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Alfven wave stability in D-III-D

Description: Within the framework of the global Alfven eigenmode theory in a cylindrical background plasma, I examine the excitation of global Alfven eigenmodes by intense neutral beam injection in the D III-D tokamak operating at General Atomics. I have considered two separate sets of experimental conditions, a low power'' set of cases using 10MW of hydrogen beams, and a high power'' shot of 20MW of deuterium beams. My results are particularly sensitive to the background density profile. For parabolic back… more
Date: September 1, 1989
Creator: Campbell, R.B. (Lawrence Livermore National Lab., CA (USA)) & Samec, T.K. (TRW, Inc., Redondo Beach, CA (USA))
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Practical aspects of a 2-D edge-plasma model

Description: The poloidal divertor configuration is considered the most promising solution to the particle and energy exhaust problem for a tokamak reactor. The scrape-off layer plasma surrounding the core and the high-recycling plasma near the divertor plates can be modelled by fluid equations for particle, momentum and energy transport. A numerical code (B2) based on a two-dimensional multi-fluid model has been developed for the study of edge plasmas in tokamaks. In this report we identify some key featur… more
Date: July 1, 1989
Creator: Rensink, M. E.; Hill, D. N.; Porter, G. D.; Braams, B. J. (Lawrence Livermore National Lab., CA (USA) & Princeton Univ., NJ (USA). Plasma Physics Lab.)
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Weak turbulence theory of ion temperature gradient modes for inverted density plasmas

Description: Typical profiles measured in H-mode ( high confinement'') discharges from tokamaks such as JET and DIII-D suggest that the ion temperature gradient instability threshold parameter {eta}{sub i} ({equivalent to}dlnT{sub i}/dlnn{sub i}) could be negative in many cases. Previous linear theoretical calculations have established the onset conditions for these negative {eta}{sub i}-modes and the fact that their growth rate is much smaller than their real frequency over a wide range of negative {eta}{s… more
Date: September 1, 1989
Creator: Hahm, T.S. & Tang, W.M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Particle exhaust schemes in the DIII-D advanced divertor configuration

Description: For density control in long-pulse operation, the open divertor on the DIII-D tokamak will be equipped with a baffled chamber and a pumping system. The throat of the baffle chamber is sized to provide optimal pumping for the typical plasma equilibrium configuration. Severe limitations on the toroidal conductance of this baffle chamber require the use of in-vessel pumping to achieve the desired particle exhaust of about 25 Torr{center dot}l/s. Two separate pumping schemes are considered: an array… more
Date: January 1, 1989
Creator: Menon, M.M. & Mioduszewski, P.K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Technology of fast-wave current drive antennas

Description: The design of fast-wave current drive (FWCD) antennas combines the usual antenna considerations (e.g., the plasma/antenna interface, disruptions, high currents and voltages, and thermal loads) with new requirements for spectral shaping and phase control. The internal configuration of the antenna array has a profound effect on the spectrum and the ability to control phasing. This paper elaborates on these considerations, as epitomized by a proof-of-principle (POP) experiment designed for the DII… more
Date: January 1, 1989
Creator: Hoffman, D. J.; Baity, F. W.; Goulding, R. H.; Haste, G. R.; Ryan, P. M.; Taylor, D. J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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