Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
This paper contains viewgraphs on the use of neutral beam current drive in future tokamaks. Current profiles, slowing down distributions, beam destabilization of alfven waves and plasma parameters are some items covered in this paper. (DWL).
Requirements for Neutral Beam Current Drive in Tokamaks
Neutral-beam Current Drive in Tokamaks
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The theory of neutral-beam current drive in tokamaks is reviewed. Experiments are discussed where neutral beams have been used to drive current directly and also indirectly through neoclassical effects. Application of the theory to an experimental test reactor is described. It is shown that neutral beams formed from negative ions accelerated to 500 to 700 keV are needed for this device.
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The theory of neutral-beam current drive in tokamaks is reviewed. Experiments are discussed where neutral beams have been used to drive current directly and also indirectly through neoclassical effects. Application of the theory to an experimental test reactor is described. It is shown that neutral beams formed from negative ions accelerated to 500 to 700 keV are needed for this device.
Power Threshold for Neutral Beam Current Drive
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 14
Book Description
For fully noninductive current drive in tokamaks using neutral beams, there is a power and density threshold condition, setting a minimum value for P32/n2. If this condition is not met, stationary state cannot occur, and a tokamak discharge will collapse. This is a consequence of the coupling between current and electron temperature, or between current drive efficiency and energy confinement time. 4 figs.
Publisher:
ISBN:
Category :
Languages : en
Pages : 14
Book Description
For fully noninductive current drive in tokamaks using neutral beams, there is a power and density threshold condition, setting a minimum value for P32/n2. If this condition is not met, stationary state cannot occur, and a tokamak discharge will collapse. This is a consequence of the coupling between current and electron temperature, or between current drive efficiency and energy confinement time. 4 figs.
Steady-state Current Drive in Tokamaks Workshop Summary
Author: United States. Department of Energy. Division of Magnetic Confinement Systems
Publisher:
ISBN:
Category : Fusion reactors
Languages : en
Pages : 118
Book Description
Publisher:
ISBN:
Category : Fusion reactors
Languages : en
Pages : 118
Book Description
Evolution of Neutral-beam-driven Current in Tokamak Plasmas
Fast Wave Heating and Current Drive in Tokamak Plasmas with Negative Central Shear
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
Book Description
Fast waves provide an excellent tool for heating electrons and driving current in the central region of tokamak plasmas. In this paper, we report the use of centrally peaked electron heating and current drive to study transport in plasmas with negative central shear (NCS). Tokamak plasmas with NCS offer the potential of reduced energy transport and improved MHD stability properties, but will require non-inductive current drive to maintain the required current profiles. Fast waves, combined with neutral beam injection, provide the capability to change the central current density evolution and independently vary {ital T{sub e}}, and {ital T{sub i}} for transport studies in these plasmas. Electron heating also reduces the collisional heat exchange between electrons and ions and reduces the power deposition from neutral beams into electrons, thus improving the certainty in the estimate of the electron heating. The first part of this paper analyzes electron and ion heat transport in the L-mode phase of NCS plasmas as the current profile resistively evolves. The second part of the paper discusses the changes that occur in electron as well as ion energy transport in this phase of improved core confinement associated with NCS.
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
Book Description
Fast waves provide an excellent tool for heating electrons and driving current in the central region of tokamak plasmas. In this paper, we report the use of centrally peaked electron heating and current drive to study transport in plasmas with negative central shear (NCS). Tokamak plasmas with NCS offer the potential of reduced energy transport and improved MHD stability properties, but will require non-inductive current drive to maintain the required current profiles. Fast waves, combined with neutral beam injection, provide the capability to change the central current density evolution and independently vary {ital T{sub e}}, and {ital T{sub i}} for transport studies in these plasmas. Electron heating also reduces the collisional heat exchange between electrons and ions and reduces the power deposition from neutral beams into electrons, thus improving the certainty in the estimate of the electron heating. The first part of this paper analyzes electron and ion heat transport in the L-mode phase of NCS plasmas as the current profile resistively evolves. The second part of the paper discusses the changes that occur in electron as well as ion energy transport in this phase of improved core confinement associated with NCS.
Neutral beam energy and power requirements for the next generation of Tokamaks
Neutral Beam Energy and Power Requirements for the Next Generation of Tokamaks
Neutral Beam Energy and Power Requirements for the Next Generation of Tokamaks
Neutral Beam Heating and Current Drive Systems
Author: D. Stork
Publisher:
ISBN:
Category : Controlled fusion
Languages : en
Pages : 42
Book Description
Publisher:
ISBN:
Category : Controlled fusion
Languages : en
Pages : 42
Book Description