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1,658 Matching Results
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A 2-MeV microwave thermionic gun
A high-gradient, S-band microwave gun with a thermionic cathode is being developed in a collaborative effort by AET, Varian, and SSRL. A prototype design using an upgraded Varian dispenser cathode mounted with thermal isolation directly in the first half-cell of a 1-1/2 cell, side-coupled, standing-wave cavity has been fabricated and is being tested. Optimization of the cavity shape and beam formation was done using SUPERFISH, MASK, and PARMELA. An overview of design details, as well as the status of in-progress beam tests, will be presented. 9 refs., 6 figs.
Date:
August 1, 1989
Creator:
Tanabe, E.; Borland, M.; Green, M. C.; Miller, R. H.; Nelson, L. V.; Weaver, J. N. et al.
Object Type:
Article
System:
The UNT Digital Library
3D thermal stress analysis of WIPP (Waste Isolation Pilot Plant) Room T RH TRU (Remote Handled Transuranic) experiments
A three-dimensional finite element thermal stress analysis of the RH TRU experiments in WIPP Room T has been performed. This analysis aids in the interpretation of the borehole closure results being obtained from the Room T experiments and helps in assessing potential performance impacts in a typical storage room, during the waste retrieval period. Computed results are presented and compared to available in situ data, and a qualitative agreement between measured and computed closures is seen. 9 refs., 10 figs.
Date:
August 1, 1989
Creator:
Argueello, J.G.; Beraun, R. & Molecke, M.A.
Object Type:
Article
System:
The UNT Digital Library
Achieve!, Volume 1, Number 4, August 1989
Periodic newsletter discussing information related to student drop-out rates, relevant legislative issues, and prevention programs. This issue focuses on reports on conferences that occurred in 1989.
Date:
August 1989
Creator:
Texas Research League
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Adiabatic Focuser
Theoretical analysis is made of an intense relativistic electron beam. such as would be available from a linear collider, moving through a plasma of increasing density, but density always less than that of the beam (underdense). In this situation. the plasma electrons are expelled from the beam channel and the electrons are subject to an ever-increasing focusing force provided by the channel ions. Analysis is made on the beam radiation energy loss in the classical, the transition, and the quantum regimes. It is shown that the focuser is insensitive to the beam energy spread due to radiation loss. Furthermore, because of the different scaling behaviors in the nonclassical regimes, the radiation limit on lenses (the Oide limit) can be exceeded. The sensitivity of the system to the optic mismatch and the nonlinearity is also analyzed. Examples are given with SLC-type and TLC-type parameters.
Date:
August 1, 1989
Creator:
Chen, P.; Oide, K.; Sessler, Andrew M. & Yu, S. S.
Object Type:
Article
System:
The UNT Digital Library
An adiabatic focuser
Theoretical analysis is made of an intense relativistic electron beam, such as would be available from a linear collider, moving through a plasma of increasing density, but density always less than that of the beam (underdense). In this situation, the plasma electrons are expelled from the beam channel and the electrons are subject to an ever-increasing focusing force provided by the channel ions. Analysis is made on the beam radiation energy loss in the classical, the transition, and the quantum regimes. It is shown that the focuser is insensitive to the beam energy spread behaviors in the nonclassical regimes, the radiation limit on lenses (the Oide limit) can be exceeded. The sensitivity of the system to the topic mismatch and the nonlinearity is also analyzed. Examples are given with SLC-type and TLC-type parameters. 9 refs., 1 tab.
Date:
August 1, 1989
Creator:
Chen, P.; Oide, K.; Sessler, A. M.; Yu, S. S. (Stanford Linear Accelerator Center, Menlo Park, CA (USA); Lawrence Berkeley Lab., CA (USA) & Lawrence Livermore National Lab., CA (USA))
Object Type:
Article
System:
The UNT Digital Library
Admission Factors Related to Success in Doctoral Programs in Vocational-Technical Education in Texas and Oklahoma
This study identified the admissions criteria for selected doctoral programs in vocational-technical education in Oklahoma and Texas and investigated the relationship of these criteria to success in the doctoral programs. Success in the doctoral programs was identified in terms of cumulative doctoral grade point average. Data were obtained through a questionnaire designed to ©licit both general information concerning admissions criteria for vocational-technical doctoral programs at the selected institutions and to collect specific information on a random sample of twenty doctoral candidates from each of the four selected institutions. Factors considered included birthdates, gender, scores on admissions tests, grade point average in the masters program, the year the latest masters was completed, number of colleges attended, and cumulative doctoral grade point average. A statistical analysis using nine separate one-way analyses of variance determined that four of the nine factors considered proved to be statistically significant at the .05 level or better when correlated with the criterion variable (cumulative doctoral grade point average). Those factors were gender, Graduate Record Examination verbal and composite scores, and masters grade point average. The results of the study basically parallel findings of research concerning admissions criteria and success in graduate programs in other areas. Additional research …
Date:
August 1989
Creator:
Roberts, Ross O'Neal
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Advanced R D for electron and photon beams at Brookhaven National Laboratory
The Brookhaven Accelerator Test Facility consists of a 50-MeV linear accelerator and a laser system capable of generating short (a few picoseconds) laser pulses at both UV (266 nm) and infrared (10 [mu]m) wavelengths. With these systems in place, the ATF has unique capabilities for the study of fundamental interactions between charged-particle beams and intense electromagnetic radiation. The principal research goals of the Accelerator Test Facility (ATF) axe the following. Laser Acceleration Program: We wig study the principles and techniques of particle acceleration at ultra-high frequencies (up to 30 THz) and with very high acceleration gradients (up to 1 GV/m). Production of Coherent Radiation: We wish to develop the next generation of photon sources with features like (a) short pulses (picoseconds or less), (b) coherence, and (c) high peak power. All of these attributes can be provided by free-electron lasers. High-brightness sources: A common denominator for the above programs is the need for electron beams with very small transverse and longitudinal emittances. We will devote a substantial amount of our resources to the production and understanding of electron beams that have these attributes. We will build advanced electron sources such as switched-power devices and rf guns with photocathodes. Important applications …
Date:
August 1, 1989
Creator:
Kirk, H.G.
Object Type:
Article
System:
The UNT Digital Library
Advanced R&D for electron and photon beams at Brookhaven National Laboratory
The Brookhaven Accelerator Test Facility consists of a 50-MeV linear accelerator and a laser system capable of generating short (a few picoseconds) laser pulses at both UV (266 nm) and infrared (10 {mu}m) wavelengths. With these systems in place, the ATF has unique capabilities for the study of fundamental interactions between charged-particle beams and intense electromagnetic radiation. The principal research goals of the Accelerator Test Facility (ATF) axe the following. Laser Acceleration Program: We wig study the principles and techniques of particle acceleration at ultra-high frequencies (up to 30 THz) and with very high acceleration gradients (up to 1 GV/m). Production of Coherent Radiation: We wish to develop the next generation of photon sources with features like (a) short pulses (picoseconds or less), (b) coherence, and (c) high peak power. All of these attributes can be provided by free-electron lasers. High-brightness sources: A common denominator for the above programs is the need for electron beams with very small transverse and longitudinal emittances. We will devote a substantial amount of our resources to the production and understanding of electron beams that have these attributes. We will build advanced electron sources such as switched-power devices and rf guns with photocathodes. Important applications …
Date:
August 1, 1989
Creator:
Kirk, H. G.
Object Type:
Article
System:
The UNT Digital Library
[Advisory board meeting agenda]
An advisory board meeting agenda outline for a meeting dated August 25, 1989.
Date:
August 25, 1989
Creator:
AIDS ARMS Network, Inc.
Object Type:
Text
System:
The UNT Digital Library
The Age, Volume 10, Number 8, August 1989
Monthly publication containing information related to Chambers County, Texas, including current events of the Chambers County Historical Commission, the Wallisville Heritage Park, and the Chambers County historical and genealogical societies; reprinted newspaper articles about county events and citizens; and historical news and records.
Date:
August 1989
Creator:
Wallisville Heritage Park (Organization)
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
The Ahuachapan geothermal field, El Salvador: Reservoir analysis
These are appendices F through I of the Ahuachapan Geothermal Field Reservoir Analysis. The volume contains: well logs, water chemistry plots, gas chemistry plots, temperature plots, and flow plots. (JEF)
Date:
August 1, 1989
Creator:
Aunzo, Z.; Bodvarsson, G.S.; Laky, C.; Lippmann, M.J.; Steingrimsson, B.; Truesdell, A.H. et al.
Object Type:
Report
System:
The UNT Digital Library
The Ahuachapan geothermal field, El Salvador: Reservoir analysis
These are appendices A thru E of the Ahuachapan geothermal field reservoir analysis. The volume contains: mineralogy contours, ionic chlorine and silicon dioxide contours, well summaries, and temperature and pressure effects. (JEF)
Date:
August 1, 1989
Creator:
Aunzo, Z.; Bodvarsson, G.S.; Laky, C.; Lippmann, M.J.; Steingrimsson, B.; Truesdell, A.H. et al.
Object Type:
Report
System:
The UNT Digital Library
The Ahuachapan Geothermal Field, El Salvador: Reservoir Analysis
The Earth Sciences Division of Lawrence Berkeley Laboratory (LBL) is conducting a reservoir evaluation study of the Ahuachapan geothermal field in El Salvador. This work is being performed in cooperation with the Comision Ejecutiva Hidroelectrica del Rio Lempa (CEL) and the Los Alamos National Laboratory (LANL). This report describes the work done during the first year of the study (FY 1988--89), and includes the (1) development of geological and conceptual models of the field, (2) evaluation of the initial thermodynamic and chemical conditions and their changes during exploitation, (3) evaluation of interference test data and the observed reservoir pressure decline, and (4) the development of a natural state model for the field. The geological model of the field indicates that there are seven (7) major and five (5) minor faults that control the fluid movement in the Ahuachapan area. Some of the faults act as a barrier to flow as indicated by large temperature declines towards the north and west. Other faults act as preferential pathways to flow. The Ahuachapan Andesites provide good horizontal permeability to flow and provide most of the fluids to the wells. The underlying Older Agglomerates also contribute to well production, but considerably less than the …
Date:
August 1, 1989
Creator:
Aunzo, Z.; Bodvarsson, G. S.; Laky, C.; Lippmann, M. J.; Steingrimsson, B.; Truesdell, A. H. et al.
Object Type:
Report
System:
The UNT Digital Library
[AIDS ARMS Network by-laws draft]
A by-laws draft by the AIDS ARMS Network, Inc, dated August 24, 1989.
Date:
August 24, 1989
Creator:
AIDS ARMS Network, Inc.
Object Type:
Text
System:
The UNT Digital Library
The Albany News (Albany, Tex.), Vol. 114, No. 8, Ed. 1 Thursday, August 3, 1989
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
August 3, 1989
Creator:
Lucas, Donnie A.
Object Type:
Newspaper
System:
The Portal to Texas History
The Albany News (Albany, Tex.), Vol. 114, No. 9, Ed. 1 Thursday, August 10, 1989
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
August 10, 1989
Creator:
Lucas, Donnie A.
Object Type:
Newspaper
System:
The Portal to Texas History
The Albany News (Albany, Tex.), Vol. 114, No. 10, Ed. 1 Thursday, August 17, 1989
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
August 17, 1989
Creator:
Lucas, Donnie A.
Object Type:
Newspaper
System:
The Portal to Texas History
The Albany News (Albany, Tex.), Vol. 114, No. 11, Ed. 1 Thursday, August 24, 1989
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
August 24, 1989
Creator:
Lucas, Donnie A.
Object Type:
Newspaper
System:
The Portal to Texas History
The Albany News (Albany, Tex.), Vol. 114, No. 12, Ed. 1 Thursday, August 31, 1989
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
August 31, 1989
Creator:
Lucas, Donnie A.
Object Type:
Newspaper
System:
The Portal to Texas History
The Allen American (Allen, Tex.), Vol. 20, No. 62, Ed. 1 Wednesday, August 2, 1989
Semiweekly newspaper from Allen, Texas that includes local, state, and national news along with advertising.
Date:
August 2, 1989
Creator:
Warnken, Mark
Object Type:
Newspaper
System:
The Portal to Texas History
The Allen American (Allen, Tex.), Vol. 20, No. 63, Ed. 1 Sunday, August 6, 1989
Semiweekly newspaper from Allen, Texas that includes local, state, and national news along with advertising.
Date:
August 6, 1989
Creator:
Warnken, Mark
Object Type:
Newspaper
System:
The Portal to Texas History
The Allen American (Allen, Tex.), Vol. 20, No. 64, Ed. 1 Wednesday, August 9, 1989
Semiweekly newspaper from Allen, Texas that includes local, state, and national news along with advertising.
Date:
August 9, 1989
Creator:
Warnken, Mark
Object Type:
Newspaper
System:
The Portal to Texas History
The Allen American (Allen, Tex.), Vol. 20, No. 65, Ed. 1 Sunday, August 13, 1989
Semiweekly newspaper from Allen, Texas that includes local, state, and national news along with advertising.
Date:
August 13, 1989
Creator:
Warnken, Mark
Object Type:
Newspaper
System:
The Portal to Texas History
The Allen American (Allen, Tex.), Vol. 20, No. 66, Ed. 1 Wednesday, August 16, 1989
Semiweekly newspaper from Allen, Texas that includes local, state, and national news along with advertising.
Date:
August 16, 1989
Creator:
Warnken, Mark
Object Type:
Newspaper
System:
The Portal to Texas History