Author: W. M. TangPublisher:
ISBN:
Category : Tokamaks
Languages : en
Pages : 171
Book Description
Microinstability Theory in Tokamaks
Author: W. M. TangMicroinstability Theory in Tokamaks
Author: W. M. TangMicroinstability-based Models for Confinement Properties and Ignition Criteria in Tokamaks
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
This paper reports on results of theoretical studies dealing with: (1) the use of microinstability-based thermal transport models to interpret the anomalous confinement properties observed in key tokamak experiments such as TFTR and (2) the likely consequences of the presence of such instabilities for future ignition devices. Transport code simulations using profile-consistent forms of anomalous thermal diffusivities due to drift-type instabilities have yielded good agreement with the confinement times and temperatures observed in TFTR under a large variety of operating conditions including pellet-fuelling in both ohmic- and neutral-beam-heated discharges. With regard to achieving an optimal ignition margin, the adverse temperature scaling of anomalous losses caused by drift modes leads to the conclusion that it is best to operate at the maximum allowable density while holding the temperature close to the minimum value required for ignition.
Tokamaks
Author: John WessonPublisher: Oxford University Press
ISBN: 0199592233
Category : Science
Languages : en
Pages : 828
Book Description
The tokamak is the principal tool in controlled fusion research. This book acts as an introduction to the subject and a basic reference for theory, definitions, equations, and experimental results. The fourth edition has been completely revised, describing their development of tokamaks to the point of producing significant fusion power.
New Ideas in Tokamak Confinement
Author: Marshall N. RosenbluthPublisher: Springer Science & Business Media
ISBN: 9781563961311
Category : Science
Languages : en
Pages : 514
Book Description
Market: Scientists and students involved in thermonuclear fusion research. Thermonuclear fusion research using the confinement device tokamak represents one of the most prominent science projects in the second half of the 20th century. International Tokamak Community is now committing significant effort and funds to experiments with burning plasma, hot and dense enough to produce significant nuclear fusion reactions. The methods used to enhance tokamak performance have a profound and immediate effect on machine design. This book provides an up-to-date account of research in tokamak fusion and puts forward innovative ideas in confinement physics.
Microinstability-based Model for Anomalous Thermal Confinement in Tokamaks
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
This paper deals with the formulation of microinstability-based thermal transport coefficients (chi/sub j/) for the purpose of modelling anomalous energy confinement properties in tokamak plasmas. Attention is primarily focused on ohmically heated discharges and the associated anomalous electron thermal transport. An appropriate expression for chi/sub e/ is developed which is consistent with reasonable global constraints on the current and electron temperature profiles as well as with the key properties of the kinetic instabilities most likely to be present. Comparisons of confinement scaling trends predicted by this model with the empirical ohmic data base indicate quite favorable agreement. The subject of anomalous ion thermal transport and its implications for high density ohmic discharges and for auxiliary-heated plasmas is also addressed.
The effect of trapped ions and current drive on tokamak microinstabilities
Author: Xue Qiao XuPublisher:
ISBN:
Category : Magnetohydrodynamic instabilities
Languages : en
Pages : 306
Book Description
Energy Research Abstracts
Author: Toroidal Microinstability Studies of High Temperature Tokamaks
Author: G. RewoldtToroidal Microinstability Studies of High Temperature Tokamaks
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Results from comprehensive kinetic microinstability calculations are presented showing the effects of toroidicity on the ion temperature gradient mode and its relationship to the trapped-electron mode in high-temperature tokamak plasmas. The corresponding particle and energy fluxes have also been computed. It is found that, although drift-type microinstabilities persist over a wide range of values of the ion temperature gradient parameter [eta]/sub i/ /equivalent to/ (dlnT/sub i//dr)/(dlnn/sub i//dr), the characteristic features of the dominant mode are those of the /eta//sub i/-type instability when /eta//sub i/> /eta//sub ic/ /approximately/1.2 to 1.4 and of the trapped-electron mode when /eta//sub i/