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406 Matching Results

Start Over Access Open Access Year 1983 Day 5th Language English

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Results: 1 - 24 of 406 next

(open access)

Computation of self-consistent 2-D MHD with neutral-beam and bootstrap currents in elongated plasmas

The observation of substantial current drive from neutral beam injection (NBI) in TFTR, JET and DIII-D has led to renewed interest in a steady state, non-inductively driven tokamak. The discovery of apparently considerable neoclassical (bootstrap) current in TFTR, makes a steady state device even more attractive since the bootstrap portion of the current could be obtained without additional power input. Motivated by these results, we have developed a code, ACCOME, which self-consistently computes the 2-D MHD equilibrium with the current driven by neutral beams, bootstrap and the electric field. In this paper we first describe some details of the code in the next section and in the subsequent section show some applications to DIII-D and to a possible ITER design.

Date: April 5, 1983

Creator: Devoto, R. S.; Tani, K. & Azumi, M.

Object Type: Article

System: The UNT Digital Library

(open access)

Formation of H/sup -/ by charge transfer in alkaline-earth vapors

Progress since the last symposium on the study of H/sup -/ formation by charge transfer in alkaline-earth vapors is reported. High yields are obtained at low energies, in agreement with theoretical predictions.

Date: December 5, 1983

Creator: Schlachter, A.S. & Morgan, T.J.

Object Type: Article

System: The UNT Digital Library

(open access)

Initial TMX-U thermal-barrier experiments

This paper describes results from the initial thermal barrier experiments in the Tandem Mirror Experiment-Upgrade (TMX-U). Strong end plugging has been produced using a combination of ECRH gyrotrons with sloshing ion beam injection. Plugging has been achieved with a central cell higher than that of the end plugs. In these low-density central cell experiments (7 x 10/sup 11/ cm/sup -3/) the axial losses (tau/sub parallel to/ = 20 to 80 ms) are smaller than the radial losses (tau/sub perpendicular to/ = 4 to 8 ms). Although no direct measurements are yet available to determine if a thermal barrier potential dip is generated, these experiments support many theoretical features of the thermal barrier concept.

Date: October 5, 1983

Creator: Simonen, T. C.; Allen, S. L.; Berzins, L.; Carter, M.; Casper, T. A.; Clauser, J. F. et al.

Object Type: Report

System: The UNT Digital Library

captions transcript

[News Clip: Older Mothers (pt2)]

Video footage from the WBAP-TV station in Fort Worth, Texas, to accompany a news story by reporter Christi Meyers of KPRC Houston about attitudes toward delayed parenthood and mothers having babies after age 35. The story focuses on the birth of Gregory to 39-year-old mother Sherman and 46-year-old father Dudley Sumner. The story includes footage of the parents and physicians in the delivery room and interviews with the Sumner's physician as well as obstetrician Linda Cecil about the safety of having children after age 35.

Date: July 5, 1983

Creator: KXAS-TV (Television station : Fort Worth, Tex.)

Object Type: Video

System: The UNT Digital Library

(open access)

Fusion-breeder-reactor design studies

Studies of the technical and economic feasibility of producing fissile fuel in tandem mirrors and in tokamaks for use in fission reactors are presented. Fission-suppressed fusion breeders promise unusually good safety features and can provide make-up fuel for 11 to 18 LWRs of equal nuclear power depending on the fuel cycle. The increased revenues from sales of both electricity and fissile material might allow the commercial application of fusion technology significantly earlier than would be possible with electricity production from fusion alone. Fast-fission designs might allow a fusion reactor with a smaller fusion power and lower Q value to be economical and thus make this application of fusion even earlier. A demonstration reactor with a fusion power of 400 MW could produce 600 kg of fissile material per year at a capacity factor of 50%. The critical issues, for which small scale experiments are either being carried out or planned, are: (1) material compatibility, (2) beryllium feasibility, (3) MHD effects, and (4) pyrochemical reprocessing.

Date: April 5, 1983

Creator: Moir, R. W.; Lee, J. D. & Coops, M. S.

Object Type: Article

System: The UNT Digital Library

(open access)

Effects of pulsed dual-ion irradiation on phase transformations and microstructure in Ti-modified austenitic alloy

The influence of pulsed 4 MeV Ni ion bombardment, with and without simultaneous helium injection, has been explored in a low swelling, Ti-modified austenitic stainless steel. Irradiations were carried out to 70 dpa at 950/sup 0/K; the pulsing frequencies were either 60 s on/off or 1 s on/off. Compared to continuous irradiation, pulsing caused a decrease in the interstitial loop diameter at 1 dpa, although at higher doses the overall dislocation density was not affected. Pulsing and helium both promoted the stability of MC precipitates and retarded the subsequent G phase formation; in some cases G-phase was suppressed and eta phase formed instead. Small bubble-like cavities were observed to grow into large voids after steady dual beam irradiation to 70 dpa. However, this conversion was suppressed by pulse irradiation to 70 dpa and furthermore the sizes of the small cavities were somewhat reduced. The results are explained in terms of current mechanistic understanding of mean point defect kinetics and the evolution of microstructure and microcomposition during irradiation with superimposed annealing periods.

Date: January 5, 1983

Creator: Lee, E. H.; Packan, N. H. & Mansur, L. K.

Object Type: Article

System: The UNT Digital Library

(open access)

Model of current enhancement at high pressure

A model is proposed to account for the phenomenon of net current enhancement at high pressures recently observed on the Experimental Test Accelerator. The proposed mechanism involves energetic secondary electrons (delta rays) which are pushed forward by the self-magnetic field of the electron beam. For high current beams, the forward delta ray current can build up to a significant fraction of the beam current. Analytic calculations of the steady-state solution as well as the rate of buildup of the delta ray current are presented in this paper. In addition, numerical results from a nonlocal Boltzmann code, NUTS, are presented. The analytic and numerical results have many features which are in qualitative agreement with the experiments, but quantitative discrepancies still exist.

Date: April 5, 1983

Creator: Yu, S. S. & Melendez, R. E.

Object Type: Report

System: The UNT Digital Library

(open access)

Measurement of seismic moments at the RSTN station RSSD for NTS explosions

We have estimated the seismic moment for two Nevada Test Site (NTS) explosions (Nebbiolo, 6/24/82; Atrisco, 8/5/82) at the Regional Seismic Test Network (RSTN) station in South Dakota (RSSD; distance from NTS approx. 1280 km). The moments are calculated from the vertical component mid-period channel for the Rayleigh waves and the merged mid- and short-period band for the P waves. The moment estimates from surface waves give values of 1.0 x 10/sup 23/ and 2.0 x 10/sup 23/ dyn-cm for Nebbiolo and Atrisco, respectively. The body-wave moments obtained at 0.5 Hz are approximately five times greater than those from surface waves and give values of 4.8 x 10/sup 23/ and 1.0 x 10/sup 24/ dyn-cm for Nebbiolo and Atrisco, respectively. The apparent discrepancy between the body and surface-wave moments can be resolved if there is overshoot (of 5:1) in the explosion source spectrum. As a check on the absolute value of the surface-wave moments, we compared them to moment values predicted from empirical moment-yield relationships for different emplacement media at NTS (Patton, 1983). We found that the agreement between observed and predicted values is satisfactory, within the measurement error on the moments at the one sigma level.

Date: April 5, 1983

Creator: Taylor, S. R. & Patton, H. J.

Object Type: Report

System: The UNT Digital Library

(open access)

Symposium: New Trends in Unconventional Approaches to Magnetic Fusion

An extensive review of the meeting is given. The concepts discussed included reverse-field pinches, compact tori, advanced stellarators, multipoles, surface magnetic confinement systems, the bumpy torus, and a collection of mirror-based approaches. (MOW)

Date: April 5, 1983

Creator: Post, R. F.

Object Type: Article

System: The UNT Digital Library

(open access)

Optical-emission studies in the ion-focused regime

The utility of optical emissions for diagnostic purposes in the ion-focused regime is explored. Two possible uses of the emissions are examined: (1) the time delay of 337.1-nm emissions relative to 391.4-nm emissions is observed to scale with the beam-neutralization time, and (2) emissions at 391.4 nm may determine beam-current density at the front of the beam.

Date: January 5, 1983

Creator: Chong, Y. P.; Yu, S. S.; Masamitsu, J. A.; Fessenden, T. J. & Prono, D. S.

Object Type: Report

System: The UNT Digital Library

(open access)

Magnets for the Mirror Fusion Test Facility: testing of the first Yin-Yang and the design and development of other magnets

Completed in May 1981, the first Yin-Yang magnet for the tandem Mirror Fusion Test Facility (MFTF-B) at Lawrence Livermore National Laboratory (LLNL) was successfully tested in February 1982 to its full design field (7.68 T) and current (5775 A). Since that time, the entire magnet array has been reconfigured - from the original A-cell to an axicell design. The MFTF-B magnet array now contains a total of 26 large superconducting coils: 2 sets of yin-yang pairs, 2 sets of transition magnets (each containing two coils), 2 sets of axicell magnets (each containing three coils), and 12 central-cell solenoids. This paper chronicles recent magnet history - from te testing of the initial yin-yang set, through the design of the axicell configuration, to the planned development of the system.

Date: January 5, 1983

Creator: Kozman, T. A.; Wang, S. T. & Chang, Y.

Object Type: Article

System: The UNT Digital Library

captions transcript

[News Clip: College Station]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

Date: January 5, 1983, 6:00 p.m.

Creator: KXAS-TV (Television station : Fort Worth, Tex.)

Object Type: Video

System: The UNT Digital Library

captions transcript

[News Clip: Reagan]

B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

Date: May 5, 1983, 10:00 p.m.

Creator: KXAS-TV (Television station : Fort Worth, Tex.)

Object Type: Video

System: The UNT Digital Library

captions transcript

[News Clip: Cop kill folo]

B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

Date: May 5, 1983, 5:00 p.m.

Creator: KXAS-TV (Television station : Fort Worth, Tex.)

Object Type: Video

System: The UNT Digital Library

(open access)

The Cherokeean. (Rusk, Tex.), Vol. 134, No. 12, Ed. 1 Thursday, May 5, 1983

Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.

Date: May 5, 1983

Creator: unknown

Object Type: Newspaper

System: The Portal to Texas History

(open access)

Texas Register, Volume 8, Number 48, Pages 2449-2550, July 5, 1983

A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.

Date: July 5, 1983

Creator: Texas. Secretary of State.

Object Type: Journal/Magazine/Newsletter

System: The Portal to Texas History