Author: C. E. SingerPublisher:
ISBN:
Category :
Languages : en
Pages : 7
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.
Fusion Energy Update
Author: Current Profile Evolution During Fast Wave Current Drive on the DIII-D Tokamak
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 4
Book Description
The effect of co and counter fast wave current drive (FWCD) on the plasma current profile has been measured for neutral beam heated plasmas with reversed magnetic shear on the DIII-D tokamak. Although the response of the loop voltage profile was consistent with the application of co and counter FWCD, little difference was observed between the current profiles for the opposite directions of FWCD. The evolution of the current profile was successfully modeled using the ONETWO transport code. The simulation showed that the small difference between the current profiles for co and counter FWCD was mainly due to an offsetting change in the o@c current proffie. In addition, the time scale for the loop voltage to reach equilibrium (i.e., flatten) was found to be much longer than the FWCD pulse, which limited the ability of the current profile to fully respond to co or counter FWCD.
Energy Research Abstracts
Author: Heating in Toroidal Plasmas
Author: T. ConsoliPublisher: Elsevier
ISBN: 1483182088
Category : Science
Languages : en
Pages : 255
Book Description
Heating in Toroidal Plasmas, Volume 1 documents the proceedings of the symposium held at the Centre d'Etudes Nucléaires, Grenoble, France, on July 3-7, 1978. This volume compiles 52 articles that are thematically grouped in this publication. The first two sets of papers focus on the general theory and topics on neutral beam injection. The subsequent group of papers studies heating at ion cyclotron- and lower frequencies. A bulk of papers compiled in this volume examines lower hybrid resonance heating. The remaining set of papers is devoted to electron cyclotron heating. This volume will be invaluable to physics students and others interested in studying plasma, specifically the method of heating in toroidal plasmas.
Author: 
Author: 
Author: Carl Göran Schultz
Author: