940 Matching Results

Search Results

Advanced search parameters have been applied.

in subjects: "700205 -- Fusion Power Plant Technology-- Fuel, Heating, & Injection Systems"

open access

Beam injection in the TMX-U central cell

Results pertaining to the recently modified beam-injection arrangement in the central cell of TMX-U are presented here. These modifications followed our observation that beam atoms injected perpendicular to the magnetic axis between the first two magnet-coil gaps give rise to trapped ions with midplane pitch angles lying in the intervals 68/sup 0/ < theta < 78/sup 0/ and 59/sup 0/ < theta < 65/sup 0/. These pitch-angle intervals are similar in value to the earlier arrangement of beams injected … more

Date: June 15, 1984

Creator: Turner, W.C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Neutral beam source commercialization study. Final report

The basic tasks of this Phase II project were to: generate a set of design drawings suitable for quantity production of sources of this design; fabricate a functional neutral beam source incorporating as many of the proposed design changes as proved feasible; and document the procedures and findings developed during the contract. These tasks have been accomplished and represent a demonstrated milestone in the industrialization of this complete device.

Date: June 1, 1980

Creator: King, H. J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

New concept for a high-power beam dump

A new concept for a dump for the ion and neutral beams used in the controlled nuclear fusion program uses thin sheets of a refractory metal such as tungsten formed into troughs having semi-circular cross sections. High-velocity water flowing circumferentially removes heat by subcooled nucleate boiling. Possible advantages are modular construction, lower water-pumping power, and a lower pressure drop than in conventional beam dumps. An example design calculation is shown for a dump capable of ab… more

Date: April 16, 1980

Creator: Moir, R.W. & Taylor, C.E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Transport of low energy positive and negative ion beam by permanent magnets

An experimental investigation of low-energy ion beam guiding by a surface magnetic field generated by samarium cobalt magnets has been performed. It was found that magnets arranged in a multi-ring cusp configuration produced the best beam transport efficiency, in agreement with calculation of the charged particle trajectories for this particular magnet arrangement. This geometry is predicted to yield no distortion in the phase space of the beam. The effect is proportional to charge squared, and… more

Date: October 1, 1980

Creator: Leung, K. N.; Ehlers, K. W. & Hooper, E. B. Jr.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Design, fabrication and operation of the mechanical systems for the Neutral Beam Engineering Test Facility

The Neutral Beam Engineering Test Facility (NBETF) at Lawrence Berkeley Laboratory (LBL) is a National Test Facility used to develop long pulse Neutral Beam Sources. The Facility will test sources up to 120 keV, 50 A, with 30 s beam-on times with a 10% duty factor. For this application, an actively cooled beam dump is required and one has been constructed capable of dissipating a wide range of power density profiles. The flexibility of the design is achieved by utilizing a standard modular pane… more

Date: December 1, 1983

Creator: Paterson, J.A.; Biagi, L.A.; Fong, M.; Koehler, G.W.; Low, W.; Purgalis, P. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Evaluation of beam-line components for use in a large neutral-beam injector

A conceptual model of a neutral-beam injector was used to examine the effect of beam-line components on reactor performance. Criteria were established to optimize a reactor's reliability and minimize its cost.

Date: August 31, 1977

Creator: Fink, J. H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Concerning super-high gain pellets for laser fusion

Recently Afanas'ev et al. claimed 1000 fold energy gains for a new class of pellets, which require only relatively very modest peak laser powers to implode and ignite. An extensive examination of these fuels was made using the LASNEX code. The results are described. (MOW)

Date: October 23, 1976

Creator: Wilson, B. & Wood, L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Proceedings of the fusion fueling workshop

Separate abstracts were prepared for each of the 30 included papers. (MOW)

Date: March 1, 1978

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Advanced design of positive-ion sources for neutral-beam applications

The APIS ion source is being developed to meet a goal of producing ion beams of less than or equal to 200 keV, 100 A, with 10-30-s pulse lengths. In a continuing effort to advance the state of the art and to produce long pulse ion beams, APIS ion sources with grid dimensions of 10 x 25 cm, 13 x 43 cm, and 16 x 48 cm are being developed. In the past year, the 10- x 25-cm ion source has been operated to produce ion beams in excess of 100 keV for many seconds pulse length. An advanced design conce… more

Date: January 1, 1982

Creator: Marguerat, E. F.; Haselton, H. H.; Menon, M. M.; Schechter, D. E.; Stirling, W. L. & Tsai, C. C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Interaction of impurity ions with a weakly non-Maxwellian simple hydrogenic plasma. [None]

The average acceleration of an ensemble of /open quotes/test particles/close quotes/ in a plasma is called the /open quotes/dynamical friction/close quotes/; the average rate at which their velocity vectors spread out in velocity-space diffusion-rate tensor. These quantities are derived for impurity ions intereacting with a weakly non-Maxwellian simple hydrogenic plasma. The distribution functions for the plasma ions and electrons are written explicitly.

Date: March 1, 1988

Creator: Terry, W.K.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Collisional depolarization in arbitrary magnetic fields

The effect of arbitrary magnetic confinement geometry on the spin polarization of magnetically confined plasmas is investigated. The plasma is assumed to be in equilibrium so that the dominant depolarization mechanism is decorrelation of the spin-precession phase and the gyrophase by collisions.

Date: August 1, 1985

Creator: Cowley, S.C. & Kulsrud, R.M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Development of 120 keV neutral beam injectors

Recent development efforts on 120-keV ion sources for neutral-beam systems for the fusion program have focused on producing pulse-lengths longer than the 0.5-sec originally specified for TFTR and improvement of the atomic-ion fraction of the beam. From heat-load measurements of the accelerator grids we deduce that our edge cooled grids should be capable of operation for pulse lengths of the order of 2 seconds; we have operated our 8- x 10-cm accelerator for 1.5-seconds and have fabricated a wat… more

Date: November 1, 1979

Creator: Berkner, K. H.; Burrell, C. F.; Cooper, W. S.; Ehlers, K. W.; Lietzke, A. F.; Owren, H. M. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Diagnostics for the NBETF actively cooled beamdump

Lawrence Berkeley Laboratory's Neutral Beam Engineering Test Facility is currently testing multi-megawatt beams with pulse durations of up to 30 seconds. For this purpose, an actively cooled beam dump composed of heat-absorbing panels tht dissipate the beam energy via high speed water flow has been installed and tested. The panels are mounted in a complex assembly necessary to accommodate the variety of ion sources to be tested. The beam dump required new diagnostics of two kinds: beam diagnost… more

Date: September 1, 1984

Creator: Theil, E. & Jacobson, V.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Collisional pumping for the production of intense spin-polarized neutral beams: target considerations. Revision

Polarized beams at intensity levels heretofore not considered feasible have recently been proposed for heating and fueling fusion plasmas. Polarized-beam fueling could increase fusion rates by 50% as well as allow control of the directionality of the fusion products. A process which we have recently described, and called collisional pumping, promises to produce beams of polarized ions vastly more intense than producible by current methods.

Date: April 1, 1985

Creator: Stearns, J. W.; Burrell, C. F.; Kaplan, S. N.; Pyle, R. V.; Ruby, L. & Schlachter, A. S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

ORNL positive ion neutral beam program

The neutral beam group at Oak Ridge National Laboratory has constructed neutral beam generators for the ORMAK and PLT devices, is presently constructing neutral beam devices for the ISX and PDX devices, and is contemplating the construction of neutral beam systems for the advanced TNS device. These neutral beam devices stem from the pioneering work on ion sources of G. G. Kelley and O. B. Morgan. We describe the ion sources under development at this Laboratory, the beam optics exhibited by thes… more

Date: January 1, 1978

Creator: Whealton, J. H.; Haselton, H. H. & Barber, G. C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Considerations involved in the design of negative-ion-based neutral beam systems

We consider the requirements and constraints for negative-ion-based neutral beam injection systems, and show how these are reflected in design considerations. We will attempt to develop a set of guidelines for users and developers to use to see how well (in a qualitative sense, at least) a particular neutral beam system fits a particular proposed need.

Date: November 1, 1983

Creator: Cooper, W. S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Pressure limits of negative ion sources based upon gas efficiency and extracted ion-current density

The nature of the electrical discharge has an obvious impact upon the gas efficiency of an ion source and on the current density whch can be drawn from it. However external factors, such as the conductance of the grids and the background pressure along the beamline, also have an effect. Simple approximations based upon these factors show that there is a lower limit to the pressure of an ion source, which can deliver an ion beam of given current density at a specific gas efficiency. Estimates of… more

Date: March 10, 1982

Creator: Fink, J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Development of rf plasma generators for neutral beams

The development of low frequency (1-2 MHz) rf plasma generators for high power neutral beam applications is summarized. Immersed couplers from one to three turns were used. Acceptable plasma profiles, less than or equal to 15% max/min, were obtained in a variety of field-free magnetic bucket and magnetic filter-bucket sources, with 10 x 10 cm or 10 x 40 cm extraction areas. Hydrogen beam properties were measured with a 7 x 10 cm accelerator operated at 80 kV. Atomic fraction and power efficienc… more

Date: October 1, 1984

Creator: Vella, M. C.; Ehlers, K. W.; Kippenhan, D.; Pincosy, P. A.; Pyle, R. V.; DiVergilio, W. F. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Energy dissipation on ion-accelerator grids during high-voltage breakdown

The effects of stored energy in the system capacitance across the accelerator grids during high voltage vacuum breakdown are examined. Measurements were made of the current flow and the energy deposition on the grids during breakdown. It is shown that only a portion (less than or equal to 40 J) of the total stored energy (congruent to 100 J) is actually dissipated on the grids. Most of the energy is released during the formation phase of the vacuum arc and is deposited primarily on the most pos… more

Date: January 1, 1981

Creator: Menon, M.M. & Ponte, N.S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Very-high-level neutral-beam control system

As increasing numbers of neutral beams are added to fusion machines, their operation can consume a significant fraction of a facility's total resources. LBL has developed a very high level control system that allows a neutral beam injector to be treated as a black box with just 2 controls: one to set the beam power and one to set the pulse duration. This 2 knob view allows simple operation and provides a natural base for implementing even higher level controls such as automatic source condition… more

Date: October 1, 1981

Creator: Elischer, V.; Jacobson, V. & Theil, E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Rail gun powered by an integral explosive generator

We propose the use of a rail gun powered by an explosive magnetic flux compression generator built into the rail gun itself in which the rails of the gun are driven together behind the projectile by explosives. The magnetic field established between the rails by an initial current supplied by an external source at the breech of the gun is trapped and compressed by the collapsing rails to accelerate the projectile down the bore of the gun.

Date: January 1, 1979

Creator: Peterson, D. R. & Fowler, C. M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Engineering problems of future neutral beam injectors

Because there is no limit to the energy or power that can be delivered by a neutral-beam injector, its use will be restricted by either its cost, size, or reliability. Studies show that these factors can be improved by the injector design, and several examples, taken from mirror reactor studies, are given.

Date: November 23, 1977

Creator: Fink, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Characteristics of a long-pulse (30-s), high-power (4-MW) ion source for neutral beam injection

A quasi-steady-state ion source has been developed for neutral beam injection applications. It is of the duoPIGatron type designed for delivering 50 A of hydrogen ions at 80 keV for 30-s-long pulses. Ion beams of 40 A at 75 keV were extracted for pulse lengths up to 30 s, maintaining excellent optical quality in the beam for the entire pulse duration. The design features and operational characteristics of the ion source are elaborated.

Date: January 1, 1983

Creator: Menon, M. M.; Barber, G. C.; Combs, S. K.; Dagenhart, W. K.; Gardner, W. L.; Haselton, H. H. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

The Breeding Blanket Interface (BBI) and the Tritium Systems Test Assembly (TSTA)

The Tritium System Test Assembly (TSTA) project at Los Alamos National Laboratory is charged with developing and demonstrating the fusion fuel processing requirement for the magnetic fusion energy program. The key fusion fuel streams are the plasma exhaust and the blanket stream. At present, the technology under development at TSTA includes only the plasma exhaust. The blanket is a logical upgrade to TSTA. This possible upgrade is the subject of an ongoing study among LANL, JAERI, and Argonne N… more

Date: October 1, 1989

Creator: Sze, D. K.; Finn, P. A.; Clemmer, R. G.; Anderson, J. L.; Bartlit, J. R.; Sherman, R. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department