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Production of muons for fusion catalysis in a magnetic mirror configuration. Revision 1
For muon-catalyzed fusion to be of practical interest, a very efficient means of producing muons must be found. We describe a scheme for producing muons that may be more energy efficient than any heretofore proposed. There are, in particular, some potential advantages of creating muons from collisions of high energy tritons confined in a magnetic mirror configuration. If one could catalyze 200 fusions per muon and employ a uranium blanket that would multiply the neutron energy by a factor of 10, one might produce electricity with an overall plant efficiency (ratio of electric energy produced to nuclear energy released) approaching 30%. One possible near term application of a muon-producing magnetic-mirror scheme would be to build a high-flux neutron source for radiation damage studies. The careful arrangement of triton orbits will result in many of the ..pi../sup -/'s being produced near the axis of the magnetic mirror. The pions quickly decay into muons, which are transported into a small (few-cm-diameter) reactor chamber producing approximately 1-MW/m/sup 2/ neutron flux on the chamber walls, using a laboratory accelerator and magnetic mirror. The costs of construction and operation of the triton injection accelerator probably introduces most of the uncertainty in the viability of this …
Date:
July 25, 1986
Creator:
Moir, R.W. & Chapline, G.F. Jr.
Object Type:
Article
System:
The UNT Digital Library
Measured resolutions of the Arc and Linac BPM systems
The 6'' long final focus beam position monitors (short FF BPM's are longer, thus deliver more signal after a 15 nanosecond filter, than either the Linac or Arc monitors. The purpose of this note is to compare the resolution of the Arc vs Linac electronics when applied to a short FF 2'' diameter BPM. A method of calibrating the Arc modules is also tested and briefly discussed. The range of each DAC setting to minimize digitization error is also calculated.
Date:
August 25, 1986
Creator:
Pappas, D. & Tentindo, S.
Object Type:
Report
System:
The UNT Digital Library
Hydrodynamic effects in evaporating droplets
The vaporization of a spherically symmetric liquid droplet homogeneously heated by a high-intensity laser pulse is investigated on the basis of a hydrodynamic description of the system composed of the vapor and ambient gas. In the limit of convective vaporization, the boundary conditions at the fluid-gas interface are formulated by using the notion of a Knudsen layer across which translational equilibrium is established. Numerical solutions to the hydrodynamic equations exhibit the existence of two shock waves propagating in opposite directions with respect to the contact discontinuity that separates the ambient gas and vapor. 17 refs., 6 figs.
Date:
September 25, 1986
Creator:
Armstrong, R.L. & Zardecki, A.
Object Type:
Article
System:
The UNT Digital Library
The Tulia Herald (Tulia, Tex.), Vol. 78, No. 52, Ed. 1 Thursday, December 25, 1986
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
December 25, 1986
Creator:
Tooley, Wendell
Object Type:
Newspaper
System:
The Portal to Texas History
The Tulia Herald (Tulia, Tex.), Vol. 78, No. 39, Ed. 1 Thursday, September 25, 1986
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
September 25, 1986
Creator:
Tooley, Wendell
Object Type:
Newspaper
System:
The Portal to Texas History
[Letter from Mark White to WASP, September 25, 1986]
Letter from Mark White to WASP welcoming them to Texas and acknowledging their service in World War 2.
Date:
September 25, 1986
Creator:
Texas. Governor (1983-1987 : White)
Object Type:
Letter
System:
The Portal to Texas History
The Bogata News (Bogata, Tex.), Vol. 76, No. 13, Ed. 1 Thursday, December 25, 1986
Weekly newspaper from Bogata, Texas that includes local, state, and national news along with advertising.
Date:
December 25, 1986
Creator:
Nichols, Nanalee & Nichols, Thomas
Object Type:
Newspaper
System:
The Portal to Texas History
[News Clip: Texas Austerity]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
February 25, 1986, 6:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
The Bogata News (Bogata, Tex.), Vol. 75, No. 51, Ed. 1 Thursday, September 25, 1986
Weekly newspaper from Bogata, Texas that includes local, state, and national news along with advertising.
Date:
September 25, 1986
Creator:
Nichols, Nanalee & Nichols, Thomas
Object Type:
Newspaper
System:
The Portal to Texas History
Production of muons for fusion catalysis in a magnetic mirror configuration
One possible near term application of a muon-producing magnetic-mirror scheme would be to build a high-flux neutron source for radiation damage studies. The careful arrangement of triton orbits will result in many of the ..pi../sup -/s being produced near the axis of the magnetic mirror. The pions quickly decay into muons, which are transported into a small (few-cm-diameter) reactor chamber producing approximately 1-MW/m/sup 2/ neutron flux on the chamber walls, using a laboratory accelerator and magnetic mirror. The costs of construction and operation of the triton injection accelerator probably introduces most of the uncertainty in the viability of this scheme. If a 10-..mu..A, 600 MeV neutral triton accelerator could be built for less than $100 million and operated cheaply enough, one might well bring muon-catalyzed fusion into practical use.
Date:
June 25, 1986
Creator:
Moir, R.W. & Chapline, G.F. Jr.
Object Type:
Article
System:
The UNT Digital Library
Atomic physics and non-equilibrium plasmas
Three lectures comprise the report. The lecture, Atomic Structure, is primarily theoretical and covers four topics: (1) Non-relativistic one-electron atom, (2) Relativistic one-electron atom, (3) Non-relativistic many-electron atom, and (4) Relativistic many-electron atom. The lecture, Radiative and Collisional Transitions, considers the problem of transitions between atomic states caused by interactions with radiation or other particles. The lecture, Ionization Balance: Spectral Line Shapes, discusses collisional and radiative transitions when ionization and recombination processes are included. 24 figs., 11 tabs.
Date:
April 25, 1986
Creator:
Weisheit, J.C.
Object Type:
Report
System:
The UNT Digital Library
Neutron capture cross sections for /sup 86/Sr and /sup 87/Sr at stellar temperatures. Revision 1
Recent work on s-process nucleosynthesis has focused attention on the investigation of capture cross sections for nuclei in the mass region near the N = 50 closed neutron shell. Of special astrophysical interest are (i) the analysis of the s-process branching through /sup 85/Kr as a monitor of stellar neutron density and temperature and (ii) the investigation of the possible chronometric pair /sup 87/Rb-/sup 87/Sr as an independent measure of the age of the galaxy. For both problems the capture cross sections of the two pure s-process nuclei /sup 86/Sr and /sup 87/Sr have to be known to an accuracy of 5% or better. The current investigation of the neutron capture cross sections for /sup 86/Sr and /sup 87/Sr was undertaken to extend recent measurements by Walter and Beer to energies below 3.5 keV, where strong resonances are known to exist, and to explore the discrepancy in the results of the Maxwellian averaged capture cross section of /sup 87/Sr at kT = 30 keV as reported by previous investigators. 9 refs., 1 fig.
Date:
June 25, 1986
Creator:
Bauer, R. W.; Mathews, G. J.; Becker, J. A.; Howe, R. E. & Ward, R. A.
Object Type:
Report
System:
The UNT Digital Library
Construction and operation of the 12-T superconducting coils for the Mirror Fusion Test Facility
We have successfully constructed and tested a pair of high-field coils that is part of the magnet set of the Mirror Fusion Test Facility (MFTF-B) at the Lawrence Livermore National Laboratory. Each coil consists of a multifilamentary Nb/sub 3/Sn magnet nested inside a multifilamentary NbTi magnet. During our test, these coils produced a central field of 12 T, with a peak conductor field of 12.5 T. The dimensions of the Nb/sub 3/Sn insert coil are: 1.34-m bore, 2.57-m outer diameter, and 1.14-m overall length. These coils were designed to be fully cryogenically stabilized and cooled by pool-boiling liquid helium. The operating current density of the Nb/sub 3/Sn coils is 2000 A/cm/sup 2/ and 2400 A/cm/sup 2/ for the NbTi magnet. In this paper, we present design considerations and details, construction techniques, and operational results of these coils.
Date:
September 25, 1986
Creator:
Zbasnik, J. P.; Kozman, T. A.; Shimer, D. W. & Hathaway, D. R.
Object Type:
Article
System:
The UNT Digital Library
An astrometric search for a stellar companion to the sun
A companion star within 0.8 pc of the Sun has been postulated to explain a possible 26 Myr periodicity in mass extinctions of species on the Earth. Such a star would already be catalogued in the Yale Bright Star catalogue unless it is fainter than m/sub nu/ = 6.5; this limits the possible stellar types for an unseen companion to red dwarfs, brown dwarfs, or compact objects. Red dwarfs account for about 75% of these possible stars. We describe here the design and development of an astrometric search for a nearby red dwarf companion with a six-month peak-to-peak parallax of greater than or equal to2.5 arcseconds. We are measuring the parallax of 2770 candidate faint red stars selected from the Dearborn Observatory catalogue. An automated 30-inch telescope and CCD camera system collect digitized images of the candidate stars, along with a 13' x 16' surrounding field of background stars. Second-epoch images, taken a few months later, are registered to the first epoch images using the background stars as fiducials. An apparent motion, m/sub a/, of the candidate stars is found to a precision of sigma/sub m//sub a/ approx. = 0.08 pixel approx. = 0.2 arcseconds for fields with N/sub fiducial/ …
Date:
November 25, 1986
Creator:
Perlmutter, S.
Object Type:
Report
System:
The UNT Digital Library
Recent measurements of coherent transition radiation
An extended series of experiments has been used to investigate transition radiation in the x-ray spectral region. The x-rays were generated at the Lawrence Livermore National Laboratory electron-positron linear accelerator by 54 MeV electrons traversing multiple thin-foil targets. The measured angular and spectral distributions have shown excellent agreement with calculated predictions based on a simplified theoretical description of transition radiation. Recently, energy-resolved measurements of x-ray generation by targets consisting of multiple closely-spaced foils has clearly demonstrated the longitudinal coherence of transition radiation. This behavior might lead to a variety of applications such as tuneable narrow-band x-ray sources, measurement of x-ray dielectric constants, or particle beam diagnostics. These issues will be discussed, and recent results will be presented.
Date:
September 25, 1986
Creator:
Moran, M. J.
Object Type:
Article
System:
The UNT Digital Library
A low background-rate detector for ions in the 5 to 50 keV energy range to be used for radioisotope dating with a small cyclotron
Accelerator mass spectrometry in tandem Van de Graaff accelerators has proven successful for radioisotope dating small samples. We are developing a 20 cm diameter 30 to 40 keV cyclotron dedicated to high-sensitivity radioisotope dating, initially for /sup 14/C. At this energy, range and dE/dx methods of particle identification are impossible. Thus arises the difficult problem of reliably detecting 30 to 40 keV /sup 14/C at 10/sup -2/ counts/sec in the high background environment of the cyclotron, where lower energy ions, electrons, and photons bombard the detector at much higher rates. We have developed and tested an inexpensive, generally useful ion detector that allows dark-count rates below 10/sup -4/ counts/sec and excellent background suppression. With the cyclotron tuned near the /sup 13/CH background peak, to the frequency for /sup 14/C, the detector suppresses the background to 6 x 10/sup -4/ counts/sec. For each /sup 14/C ion the detectors grazing-incidence Al/sub 2/O/sub 3/ conversion dynode emits about 20 secondary electrons, which are independently multiplied in separate pores of a microchannel plate. The output signal is proportional to the number of secondary electrons, allowing pulse-height discrimination of background. We have successfully tested the detector with positive /sup 12/C, /sup 23/Na, /sup 39/K, /sup …
Date:
November 25, 1986
Creator:
Friedman, P.G.
Object Type:
Report
System:
The UNT Digital Library
Meson West beamline spoiler magnets electrical design and test report
This report describes the design and construction of five spoiler magnets installed in the secondary beamline to the Meson West Experimental Hall. Tests have been performed to measure the magnetic field in the steel as a function of the excitation current. B versus I curves for each spoiler are included. The leakage field in the beam pipe through the spoiler steel was too high. Magnetic shield and reduced excitation are used to lower this leakage field to acceptable levels.
Date:
November 25, 1986
Creator:
Visser, A.T.
Object Type:
Report
System:
The UNT Digital Library
The Cherokeean. (Rusk, Tex.), Vol. 138, No. 33, Ed. 1 Thursday, September 25, 1986
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
September 25, 1986
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Cherokeean. (Rusk, Tex.), Vol. 138, No. 46, Ed. 1 Thursday, December 25, 1986
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
December 25, 1986
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
[Arlington Police Chaplain Harold Elliott's film "Suicide is not painless" newspaper article from the Arlington Daily News, 1986]
Photograph of an article written by Nancy Visser from the Arlington Daily News about the 22-minute docudrama promoted by Chaplain Harold Elliott on teenage suicide. The title of the article is "Special film to show pain of suicide." It shows a picture of Chaplain Elliott watching a film crew prepare for a scene near Lake Arlington. The title of Chaplain Elliott's film is "Suicide is not painless." The film has been shown in schools, foriegn countries, and the military.
Date:
February 25, 1986
Creator:
Visser, Nancy
Object Type:
Photograph
System:
The Portal to Texas History
[Press Conference Statement - January 25, 1986]
Press conference statement released by Organizations United for Eastside Development (OUED). They are calling for a mass reform of the San Antonio police force and its accompanying organization - the San Antonio Police Officers Association (S.A.P.O.A). The OUED claims that both have not held their officers accountable for various instances of police brutality and violence.
Date:
January 25, 1986
Creator:
Organizations United for Eastside Development
Object Type:
Text
System:
The Portal to Texas History
[Letter from Dan H. Laurence to Louis Leroy - February 25, 1986]
Letter from Dan H. Laurence to Louis Leroy of the San Antonio Arts Council. Mr. Laurence is writing a recommendation for Sterling Houston, a prominent playwright and actor in San Antonio who applied for a thousand dollar grant from the council. Mr. Laurence praises Houston's professionalism and dynamism, noting that a grant would be a great show of support for a minority performer of Houston's caliber.
Date:
February 25, 1986
Creator:
Laurence, Dan H.
Object Type:
Letter
System:
The Portal to Texas History
[Reflections on Dr. Martin Luther King, Jr.]
Program for Project LEAD: Reflections on Dr. Martin King, Jr. Mini Workshop and Poster Contest. The workshop occurred on November 25th, 1986.
Date:
November 25, 1986
Creator:
Links, Inc. San Antonio Chapter.
Object Type:
Pamphlet
System:
The Portal to Texas History
[Poster Art Contest]
Flyer regarding a poster art contest hosted by the San Antonio Chapter of Links, Inc. Poster entries were due by December 2nd, 1986.
Date:
November 25, 1986
Creator:
Links, Inc. San Antonio Chapter.
Object Type:
Text
System:
The Portal to Texas History