ANALYSIS OF COMBINED FWCD AND NBI IN THE DIII-D TOKAMAK.

ANALYSIS OF COMBINED FWCD AND NBI IN THE DIII-D TOKAMAK.
Author:
Publisher:
Total Pages: 26
Release: 2001
Genre:
ISBN:

In recent experiments with combined fast wave current drive (FWCD) and deuterium neutral beam injection on the DIII-D tokamak [Luxon and Davis, Fusion Technol. 8, 441 (1985)], an enhanced fusion reactivity and fast ion energy content have been observed in the presence of FWCD, with a concomitant low FWCD efficiency [Petty et al., Radio Frequency Power in Plasmas (AIP, New York, 1997), p. 225]. In this paper, we investigate whether high-harmonic ion cyclotron damping could be responsible for the low FWCD efficiency in these experiments, since a number of high-harmonic hydrogen and deuterium cyclotron resonance layers existed in the plasma. The main analysis tool is the ICRF code PION [Eriksson, Hellsten and Willen, Nucl. Fusion 33, 1037 (1993)], modified to allow multiple frequencies simultaneously as was done in the DIII-D experiments. According to the PION modeling, high harmonic damping of fast wave power can give rise to enhanced fusion reactivity and fast ion energy content, which is consistent with the experimental observations.

Simulation of Enhanced Tokamak Performance on DIII-D Using Fast Wave Current Drive

Simulation of Enhanced Tokamak Performance on DIII-D Using Fast Wave Current Drive
Author:
Publisher:
Total Pages: 4
Release: 1993
Genre:
ISBN:

The fast magnetosonic wave is now recognized to be a leading candidate for noninductive for the tokamak reactor due to the ability of the wave to penetrate to the hot dense core region. Fast wave current drive (FWCD) experiments on D3D have realized up to 120 kA of rf current drive, with up to 40% of the plasma current driven noninductively. The success of these experiments at 60 MHZ with a 2 MW transmitter source capability has led to a major upgrade of the FWCD system. Two additional transmitters, 30 to 120 NM, with a 2 MW source capability each, will be added together with two new four-strap antennas in early 1994. Another major thrust of the D3-D program is to develop advanced tokamak modes of operation, simultaneously demonstrating improvements in confinement and stability in quasi-steady-state operation. In some of the initial advanced tokamak experiments on D3-D with neutral beam heated (NBI) discharges it has been demonstrated that energy confinement nine can be improved by rapidly elongating the plasma to force the current density profile to be more centrally peaked. However, this high-l[sub i] phase of the discharge with the commensurate improvement in confinement is transient as the current density profile relaxes. By applying FWCD to the core of such a [kappa]-ramped discharge it may be possible to sustain the high internal inductance and elevated confinement. Using computational tools validated on the initial DM-D FWCD experiments we find that such a high-l[sub i] advanced tokamak discharge should be capable of sustainment at the 1 MA level with the upgraded capability of the FWCD system.

Radio Frequency Power in Plasmas

Radio Frequency Power in Plasmas
Author: Ryan
Publisher: American Institute of Physics
Total Pages: 526
Release: 1998-04-15
Genre: Science
ISBN: 9781563967092

This topical conference addresses the use of radio frequency fields for plasma heating, current drive, and MHD control in plasmas. The launching, propagation, mode conversion, and absorption of radio frequency energy in various frequency ranges (Alfven to electron cyclotron) are treated in relation to heating, confinement, plasma production, plasma properties, and current generation. Topics also include basic rf wave physics, rf plasma sources for material processing, and rf technology issues.

Tokamaks

Tokamaks
Author: John Wesson
Publisher: Oxford University Press
Total Pages: 828
Release: 2011-10-13
Genre: Science
ISBN: 0199592233

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.

Fusion Technology 1990

Fusion Technology 1990
Author: B.E. Keen
Publisher: Elsevier
Total Pages: 1039
Release: 2012-12-02
Genre: Technology & Engineering
ISBN: 0444600655

The aim of the biennial series of symposia on Fusion Technology, organized by the European Fusion Laboratories, is the exchange of information on the design, construction and operation of fusion experiments. The coverage of the volume includes the technology aspects of fusion reactors to provide a link to the technology of new developments and form a guideline for the definition of future work. These proceedings comprise two volumes and contain both the invited lectures and contributed papers presented at the Symposium, which was attended by 556 participants from around the globe. The 312 papers in this volume, including 17 invited papers, give a broad and current overview of the progress and trends fusion technology is experiencing now, and the future for fusion devices.

Index to IEEE Publications

Index to IEEE Publications
Author: Institute of Electrical and Electronics Engineers
Publisher:
Total Pages: 1316
Release: 1996
Genre: Electric engineering
ISBN:

Issues for 1973- cover the entire IEEE technical literature.