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A 2 to 4 nm high power FEL on the SLAC linac
We report the results of preliminary studies of a 2 to 4 nm SASE FEL, using a photoinjector to produce the electron beam, and the SLAC linac to accelerate it to an energy up to 10 GeV. Longitudinal bunch compression is used to increases ten fold the peak current to 2.5 kA, while reducing the bunch length to the subpicosecond range. The saturated output power is in the multi-gigawatt range, producing about 10{sup 14} coherent photons within a bandwidth of about 0.2% rms, in a pulse of several millijoules. At 120Hz repetition rate the average power is about 1 W. The system is optimized for x-ray microscopy in the water window around 2 to 4 nm, and will permit imaging a biological sample in a single subpicosecond pulse.
Date:
September 1, 1992
Creator:
Pellegrini, C.; Rosenzweig, J.; Nuhn, H. D.; Pianetta, P.; Tatchyn, R.; Winick, H. et al.
Object Type:
Article
System:
The UNT Digital Library
[4 Building 138, (obligue of N & E sides looking SSW)]
Photograph of the 4 Building 138 in Killeen, Texas.
Date:
September 1, 1992
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
[13 Building 4819, (south side west end looking north)]
Photograph of the 13 Building 4819 in Killeen, Texas.
Date:
September 1, 1992
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
14th international symposium on molecular beams
This report discusses research being conducted with molecular beams. The general topic areas are as follows: Clusters I; reaction dynamics; atomic and molecular spectroscopy; clusters II; new techniques; photodissociation & dynamics; and surfaces.
Date:
September 1, 1992
Creator:
unknown
Object Type:
Article
System:
The UNT Digital Library
1991 State-by-state assessment of low-level radioactive wastes received at commercial disposal sites. National Low-Level Waste Management Program
Each year the National Low-Level Waste Management Program publishes a state-by-state assessment report. This report provides both national and state-specific disposal data on low-level radioactive waste commercially disposed of in the United States. Data in this report are categorized according to disposal site, generator category, waste class, volumes, and radionuclide activity. Included in this report are tables showing the distribution of waste by state for 1991 and a comparison of waste volumes and radioactivity by state for 1987 through 1991; also included is a list of all commercial nuclear power reactors in the United States as of December 31, 1991. This report distinguishes between low-level radioactive waste shipped directly for disposal by generators and that which was handled by an intermediary, a reporting change introduced in the 1988 state-by-state report.
Date:
September 1, 1992
Creator:
Fuchs, R. L. & Culbertson-Arendts, K.
Object Type:
Report
System:
The UNT Digital Library
2D-ACAR Spectra of Insulating and Superconducting Y-123
An overview of the two-dimensional angular correlation (2D-ACAR) positron annihilation results for the three fundamental phases of YBa{sub 2}Cu{sub 3}O{sub x}, namely, the normal metal, the superconductor, and the insulator, is presented. In addition to the c-axis projected momentum density, the recent results for the a-axis projection as well as the insulating Y123 are discussed. The experimental results are compared and contrasted with the corresponding band theory predictions as far as possible in order to gain insight into the electronic structure and Fermiology of this archetypal high-{Tc} superconductor.
Date:
September 1, 1992
Creator:
Smedskjaer, L. C. & Bansil, A.
Object Type:
Report
System:
The UNT Digital Library
Abrasive wear by coal-fueled diesel engine and related particles
The development of commercially viable diesel engines that operate directly on pulverized coal-fuels will require solution to the problem of severe abrasive wear. The purpose of the work described in this report was to investigate the nature of the abrasive wear problem. Analytical studies were carried out to determine the characteristics of the coal-fuel and associated combustion particles responsible for abrasion. Laboratory pinon-disk wear tests were conducted on oil-particle mixtures to determine the relationship between wear rate and a number of different particle characteristics, contact parameters, specimen materials properties, and other relevant variables.
Date:
September 1, 1992
Creator:
Ives, L. K. (National Inst. of Standards and Technology, Gaithersburg, MD (United States))
Object Type:
Report
System:
The UNT Digital Library
Abrasive wear by coal-fueled diesel engine and related particles
The development of commercially viable diesel engines that operate directly on pulverized coal-fuels will require solution to the problem of severe abrasive wear. The purpose of the work described in this report was to investigate the nature of the abrasive wear problem. Analytical studies were carried out to determine the characteristics of the coal-fuel and associated combustion particles responsible for abrasion. Laboratory pinon-disk wear tests were conducted on oil-particle mixtures to determine the relationship between wear rate and a number of different particle characteristics, contact parameters, specimen materials properties, and other relevant variables.
Date:
September 1, 1992
Creator:
Ives, L. K.
Object Type:
Report
System:
The UNT Digital Library
Ac loss measurement of SSC dipole magnets
AC losses in full length and 1.5 m model SSC collider dipoles were successfully measured by the direct observation of energy flow into and out of magnets during a ramp cycle. The measurement was performed by using two double-integrating type digital volt meters (DVM's) for current and voltage measurement. Measurements were performed for six is m long ASST magnets and five 1.5 m long model magnets, inducting one 40 mm diameter magnet. There were large variations in the eddy current losses. Since these magnets use conductors with slight deviations in their internal structures and processing of the copper surface depending on the manufacturer, it is likely that there are differences in the contact resistance between strands. Correlation between the ramp rate dependence of the,quench current and the eddy current loss was evident.
Date:
September 1, 1992
Creator:
Delchamps, S.; Hanft, R.; Jaffery, T.; Kinney, W.; Koska, W.; Lamm, M. J. et al.
Object Type:
Article
System:
The UNT Digital Library
AC Loss Measurement of SSC Dipole Magnets
AC losses in full length and 1.5 m model SSC collider dipoles were successfully measured by the direct observation of energy flow into and out of magnets during a ramp cycle. The measurement was performed by using two double-integrating type digital volt meters (DVM`s) for current and voltage measurement. Measurements were performed for six is m long ASST magnets and five 1.5 m long model magnets, inducting one 40 mm diameter magnet. There were large variations in the eddy current losses. Since these magnets use conductors with slight deviations in their internal structures and processing of the copper surface depending on the manufacturer, it is likely that there are differences in the contact resistance between strands. Correlation between the ramp rate dependence of the,quench current and the eddy current loss was evident.
Date:
September 1992
Creator:
Delchamps, S.; Hanft, R.; Jaffery, T.; Kinney, W.; Koska, W.; Lamm, M. J. et al.
Object Type:
Article
System:
The UNT Digital Library
AC loss measurements of model and full size 50mm SSC collider dipole magnets at Fermilab
Tests have recently been performed at Fermilab in order to measure the energy losses due to eddy currents and iron and superconductor magnetization. These measurements were performed on six 1.5m long model magnets and eight 15m long full scale collider dipole magnets. AC losses were measured as a function of ramp rate using sawtooth ramps from 500, to 5000 Amps for both types of magnets, while bipolar studies were additionally performed on some of the short magnets. The measured magnet voltage and current for a complete cycle are digitally integrated to yield the energy loss per cycle. Measurement reproducibility is typically 5%, with good agreement between long magnet measurements and extrapolations from short magnet measurement results. Magnetization loss measurements among similar magnet types agree to within experimental error, while eddy current losses correlate strongly with the observed dependence of quench current on ramp rate.
Date:
September 1, 1992
Creator:
Ozelis, J. P.; Delchamps, S. W.; Gourlay, S.; Jaffery, T.; Kinney, W.; Koska, W. et al.
Object Type:
Article
System:
The UNT Digital Library
AC loss measurements of model and full size 50mm SSC collider dipole magnets at Fermilab
Tests have recently been performed at Fermilab in order to measure the energy losses due to eddy currents and iron and superconductor magnetization. These measurements were performed on six 1.5m long model magnets and eight 15m long full scale collider dipole magnets. AC losses were measured as a function of ramp rate using sawtooth ramps from 500, to 5000 Amps for both types of magnets, while bipolar studies were additionally performed on some of the short magnets. The measured magnet voltage and current for a complete cycle are digitally integrated to yield the energy loss per cycle. Measurement reproducibility is typically 5%, with good agreement between long magnet measurements and extrapolations from short magnet measurement results. Magnetization loss measurements among similar magnet types agree to within experimental error, while eddy current losses correlate strongly with the observed dependence of quench current on ramp rate.
Date:
September 1, 1992
Creator:
Ozelis, J. P.; Delchamps, S. W.; Gourlay, S.; Jaffery, T.; Kinney, W.; Koska, W. et al.
Object Type:
Article
System:
The UNT Digital Library
Accurate plutonium waste measurements using the {sup 252}Cf add-a- source technique for matrix corrections
We have developed a new measurement technique to improve the accuracy and sensitivity of the nondestructive assay (NDA) of plutonium scrap and waste. The 200-{ell} drum assay system uses the classical NDA method of counting passive-neutron coincidences from plutonium but has added the new features of ``add-a-source`` to improve the accuracy for matrix corrections and statistical techniques to improve the low-level detectability limits. The add-a-source technique introduces a small source of {sup 252}Cf (10{sup {minus}8} g) near the external surface of the sample drum. The drum perturbs the rate at which coincident neutrons from the {sup 252}Cf are counted. The perturbation provides the data to correct for the matrix and plutonium inside the drum. The errors introduced from matrix materials in 200-{ell} drums have been reduced by an order of magnitude using the add-a-source technique. In addition, the add-a-source method can detect unexpected neutron-shielding material inside the drum that might hide the presence of special nuclear materials. The detectability limit of the new waste-drum assay system for plutonium is better than prior systems for actual waste materials. For the in-plant installation at a mixed-oxide fabrication facility, the detectability limit is 0.73 mg of {sup 24O}Pu (or 2.3 mg of high-burnup …
Date:
September 1, 1992
Creator:
Menlove, H. O.
Object Type:
Article
System:
The UNT Digital Library
Achieve!, September 1992
Periodic newsletter discussing information related to student drop-out rates, relevant legislative issues, and prevention programs. This issue focuses on improving the skills give to students in the education system.
Date:
September 1992
Creator:
Texas Research League
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Activist Alert: September 1992
September 1992 issue of Activist Alert from the NGLTF.
Date:
September 1992
Creator:
National Gay and Lesbian Task Force (U.S.)
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Advanced coal-fueled gas turbine systems
Westinghouse's Advanced Coal-Fueled Gas Turbine System Program (DE-AC2l-86MC23167) was originally split into two major phases - a Basic Program and an Option. The Basic Program also contained two phases. The development of a 6 atm, 7 lb/s, 12 MMBtu/hr slagging combustor with an extended period of testing of the subscale combustor, was the first part of the Basic Program. In the second phase of the Basic Program, the combustor was to be operated over a 3-month period with a stationary cascade to study the effect of deposition, erosion and corrosion on combustion turbine components. The testing of the concept, in subscale, has demonstrated its ability to handle high- and low-sulfur bituminous coals, and low-sulfur subbituminous coal. Feeding the fuel in the form of PC has proven to be superior to CWM type feed. The program objectives relative to combustion efficiency, combustor exit temperature, NO[sub x] emissions, carbon burnout, and slag rejection have been met. Objectives for alkali, particulate, and SO[sub x] levels leaving the combustor were not met by the conclusion of testing at Textron. It is planned to continue this testing, to achieve all desired emission levels, as part of the W/NSP program to commercialize the slagging combustor technology.
Date:
September 1, 1992
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Advanced coal-fueled gas turbine systems. Annual report, July 1991--June 1992
Westinghouse`s Advanced Coal-Fueled Gas Turbine System Program (DE-AC2l-86MC23167) was originally split into two major phases - a Basic Program and an Option. The Basic Program also contained two phases. The development of a 6 atm, 7 lb/s, 12 MMBtu/hr slagging combustor with an extended period of testing of the subscale combustor, was the first part of the Basic Program. In the second phase of the Basic Program, the combustor was to be operated over a 3-month period with a stationary cascade to study the effect of deposition, erosion and corrosion on combustion turbine components. The testing of the concept, in subscale, has demonstrated its ability to handle high- and low-sulfur bituminous coals, and low-sulfur subbituminous coal. Feeding the fuel in the form of PC has proven to be superior to CWM type feed. The program objectives relative to combustion efficiency, combustor exit temperature, NO{sub x} emissions, carbon burnout, and slag rejection have been met. Objectives for alkali, particulate, and SO{sub x} levels leaving the combustor were not met by the conclusion of testing at Textron. It is planned to continue this testing, to achieve all desired emission levels, as part of the W/NSP program to commercialize the slagging combustor technology.
Date:
September 1, 1992
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Advanced Coal Liquefaction Research and Development Facility, Wilsonville, Alabama
This report presents the results of Run 262 performed at the Advanced Coal Liquefaction R D Facility in Wilsonville, Alabama. The run started on July 10, 1991 and continued until September 30, 1991, operating in the Close-Coupled Integrated Two-Stage Liquefaction mode processing Black Thunder Mine subbituminous coal (Wyodak-Anderson seam from Wyoming Powder River Basin). A dispersed molybdenum catalyst was evaluated for its performance. The effect of the dispersed catalyst on eliminating solids buildup was also evaluated. Half volume reactors were used with supported Criterion 324 1/16'' catalyst in the second stage at a catalyst replacement rate of 3 lb/ton of MF coal. The hybrid dispersed plus supported catalyst system was tested for the effect of space velocity, second stage temperature, and molybdenum concentration. The supported catalyst was removed from the second stage for one test period to see the performance of slurry reactors. Iron oxide was used as slurry catalyst at a rate of 2 wt % MF coal throughout the run (dimethyl disulfide (DMDS) was used as the sulfiding agent). The close-coupled reactor unit was on-stream for 1271.2 hours for an on-stream factor of 89.8% and the ROSE-SR unit was on-feed for 1101.6 hours for an on-stream factor of …
Date:
September 1, 1992
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Advanced Coal Liquefaction Research and Development Facility, Wilsonville, Alabama
This report presents the results of Run 261 performed at the Advanced Coal Liquefaction R D Facility in Wilsonville, Alabama. The run started on January 12, 1991 and continued until May 31, 1991, operating in the Close-Coupled Integrated Two-Stage Liquefaction mode processing Illinois No. 6 seam bituminous coal (from Burning star No. 2 mine). In the first part of Run 261, a new bimodal catalyst, EXP-AO-60, was tested for its performance and attrition characteristics in the catalytic/catalytic mode of the CC-ITSL process. The main objective of this part of the run was to obtain good process performance in the low/high temperature mode of operation along with well-defined distillation product end boiling points. In the second part of Run 261, Criterion (Shell) 324 catalyst was tested. The objective of this test was to evaluate the operational stability and catalyst and process performance while processing the high ash Illinois No. 6 coal. Increasing viscosity and preasphaltenes made it difficult to operate at conditions similar to EXP-AO-60 catalyst operation, especially at lower catalyst replacement rates.
Date:
September 1, 1992
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Advanced Coal Liquefaction Research and Development Facility, Wilsonville, Alabama. Run 261 with Illinois No. 6 Burning Star Mine coal
This report presents the results of Run 261 performed at the Advanced Coal Liquefaction R & D Facility in Wilsonville, Alabama. The run started on January 12, 1991 and continued until May 31, 1991, operating in the Close-Coupled Integrated Two-Stage Liquefaction mode processing Illinois No. 6 seam bituminous coal (from Burning star No. 2 mine). In the first part of Run 261, a new bimodal catalyst, EXP-AO-60, was tested for its performance and attrition characteristics in the catalytic/catalytic mode of the CC-ITSL process. The main objective of this part of the run was to obtain good process performance in the low/high temperature mode of operation along with well-defined distillation product end boiling points. In the second part of Run 261, Criterion (Shell) 324 catalyst was tested. The objective of this test was to evaluate the operational stability and catalyst and process performance while processing the high ash Illinois No. 6 coal. Increasing viscosity and preasphaltenes made it difficult to operate at conditions similar to EXP-AO-60 catalyst operation, especially at lower catalyst replacement rates.
Date:
September 1, 1992
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Advanced Coal Liquefaction Research and Development Facility, Wilsonville, Alabama. Run 262 with Black Thunder subbituminous coal: Technical progress report
This report presents the results of Run 262 performed at the Advanced Coal Liquefaction R&D Facility in Wilsonville, Alabama. The run started on July 10, 1991 and continued until September 30, 1991, operating in the Close-Coupled Integrated Two-Stage Liquefaction mode processing Black Thunder Mine subbituminous coal (Wyodak-Anderson seam from Wyoming Powder River Basin). A dispersed molybdenum catalyst was evaluated for its performance. The effect of the dispersed catalyst on eliminating solids buildup was also evaluated. Half volume reactors were used with supported Criterion 324 1/16`` catalyst in the second stage at a catalyst replacement rate of 3 lb/ton of MF coal. The hybrid dispersed plus supported catalyst system was tested for the effect of space velocity, second stage temperature, and molybdenum concentration. The supported catalyst was removed from the second stage for one test period to see the performance of slurry reactors. Iron oxide was used as slurry catalyst at a rate of 2 wt % MF coal throughout the run (dimethyl disulfide (DMDS) was used as the sulfiding agent). The close-coupled reactor unit was on-stream for 1271.2 hours for an on-stream factor of 89.8% and the ROSE-SR unit was on-feed for 1101.6 hours for an on-stream factor of 90.3% …
Date:
September 1, 1992
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Advanced research in instrumentation and diagnostics technology
this research project will develop an ultrasonic flow imaging system based on tomographic technique. Initially, we will demonstrate both the reflection and diffraction tomographic applied to flow imaging. Then, the direct inversion problem will be examined. In this paper, we present the initial assessment of the feasibility and the evaluation of practical wedge designs. Major tasks of the project include (1) a feasibility study, (2) evaluation of sensing geometry and wedge design, (3) development of image reconstruction algorithm, and (4) flow tests of the imaging system. At present, we have completed the feasibility study and are in the process of evaluating wedge design.
Date:
September 1, 1992
Creator:
Sheen, S. H.; Lawrence, W. P. & Raptis, A. C.
Object Type:
Article
System:
The UNT Digital Library
Advanced water-cooled phosphoric acid fuel cell development
This program was conducted to improve the performance and minimize the cost of existing water-cooled phosphoric acid fuel cell stacks for electric utility and on-site applications. The goals for the electric utility stack technology were a power density of at least 175 watts per square foot over a 40,000-hour useful life and a projected one-of-a-kind, full-scale manufactured cost of less than $400 per kilowatt. The program adapted the existing on-site Configuration-B cell design to electric utility operating conditions and introduced additional new design features. Task 1 consisted of the conceptual design of a full-scale electric utility cell stack that meets program objectives. The conceptual design was updated to incorporate the results of material and process developments in Tasks 2 and 3, as well as results of stack tests conducted in Task 6. Tasks 2 and 3 developed the materials and processes required to fabricate the components that meet the program objectives. The design of the small area and 10-ft{sup 2} stacks was conducted in Task 4. Fabrication and assembly of the short stacks were conducted in Task 5 and subsequent tests were conducted in Task 6. The management and reporting functions of Task 7 provided DOE/METC with program visibility through …
Date:
September 1, 1992
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Advanced water-cooled phosphoric acid fuel cell development
The final task of the program addressed the testing of the three short stacks described above. The overall objective of this series of short stack tests was to verify the operation of the advanced cell design at both on-site and electric utility operating conditions. The small area development stack was operated first at atmosphenc pressure (to compare its characteristics to previous atmospheric tests) and then at 120 psia to examine its ability to operate at electric utility conditions. The 10-ft{sup 2} stack was also run at pressurized conditions to verify the scaling characteristics of the features developed in this program . The small area development stack was assembled and successfully tested for 3050 hours. The first 2380 hours of testing was conducted at atmospheric pressure, and the final 670 hours was at 120 psia pressurized conditions. As shown in Figure 1, performance was stable throughout testing. Intermediate and post test inspections of the stack showed parts to be in generally good condition with no anomalies.
Date:
September 1, 1992
Creator:
Scheffler, G. W. & Kemp, F. S.
Object Type:
Article
System:
The UNT Digital Library