2,606 Matching Results

Search Results

Advanced search parameters have been applied.


Description: The status and near-term goals of the LBL/LLL neutral-beam-development program are described. The emphasis in this paper is on the technology of systems based on the acceleration and neutralization of positive ions; this approach will be used in the near term, probably through 1985 at least. For more efficient injection, part of our plan is to develop a negative-ion approach suitable for 200- to 400-kV injectors on confinement experiments in the 1985-90 period. However, the negative-ion based program is still very much in the research phase, and it is difficult to project how it will phase into fusion reactor fueling experiments.
Date: November 1, 1977
Creator: Berkner, K.H.; Berkner, K.H.; Ehlers, K.W.; Pyle, R.V. & Hooper Jr., E.B.
Partner: UNT Libraries Government Documents Department

Response to Questions on Presentation to NAS

Description: Response to questions on the presentation 'Overview to Chamber and Power Plant Designs for IFE' made at the 1/29-31 meeting of the National Academies Committee on the Prospects for Inertial Confinement Fusion Energy Systems.
Date: March 17, 2011
Creator: Meier, W. R.
Partner: UNT Libraries Government Documents Department

Modeling electron heat transport during magnetic field buildup in SSPX

Description: A model for spheromak magnetic field buildup and electron thermal transport, including a thermal diffusivity associated with magnetic turbulence during helicity injection is applied to a SSPX equilibrium, with a maximum final magnetic field of 1.3 T. Magnetic field-buildup times of 1.0 X 10-3, 5.0 X 10-4 and 1.0 X 10-4 s were used in the model to examine their effects on electron thermal transport. It is found that at transport run time of 4 x 10-3 s, the fastest buildup-time results in the highest final temperature profile, with a core temperature of 0.93 kev while requiring the lowest input energy at 140 KJ. The results show that within the model the most rapid buildup rate generates the highest electron temperature at the fastest rate and at the lowest consumption of energy. However, the peak power requirements are large (> 600 MW for the fastest buildup case examined).
Date: October 1, 1997
Creator: Hua, D.D.; Hooper, E.B. & Fowler, T.K.
Partner: UNT Libraries Government Documents Department

Two-fluid analysis of dimensionally similar discharges

Description: The concept of dimensionless scaling introduces the possibility of determining the required size for a fusion reactor based on data from a single machine. Specifically, all dimensionless quantities other than the normalized gyroradius {rho}* can be simultaneously matched to reactor values in present-day tokamaks. Experiments on DIII-D show that the electrons and ions have distinct {rho}* scalings--for electrons {chi} {proportional_to} {rho}*, while {chi} {proportional_to} {rho}*{sup {minus}1/2} for ions. This observation can unify previous results based on single-fluid analysis, and, in addition, illustrates the danger of using such analysis to extrapolate to a reactor. The {rho}* scaling, coupled with technological limits on the magnetic field strength, determines the minimum size for a reactor. If these {rho}* scalings found on DIII-D hold under reactor-relevant conditions, the confinement will scale unfavorably as {rho}* is reduced to the values expected in a reactor.
Date: December 1, 1994
Creator: Luce, T.C. & Petty, C.C.
Partner: UNT Libraries Government Documents Department

DOE Handbook: Supplementary guidance and design experience for the fusion safety standards DOE-STD-6002-96 and DOE-STD-6003-96

Description: Two standards have been developed that pertain to the safety of fusion facilities. These are DOE- STD-6002-96, Safety of Magnetic Fusion Facilities: Requirements, and DOE-STD-6003-96, Safety of Magnetic Fusion Facilities: Guidance. The first of these standards identifies requirements that subscribers to that standard must meet to achieve safety in fusion facilities. The second standard contains guidance to assist in meeting the requirements identified inthefirst This handbook provides additional documentation on good operations and design practices as well as lessons learned from the experiences of designers and operators of previous fusion facilities and related systems. It is intended to capture the experience gained in the various fields and pass it on to designers of future fusion facilities as a means of enhancing success and safeiy. The sections of this document are presented according to the physical location of the major systems of a t%sion facility, beginning with the vacuum vessel and proceeding to those systems and components outside the vacuum vessel (the "Ex-vessel Systems"). The last section describes administrative procedures that cannot be localized to specific components. It has been tacitly assumed that the general structure of the fusion facilities addressed is that of a tokamak though the same principles would apply to other magnetic confinement options.
Date: January 1, 1999
Partner: UNT Libraries Government Documents Department

Z-Pinch Fusion for Energy Applications

Description: Z pinches, the oldest fusion concept, have recently been revisited in light of significant advances in the fields of plasma physics and pulsed power engineering. The possibility exists for z-pinch fusion to play a role in commercial energy applications. We report on work to develop z-pinch fusion concepts, the result of an extensive literature search, and the output for a congressionally-mandated workshop on fusion energy held in Snowmass, Co July 11-23,1999.
Date: January 1, 2000
Partner: UNT Libraries Government Documents Department

Visualization of Magnetically Confined Plasmas

Description: With the rapid developments in experimental and theoretical fusion energy research towards more geometric details, visualization plays an increasingly important role. In this paper we will give an overview of how visualization can be used to compare and contrast some different configurations for future fusion reactors. Specifically we will focus on the stellarator and tokamak concepts. In order to gain understanding of the underlying fundamental differences and similarities these two competing concepts are compared and contrasted by visualizing some key attributes.
Date: December 10, 1999
Creator: Lewandowski, J.L.V.
Partner: UNT Libraries Government Documents Department