
Published: August 20, 1990
Released on J-STAGE: October 22, 2010
JOURNAL FREE ACCESSApproximate analysis of the flux-core-spheromak (FCS) in a force-free state is presented on the basis of a simplified model for its structure. In the model, the magnetic structure of FCS is devided into three parts, namely, the center core part, the spheromak part, and the coupling part between the externally applied vertical-field and the toroidal current in the spheromak part. In our model, the eigenvalue k which characterizes a force-free state is defined by the ratio of the spatially averaged value of the current to that of the magnetic field in each part. The force-free condition is at first applied separately in each part and then the obtained relations are coupled to determine the eigen-value k of the system for a given aspect ratio A of the spheromak part. The results are compared to those of rigorous analytical solutions, and it is found that the results in our simplified model have qualitatively the similar trends to those of the analytical solutions in terms of various parametric dependences which characterize the FCS structure.View full abstractDownload PDF (1137K)
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