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Probing the possibility of a /sup 12/C/sup 13/C abundance gradient from observations of interstellar CH/sup +/
I have performed high signal-to-noise (SN /equals/ 300 to 500) observations of interstellar CH/sup /plus// at Lick Observatory and at CTIO of the reddened, early-type stars HD 183143, HD 24432, and HD 157038 in an effort to probe the existence of a /sup 12/C/sup 13/C abundance gradient in our Galaxy.
Date:
September 16, 1987
Creator:
Hawkins, I.
Object Type:
Article
System:
The UNT Digital Library
[Memo from Rogers W. Redding, November 16, 1987]
Memo from Rogers W. Redding on November 16, 1987, sending a copy of a preliminary proposal to the fund for the improvement of postsecondary education for the Texas Academy of Mathematics and Science.
Date:
November 16, 1987
Creator:
Redding, Rogers W.
Object Type:
Paper
System:
The UNT Digital Library
[Letter to James R. Miller, June 16, 1987]
Letter from Jane to James R. Miller, on June 16, 1987, informing him that arrangements have been made for Miller to fly to Austin and back to attend the bill-signing ceremony.
Date:
June 16, 1987
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
[Letter from Barbara Jungjohan to the Student Life Committee, September 16, 1987]
Letter from Barbara Jungjohan to the members of the Student Life Committee, on September 16, 1987, thanking them for spending time with Dr. Julian C. Stanley. She encloses some materials Stanley thought might be helpful, and clears up a mistaken impression she gave at the last meeting.
Date:
September 16, 1987
Creator:
Jungjohan, Barbara
Object Type:
Letter
System:
The UNT Digital Library
[Letter from Julian C. Stanley to Rogers W. Redding, September 16, 1987]
Letter from Julian C. Stanley to Rogers W. Redding, on September 16, 1987, thanking him for the chance to speak to the TAMS Student Affairs Committee, and offering to consult on other matters that come up.
Date:
September 16, 1987
Creator:
Stanley, Julian C.
Object Type:
Letter
System:
The UNT Digital Library
[Letter from Alfred Hurley to James R. Miller, June 16, 1987]
Letter from Alfred Hurley to James R. Miller inviting him to the signing of the bill that will establish the Texas Academy of Mathematics and Science at North Texas State University, and to a luncheon being held by Hurley and his wife in Austin before the ceremony.
Date:
June 16, 1987
Creator:
Hurley, Alfred F.
Object Type:
Letter
System:
The UNT Digital Library
Acceptable residual magnetic fields in the background of a gas neutralizer
An approximate method is described to evaluate the maximum acceptable residual magnetic field in the background of a neutral beam. 5 refs., 8 figs.
Date:
October 16, 1987
Creator:
Fink, J.H.
Object Type:
Article
System:
The UNT Digital Library
The Canadian Record (Canadian, Tex.), Vol. 97, No. 29, Ed. 1 Thursday, July 16, 1987
Weekly newspaper from Canadian, Texas that includes local, state and national news along with extensive advertising.
Date:
July 16, 1987
Creator:
Ezzell, Ben & Ezzell, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
The Tulia Herald (Tulia, Tex.), Vol. 79, No. 16, Ed. 1 Thursday, April 16, 1987
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
April 16, 1987
Creator:
Tooley, Wendell
Object Type:
Newspaper
System:
The Portal to Texas History
The Tulia Herald (Tulia, Tex.), Vol. 79, No. 29, Ed. 1 Thursday, July 16, 1987
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
July 16, 1987
Creator:
Tooley, Wendell
Object Type:
Newspaper
System:
The Portal to Texas History
[Crownover Chapel Photograph #1]
Photograph of the Crownover Chapel, in Marble Falls, Texas.
Date:
July 16, 1987
Creator:
Rickard, Frances
Object Type:
Photograph
System:
The Portal to Texas History
[Crownover Chapel Photograph #2]
Photograph of the Crownover Chapel, in Marble Falls, Texas.
Date:
July 16, 1987
Creator:
Rickard, Frances
Object Type:
Photograph
System:
The Portal to Texas History
The Bogata News (Bogata, Tex.), Vol. 76, No. 29, Ed. 1 Thursday, April 16, 1987
Weekly newspaper from Bogata, Texas that includes local, state, and national news along with advertising.
Date:
April 16, 1987
Creator:
Nichols, Nanalee & Nichols, Thomas
Object Type:
Newspaper
System:
The Portal to Texas History
The Bogata News (Bogata, Tex.), Vol. 76, No. 42, Ed. 1 Thursday, July 16, 1987
Weekly newspaper from Bogata, Texas that includes local, state, and national news along with advertising.
Date:
July 16, 1987
Creator:
Nichols, Nanalee & Nichols, Thomas
Object Type:
Newspaper
System:
The Portal to Texas History
Demountable vacuum seals for fusion reactor applications
Demountable vacuum seals for fusion reactor applications must be compatible with the reactor environment, easily scalable, very reliable and readily maintained by remote handling methods. We are investigating gate valves as well as flanges in our efforts to provide such seals. They are all metal and scalable without becoming massive and require no axial fasteners. Preliminary tests on an initial 30 cm aluminum flange using no soft metal coatings or gaskets have given several vacuum tight closures. Weld fatigue of this preliminary design caused degradation of the seal with further cycling to leakage levels of 10/sup -6/ Tl/sec, which is acceptable with differential pumping for either valves or flanges. Additional flange pairs using slightly altered geometry, fabrication techniques, and seal plating materials will be tested and reported on.
Date:
October 16, 1987
Creator:
Batzer, T. H. & Call, W. R.
Object Type:
Article
System:
The UNT Digital Library
Overview of the TIBER II (Tokamak Ignition/Burn Experimental Reactor) design
The TIBER II Tokamak Ignition/Burn Experimental Reactor design is the result of efforts by numerous people and institutions, including many fusion laboratories, universities, and industries. While subsystems will be covered extensively in other reports, this overview will attempt to place the work in perspective. Major features of the design are compact size, low cost, and steady-state operation. These are achieved through plasma shaping and innovative features such as radiation tolerant magnets and optimized shielding. While TIBER II can operate in a pulsed mode, steady-state is preferred for nuclear testing. Current drive is achieved by a combination of lower hybrid and neutral beams. In addition, 10 MW of ECR is added for disruption control and current drive profiling. The TIBER II design has been the US option in preparation for the International Thermonuclear Experimental Reactor (ITER). Other equivalent national designs are the NET in Europe, the FER in Japan and the OTR in the USSR. These designs will help set the basis for the new international design effort. 9 refs.
Date:
October 16, 1987
Creator:
Henning, C. D. & Logan, B. G.
Object Type:
Article
System:
The UNT Digital Library
The need for a fusion technology information program
In providing an adequate energy technology for the future, which new programs should be considered by the Department of Energy national laboratories to ensure that the US remains in the forefront of international science and technology is an important question. This paper suggests that the urgency for energy independence demands an active communication program that would increase awareness of energy as a critical national issue and would present fusion, with its benefits and risks, as one of the long-term alternative energy sources.
Date:
June 16, 1987
Creator:
Correll, D.L. Jr.
Object Type:
Article
System:
The UNT Digital Library
Inferences drawn from shock-enhanced turbulent mixing analyses
This discussion concerns analyses of physical shock-tube and shock-boundary layer interaction experiments, supplemented by computations. The basic issue is that of evaluating the influence of reflected shock waves on enhancing the balance of turbulent kinetic energy and resultant turbulent materials mixing during implosion and shock reflection intervals. Increases in random velocity amplitudes of a factor of 5 or greater implying turbulent kinetic energy increases of a factor of 12 or more have been observed in some low Mach Number shock-tube and boundary-layer shock wave interaction experiments. These results are analyzed to estimate their influence on increased turbulent material mixing subsequent to shock interaction. The analyses are developed with the assistance of two-dimensional, pseudospectral free turbulent field shock interaction numerical simulations as well as compressible turbulent boundary-layer shock interaction calculations. Of particular interest is the influence of Mach Number and pre-existing turbulent intensity on the enhancement ratios. 24 refs., 8 figs.
Date:
October 16, 1987
Creator:
Buckingham, A.C.
Object Type:
Article
System:
The UNT Digital Library
The edge plasma and divertor in TIBER
An open divertor configuration has been adopted for TIBER. Most recent designs, including DIII-D, NET and CIT use open configurations and rely on a dense edge plasma to shield the plasma from the gas produced at the neutralizer plate. Experiments on ASDEX, PDX, D-III, and recently on DIII-D have shown that a dense edge plasma can be produced by re-ionizing most of the gas produced at the plate. This high recycling mode allows a large flux of particles to carry the heat to the plate, so that the mean energy per particle can be low. Erosion of the plate can be greatly reduced if the average impact energy of the ions at the plate can be reduced to near or below the threshold for sputtering of the plate material. The present configuration allows part of the flux of edge plasma ions to be neutralized at the entrance to the pumping duct so that helium is pumped as well as hydrogen. 7 refs., 3 figs.
Date:
October 16, 1987
Creator:
Barr, W.L.
Object Type:
Article
System:
The UNT Digital Library
Plasma parameters for alternate operating modes of TIBER-II
Parameters for operating points of TIBER-II, different from the baseline steady-state operation, are presented. These results have been generated with the MUMAK tokamak power balance code. Pulsed ignited and high performance steady-state operating points are described. 20 refs.
Date:
October 16, 1987
Creator:
Fenstermacher, M. E.; Devoto, R. S.; Logan, B. G. & Perkins, L. J.
Object Type:
Article
System:
The UNT Digital Library
TIBER II (Tokamak Ignition/Burn Experimental Reactor) parameters with neutral beams at high energies
The baseline neutral beam energy for TIBER II was chosen to be 500 keV consistent with the use of near term dc acceleration technology. Adequate penetration to the axis for core current drive in larger ETR devices requires higher beam energies. However, beam instabilities may limit the current drive efficiency at high energy to lower values than predicted classically. The characteristics of TIBER II and a device with 4.5 m major radius as functions of beam energy are presented. 11 refs.
Date:
October 16, 1987
Creator:
Devoto, R. S.; Fenstermacher, M. E. & Papanikolaou, P. G.
Object Type:
Article
System:
The UNT Digital Library
Microwave Superheaters for Fusion
The microwave superheater uses the synchrotron radiation from a thermonuclear plasma to heat gas seeded with an alkali metal to temperatures far above the temperature of material walls. It can improve the efficiency of the Compact Fusion Advanced Rankine (CFAR) cycle described elsewhere in these proceedings. For a proof-of-principle experiment using helium, calculations show that a gas superheat ..delta..T of 2000/sup 0/K is possible when the wall temperature is maintained at 1000/sup 0/K. The concept can be scaled to reactor grade systems. Because of the need for synchrotron radiation, the microwave superheater is best suited for use with plasmas burning an advanced fuel such as D-/sup 3/He. 5 refs.
Date:
October 16, 1987
Creator:
Campbell, R. B.; Hoffman, M. A. & Logan, B. G.
Object Type:
Article
System:
The UNT Digital Library
The ORNL beamline at the National Synchrotron Light Source
The Oak Ridge National Laboratory's (ORNL) beamline at the National Synchrotron Light Source (NSLS) incorporates several novel features including x-ray optics based on sagittal focusing with crystals and a cantilevered mirror whose center becomes the pivot for all downstream optical elements. Crystal focusing accepts a much larger horizontal divergence of radiation than a mirror while maintaining excellent momentum transfer and energy resolution. This sagittally bent crystal serves as the second element of a two-crystal, nondispersive monochromator. The cantilevered mirror provides a simple design for vertical focusing of the radiation. The beamline is suitable for both x-ray scattering and spectroscopy experiments requiring good energy resolution and high intensity in the energy range from 2.5 to 40 keV. This paper describes the optics of the ORNL beamline and reports their performance to date.
Date:
June 16, 1987
Creator:
Habenschuss, A.; Ice, G. E.; Sparks, C. J. & Neiser, R. A.
Object Type:
Article
System:
The UNT Digital Library
ICF special studies: Final report
This paper summarizes the work completed by W.J. Schafer Associates for Lawrence Livermore National Laboratory in the area of Inertial Confinement Fusion. The SAFIRE (Systems Analysis Code for ICF Reactor Economics) code is one of the major tasks discussed. (LSP)
Date:
September 16, 1987
Creator:
Meier, W. R.
Object Type:
Report
System:
The UNT Digital Library