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Volume 66 (1991)
- Issue 6 Pages 581-
- Issue 5 Pages 473-
- Issue 4 Pages 357-
- Issue 3 Pages 224-
- Issue 2 Pages 104-
- Issue 1 Pages 9-
Volume 66, Issue 4
Displaying 1-5 of 5 articles from this issue
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Neutron Activation MeasurementsNoriaki Miyanaga, Masanobu Yamanaka, Tatsuhiko Yamanaka1991 Volume 66 Issue 4 Pages 357-378
Published: October 20, 1991
Released on J-STAGE: October 22, 2010
JOURNAL FREE ACCESSNeutron activation measurements currently used in laser fusion experiments are reviewed. In the recent high density experiments, fast neutrons become important to diagnose the compressed fuel because of their long mean-free-path. This report includes diagnostic techniques concerning the fusion yield measurement and the ρ R measurement which use neutron-induced activation.View full abstractDownload PDF (3034K) -
Kenro Miyamoto1991 Volume 66 Issue 4 Pages 379-383
Published: October 20, 1991
Released on J-STAGE: October 22, 2010
JOURNAL FREE ACCESSSix series of lectures entitled by “Introduction to Confinement of Toroidal Plasmas” will be presented successively. The contents and the authors are followings. Chap. 1; Introduction-Tasks of Toroidal Confinement-by Kenro Miyamoto, Chap. 2; MHD Equilibrium and Formation of Magnetic Surfaces of Toroidal Plasma by Masahiro Wakatani, Chap. 3; Macroscopic and Microscopic Instabilities by Masasi Azumi and Masahiro Wakatani, Chap. 4; Particle Confinement and Collisional Diffusion by Noriyoshi Nakajima, Heiji Samuki, Masao Okamoto and Masami Fujiwara, Chap. 5; Confinement Characteristics I, II by Kimitaka Itoh and Sanae Itoh, Chap. 6; Physics of Burning Plasma by Atsusi Fukuyama and Masahiro Wakatani.View full abstractDownload PDF (510K) -
Masahiro Wakatani1991 Volume 66 Issue 4 Pages 384-404
Published: October 20, 1991
Released on J-STAGE: October 22, 2010
JOURNAL FREE ACCESSMHD equilibrium of toroidal plasmas is discussed for both axisymmetric toroidal plasmas such as tokamak and reversed field pinch, and non-axisymmetric toroidal plasmas such as stellarator, heliotron and torsatron. The contents are; 1) Production of rotational transform, 2) Three-dimensional MHD equilibrium and Grad-Shafranov equation which includes (i) a generalized Grad-Shafranov equation, (ii) Grad-Shafranov equation under stellarator approximation, (iii) FCT equilibrium and currentless equilibrium, and (iv) Solove'v-Shafranov equilibrium equation, 3) Magnetic shear and magnetic well, 4) MHD equilibrium and magnetic islands, and 5) MHD equilibrium and equilibrium data analysis.
It is emphasized that MHD equilibrium of stellarator/heliotron can be studied by generalizing Grad-Shafranov equation for tokamaks. MHD equilibrium of spatial axis stellarator is also discussed based on Solove'v-Shafranov equilibrium equation.View full abstractDownload PDF (1999K) -
Katsunobu Nishihara1991 Volume 66 Issue 4 Pages 405-412
Published: October 20, 1991
Released on J-STAGE: October 22, 2010
JOURNAL FREE ACCESSA fully 3-d Rayleigh-Taylor instability of the pusher-fuel contact surface in a spherically stagnating system is described. Saturation amplitude of the exponential growth and free-fall speed following the saturation are discussed with nonlinear bubble-spike structures in spherical geometry. Nonlinear mode coupling of unstable surface waves and reduction of amplitude due to time varying gravity perturbations are also shown.View full abstractDownload PDF (1223K) -
Shigeru Konoshima, Ronald D. Stambaugh, Hiroshi Matsumoto, Punit Gohil ...1991 Volume 66 Issue 4 Pages 413-433
Published: October 20, 1991
Released on J-STAGE: October 22, 2010
JOURNAL FREE ACCESSQuasi-steady state long pulse H-mode discharges with pulse lengths of 5 to 10 second, corresponding to up to about 100 times the energy confinement time have been obtained in the DIII -D tokamak. The so-called Edge Localized Modes (ELMs) play a key role for the long time sustainment through their regulative effect on plasma density, which builds up during the H-mode due to an enhancement of particle confinement. Although the improvement of energy confinement of the ELMy H-mode discharges is somewhat degraded, some of these discharges display a gradual decrease in the overall impurity level throughout the discharge. This effect is significant since it prevents radiation collapse in present devices and should mitigate fuel dilution in future machines. This paper reviews the status of the DIII-D long pulse H-mode experiments and summarizes understandings of the physics and phenomenology of ELMs including impurity behaviour. A brief introduction to the Advanced Divertor (AD) system is also given. Initial operation of AD allowed DIII-D to demonstrate an increased particle flow to the divertor baffle chamber when electrical bias was applied.View full abstractDownload PDF (2011K)
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