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Multivariable current control for electrically and magnetically coupled superconducting magnets. Revision 1
Superconducting magnet systems under construction and projected for the future contain magnets that are magnetically coupled and electrically connected with shared power supplies. A change in one power supply voltage affects all of the magnet currents. A current controller for these system must be designed as a multivariable system. The power describes a method, based on decoupling control, for the rational design of these systems. Dynamic decoupling is achieved by cross-feedback of the measured currents. A network of gains at the input decouples the system statically and eliminates the steady-state error. Errors are then due to component variations. The method has been applied to the magnet system of the MFTF-B, at the Lawrence Livermore National Laboratory.
Date:
February 8, 1985
Creator:
Owen, E. W. & Shimer, D. W.
Object Type:
Article
System:
The UNT Digital Library
[News Clip: Domino Barber]
Video footage from the WBAP-TV station in Fort Worth, Texas, to accompany a news story by reporter Jack Kelso about Mesquite barber Ralph Foster who is a "master of dominos" along with his partner James Morgan of Mississippi. Morgan and Foster recently won the Doubles Championship in Lufkin. The story includes footage of Foster playing with Bill Hutchison and the exterior of "Ralph's Barber Shop."
Date:
May 8, 1985
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Mostek]
Video footage from the WBAP-TV station in Fort Worth, Texas, to accompany a news story by reporter Regina Benjamin about layoffs at United Technologies Mostek in Carrollton and other semi-conductor business. The story includes an interview with a Mostek representative and Mostek employees and footage of employees working. This story aired at 10:00 P.M.
Date:
May 8, 1985
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: White Collar Crime]
Video footage from the WBAP-TV station in Fort Worth, Texas, to accompany a news story about the increase in white collar crime in the Dallas Fort Worth metroplex. This story includes an interview with Ray Lall (sp.) who lists Paul Thayer and Billy Bob Harris as examples of white collar criminals. Also included are reenactments of this type of crime. This story aired at 6:00 P.M.
Date:
May 8, 1985
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Texas Video]
Video footage from the WBAP-TV station in Fort Worth, Texas, to accompany a news story by reporter Bobbie Wygant about the music video and song "Here is Our Love" which was recorded at music studios in Las Colinas by celebrities including Martina Navratilova, Roger Staubach, Steven Sills, Henry Thomas, Charley Pride, and Rusty Wier. The story includes footage of the song being performed and interviews with Charley Pride and Rusty Wier. This story aired at 5:00 P.M.
Date:
May 8, 1985
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Austin Bones]
Video footage from the WBAP-TV station in Fort Worth, Texas, to accompany a news story about Mastodon bones discovered in Austin during the construction of a building at 301 Congress Ave.. This b-roll footage shows an excavation and unidentified people examining the bones. This story aired at 10:00 P.M.
Date:
January 8, 1985
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Suicide Worker]
Video footage from the WBAP-TV station in Fort Worth, Texas, to accompany a news story by reporter Ron Trumbla about suicide and the Tarrant County Crisis Intervention Center. This story includes an interview with Tina who attempted suicide the previous year, an interview with an unidentified representative from the crisis center, an unidentified person answering a phone, and students in a classroom. This story aired at 6:00 P.M.
Date:
May 8, 1985
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
The Tulia Herald (Tulia, Tex.), Vol. 77, No. 32, Ed. 1 Thursday, August 8, 1985
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
August 8, 1985
Creator:
Tooley, Wendell
Object Type:
Newspaper
System:
The Portal to Texas History
The replacement of an electromagnetic primary sodium sampling pump in the Fast Flux Test Facility
On November 16, 1984 a leak was discovered in one of the Fast Flux Test Facility (FFTF) Primary Sodium Sampling System electromagnetic pumps. The leak was discovered in the course of routine cell entry to investigate a shorted trace heat element. The purpose of this paper is to describe the circumstances surrounding the occurrence of the leak, the actions taken to replace the damaged pump and the additional steps which were necessary to return the plant to power. In addition, the processes involved in producing the leak are described briefly. The relative ease of recovery from this incident is indicative of the overall feasibility of the Liquid Metal Reactor (LMR) operational concept.
Date:
November 8, 1985
Creator:
Grygiel, M. L. & McCargar, C. G.
Object Type:
Article
System:
The UNT Digital Library
[News Clip: Lennon]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
December 8, 1985, 10:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Charity Peddler]
B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
December 8, 1985, 10:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Fringe benefit taxes]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
January 8, 1985, 5:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Fort Worth Airline]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
February 8, 1985, 6:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Stockyard shootout]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
February 8, 1985, 10:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Legislature]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
January 8, 1985, 6:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: HS business]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
February 8, 1985, 5:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Rowlett Fire]
B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
March 8, 1985, 5:30 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
Multivariable current control for electrically and magnetically coupled superconducting magnets
Superconducting magnet systems under construction and projected for the future contain magnets that are magnetically coupled and electrically connected with shared power supplies. A change in one power supply voltage affects all of the magnet currents. A current controller for these systems must be designed as a multivariable system. The paper describes a method, based on decoupling control, for the rational design of these systems. Dynamic decoupling is achieved by cross-feedback of the measured currents. A network of gains at the input decouples the system statically and eliminates the steady-state error. Errors are then due to component variations. The method has been applied to the magnet system of the MFTF-B, at the Lawrence Livermore National Laboratory.
Date:
February 8, 1985
Creator:
Owen, E. W. & Shimer, D. W.
Object Type:
Article
System:
The UNT Digital Library
Synchrotron radiation shielding for SLC alcove electronics
The question has been raised concerning where to put lead shielding to reduce the synchrotron radiation dose to the electronics in the alcoves. Assuming that the alcoves are not near a collimator, the dominant radiation source is synchrotron radiation. Previous calculations indicate that a one-centimeter-thick lead door on the alcove would provide sufficient shielding. It was proposed that a one-half-inch-thick lead door be used (the next available thickness). The door would be roughly 36 square ft and weigh 1150 lbs. The alternative would be to shield the transport line, i.e., the open side of the magnets and the gaps between the magnets. We have done some further calculations concerning the possibilities of shielding the transport lines instead of the alcove. The point of contention in previous discussions is whether synchrotron radiation propagates as a gas down the tunnel or whether it is attenuated rapidly.
Date:
March 8, 1985
Creator:
McCall, R.C.; Ipe, N.E. & Shore, R.A.
Object Type:
Report
System:
The UNT Digital Library
Electron and ion cyclotron heating calculations in the tandem-mirror modeling code MERTH
To better understand and predict tandem-mirror experiments, we are building a comprehensive Mirror Equilibrium Radial Transport and Heating (MERTH) code. In this paper we first describe our method for developing the code. Then we report our plans for the installation of physics packages for electron- and ion-cyclotron heating of the plasma.
Date:
May 8, 1985
Creator:
Smith, G. R.
Object Type:
Article
System:
The UNT Digital Library
Qualitative comparisons of fusion reactor materials for waste handling and disposal
The activation of five structural materials and seven coolant/breeder/multiplier materials in a common reference neutron environment was calculated with the FORIG activation code. The reference environment was the neutron flux and spectrum at the first wall of the mirror advanced reactor study (MARS) reactor. Qualitative comparison of these activated materials were made with respect to worker protection requirements for gamma radiation in handling the materials and with respect to their classifications for near-surface disposal of radioactive waste.
Date:
April 8, 1985
Creator:
Maninger, R.C.
Object Type:
Article
System:
The UNT Digital Library
Role of ECRH in potential formation for tandem mirrors
The axial ion plugging potential in a tandem mirror is produced by electron cyclotron resonance heating (ECRH) applied at two locations in the end mirror cell. A second harmonic (..omega.. = 2..omega../sub c/) resonance is used near the midplane to generate hot electrons which yield an electron potential barrier between center cell electrons and electrons outboard of the end cell midplane. The latter group of electrons is then heated at the fundamental resonance (..omega.. = ..omega../sub c/) on the outboard side of the magnetic well which drives an ion confining potential. Fokker-Planck and Monte Carlo calculations show that such a configuration is achievable, and the scaling obeys a rather simple set of equations. Another aspect of this configuration is the experimental observation that the fundamental heating drives the overall potential of the device relative to the wall to approx. 1 kV. An analytic model predicts this behavior for very strong ECRH. Results are given a numerical study of electron confinement in a mirror cell owing to fundamental heating as the level of the rf electric field, E/sub rf/, is increased. For the second part of the paper, we show that moderate levels of uniformly distributed rf fields, called cavity fields, …
Date:
May 8, 1985
Creator:
Rognlien, T. D.; Matsuda, Y. & Stewart, J. J.
Object Type:
Article
System:
The UNT Digital Library
Atomic vapor laser isotope separation
Atomic vapor laser isotope separation (AVLIS) is a general and powerful technique. A major present application to the enrichment of uranium for light-water power reactor fuel has been under development for over 10 years. In June 1985 the Department of Energy announced the selection of AVLIS as the technology to meet the nation's future need for the internationally competitive production of uranium separative work. The economic basis for this decision is considered, with an indicated of the constraints placed on the process figures of merit and the process laser system. We then trace an atom through a generic AVLIS separator and give examples of the physical steps encountered, the models used to describe the process physics, the fundamental parameters involved, and the role of diagnostic laser measurements.
Date:
November 8, 1985
Creator:
Stern, R.C. & Paisner, J.A.
Object Type:
Article
System:
The UNT Digital Library
[News Clip: AIDS/Wadley]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
March 8, 1985, 6:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library