Author: Publisher:
ISBN:
Category : Electrons
Languages : en
Pages : 81
Book Description
A Global Energy Confinement H-mode Database for ITER
Author: Analysis of the ITER H-mode Confinement Database
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 4
Book Description
In order to predict the global energy confinement time in the next generation of large tokamaks it is essential to have data from machines of different sizes and operating parameter regimes. This data can also be used to construct dimensionless scalings and thereby attempt to differentiate between Bohm and gyro-Bohm based transport models. Previously, at the request of the ITER project, H-mode global confinement data was assembled from six machines ASDEX, DIII-D, JET, JFT-2M, PBX-M, and PDX into a single database. This collaboration has continued with the initial database being expanded by extending the plasma parameter space as well as by improving the precision of some of the relevant calculated plasma parameters. This paper summarizes work that has been performed on the newest version (ITERH. DB2) of the confinement database.
ITER L-Mode Confinement Database
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
This paper describes the content of an L-mode database that has been compiled with data from Alcator C-Mod, ASDEX, DIII, DIII-D, FTU, JET, JFT-2M, JT-60, PBX-M, PDX, T-10, TEXTOR, TFTR, and Tore-Supra. The database consists of a total of 2938 entries, 1881 of which are in the L-phase while 922 are ohmically heated (OH) only. Each entry contains up to 95 descriptive parameters, including global and kinetic information, machine conditioning, and configuration. The paper presents a description of the database and the variables contained therein, and it also presents global and thermal scalings along with predictions for ITER. The L-mode thermal confinement time scaling was determined from a subset of 1312 entries for which the thermal confinement time scaling was provided.
Threshold Power and Energy Confinement for ITER.
Author: Multi-machine Global Confinement and H-mode Threshold Analysis
Author: Joseph Allan SnipesPublisher:
ISBN:
Category :
Languages : en
Pages : 16
Book Description
The ITPA Confinement and H-mode Threshold Databases have been used to analyze energy confinement at high density and the dependencies of the H-mode threshold power on aspect ratio ..., edge safety factor, and plasma effective charge (Zeff). High density data from ASDEX-Upgrade, DIII-D, and JET indicate that with peaked density profiles it is possible to maintain good global energy confinement (H98y2 [approx.] 1) up to and beyond the Greenwald density limit even though the loss power ... does not exceed the H-mode threshold power scaling. The new low aspect ratio MAST data in the threshold database permits initial regressions to be made including the aspect ratio. The inverse aspect ratio dependence of the threshold power cannot be determined with the present dataset due to inconsistencies in the threshold between low inverse aspect ratio devices (ASDEX, PBX-M) and MAST. New scalings for the threshold power have been produced, which yield similar values as previous scalings for the predicted threshold power in ITER. There is an increase in the H-mode threshold at low q95
Scientific and Technical Aerospace Reports
Author: Iter Physics
Author: C Wendell Horton, JrPublisher: World Scientific
ISBN: 9814678686
Category : Science
Languages : en
Pages : 248
Book Description
The promise of a vast and clean source of thermal power drove physics research for over fifty years and has finally come to collimation with the international consortium led by the European Union and Japan, with an agreement from seven countries to build a definitive test of fusion power in ITER. It happened because scientists since the Manhattan project have envisioned controlled nuclear fusion in obtaining energy with no carbon dioxide emissions and no toxic nuclear waste products.This large toroidal magnetic confinement ITER machine is described from confinement process to advanced physics of plasma-wall interactions, where pulses erupt from core plasma blistering the machine walls. Emissions from the walls reduce the core temperature which must remain ten times hotter than the 15 million degree core solar temperature to maintain ITER fusion power. The huge temperature gradient from core to wall that drives intense plasma turbulence is described in detail.Also explained are the methods designed to limit the growth of small magnetic islands, the growth of edge localized plasma plumes and the solid state physics limits of the stainless steel walls of the confinement vessel from the burning plasma. Designs of the wall coatings and the special 'exhaust pipe' for spent hot plasma are provided in two chapters. And the issues associated with high-energy neutrons — about 10 times higher than in fission reactions — and how they are managed in ITER, are detailed.
Nuclear Fusion
Author: Computational Statistics
Author: Yadolah DodgePublisher: Springer Science & Business Media
ISBN: 3662268116
Category : Business & Economics
Languages : en
Pages : 565
Book Description
The Role of the Computer in Statistics David Cox Nuffield College, Oxford OXIINF, U.K. A classification of statistical problems via their computational demands hinges on four components (I) the amount and complexity of the data, (il) the specificity of the objectives of the analysis, (iii) the broad aspects of the approach to analysis, (ill) the conceptual, mathematical and numerical analytic complexity of the methods. Computational requi rements may be limiting in (I) and (ill), either through the need for special programming effort, or because of the difficulties of initial data management or because of the load of detailed analysis. The implications of modern computational developments for statistical work can be illustrated in the context of the study of specific probabilistic models, the development of general statistical theory, the design of investigations and the analysis of empirical data. While simulation is usually likely to be the most sensible way of investigating specific complex stochastic models, computerized algebra has an obvious role in the more analyti cal work. It seems likely that statistics and applied probability have made insufficient use of developments in numerical analysis associated more with classical applied mathematics, in particular in the solution of large systems of ordinary and partial differential equations, integral equations and integra-differential equations and for the ¢raction of "useful" in formation from integral transforms. Increasing emphasis on models incorporating specific subject-matter considerations is one route to bridging the gap between statistical ana.
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