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Thyratron characteristics under high di/dt and high-repetition-rate operation

Description: Power conditioning systems for high peak and average power, high repetition rate discharge excited lasers involve operation of modulator components in unconventional regimes. Reliable operation of switches and energy storage elements under high voltage and high di/dt conditions is a pacing item for laser development at the present time. To test and evaluate these components a Modulator Component Test Facility (MCTF) was constructed. The MCTF consists of a command charge system, energy storage c… more
Date: May 11, 1981
Creator: Ball, D.; Hill, J. & Kan, T.
Partner: UNT Libraries Government Documents Department
open access

Data acquisition system for the HHIRF spin spectrometer

Description: The Spin Spectrometer at the Holifield Heavy Ion Research Facility (HHIRF) is a multidetector ..gamma..-ray spectrometer consisting of 72 separate NaI detector elements closely packed in a 4..pi.. geometry. The basic apparatus was constructed at Washington University and has been installed and implemented at the HHIRF at Oak Ridge National Laboratory. The spectrometer was designed especially for the investigation of the mechanisms of heavy-ion induced nuclear reactions and of the structure of n… more
Date: May 28, 1981
Creator: Hensley, D.C.
Partner: UNT Libraries Government Documents Department
open access

Workshop on core and sample curation for the National Continental Scientific Drilling Program

Description: The Workshop on Core and Sample Curation was held to discuss the best means of handling, distributing, and advertising samples and data collected during a Continental Scientific Drilling Program (CSDP) and to establish better communication between sample curators regarding common problems. It was geneerally agreed that CSDP samples should be handled, on a regional basis, by existing data systems and sample repositories judged to have adequate staff and support. Repository design, sample handlin… more
Date: May 6, 1981
Creator: Goff, S. & Heiken, G. (eds.)
Partner: UNT Libraries Government Documents Department
open access

Controversial issues confronting the BEIR III committee: implications for radiation protection

Description: This paper reviews the state-of-the-art for conducting risk assessment studies, especially known and unknown factors relative to radioinduced cancer or other diseases, sources of scientific and epidemiological data, dose-response models used, and uncertainties which limit precision of estimation of excess radiation risks. These are related to decision making for radiation protection policy. (PSB)
Date: May 1, 1981
Creator: Fabrikant, Jacob I.
Partner: UNT Libraries Government Documents Department
open access

X-ray backlighting sources of 4 to 10 keV for laser-fusion targets

Description: High-intensity, short-duration x-ray pulses are necessary to diagnose the compression of laser film targets. Present target designs are such that backlighting sources ranging from a few thousand electron volts to 100 keV will be necessary. The desired source durations range from a few tens of picoseconds for flash radiography to several nanoseconds for streaked backlighting, and the source occurrence must be tightly synchronized to that of the target-irradiating laser pulse. For the latter reas… more
Date: May 12, 1981
Creator: Rupert, V. C.; Matthews, D. L. & Koppel, L. N.
Partner: UNT Libraries Government Documents Department
open access

Radiation shielding issues on the FMIT

Description: The Fusion Materials Irradiation Test Facility (FMIT) is being built to study neutron radiation effects in candidate fusion reactor materials. The FMIT will yield high fluence data in a fusion-like neutron radiation environment produced by the interaction of a 0.1A, 35 MeV deuteron beam with a flowing lithium target. The design of the facility as a whole is driven by a high availability requirement. The variety of radiation environments in the facility requires the use of diverse and extensive … more
Date: May 1, 1981
Creator: Burke, R.J.; Davis, A.A.; Huang, S. & Morford, R.J.
Partner: UNT Libraries Government Documents Department
open access

Intermediate-energy nuclear chemistry workshop

Description: This report contains the proceedings of the LAMPF Intermediate-Energy Nuclear Chemistry Workshop held in Los Alamos, New Mexico, June 23-27, 1980. The first two days of the Workshop were devoted to invited review talks highlighting current experimental and theoretical research activities in intermediate-energy nuclear chemistry and physics. Working panels representing major topic areas carried out indepth appraisals of present research and formulated recommendations for future research directio… more
Date: May 1, 1981
Creator: Butler, G. W.; Giesler, G. C.; Liu, L. C.; Dropesky, B. J.; Knight, J. D.; Lucero, F. et al.
Partner: UNT Libraries Government Documents Department
open access

Measurement of two-particle correlations in 800 MeV pA collisions

Description: Two-particle (p-p,p-d) coincidence has been measured in p + A collisions. Production mechanism of backscattered proton has been studied by forward-backward coincidence events. Data show the importance of 2N-cluster scattering and/or multiple scattering processes involving a few nucleons. They also show that the nucleon-nucleon quasi-elastic-scattering is not the dominant part of the backscattered proton production.
Date: May 1, 1981
Creator: Tanihata, I.; Miake, Y.; Hamagaki, H.; Kadota, S.; Shida, Y.; Lombard, R. et al.
Partner: UNT Libraries Government Documents Department
open access

What can we learn from inclusive spectra

Description: The present experimental status on single particle inclusive measurements is described. Then, the geometrical aspect of the collision is discussed from the data of total integrated cross sections of nuclear charge or mass. The dynamical aspect of the collision, especially that for the participating region is discussed in connection with proton spectra, composite fragment spectra, pion production, ratios of ..pi../sup -//..pi../sup +/, n/p and t//sup 3/He, and production of strange particles. Th… more
Date: May 1, 1981
Creator: Nagamiya, S.
Partner: UNT Libraries Government Documents Department
open access

Two-photon physics as a probe of hadron dynamics

Description: Two-photon collisions provide an ideal laboratory for testing many features of quantum chromodynamics, especially the interplay between the vector-meson-dominated and point-like hadronic interactions of the photon. A number of QCD applications are discussed, including: jet and single-particle production at large transverse momentum; the photon structure function and its relationship to the ..gamma.. ..-->.. q anti q wave function; and the possible role of gluonium states in the ..gamma gamma.. … more
Date: May 1, 1981
Creator: Brodsky, Stanley J.
Partner: UNT Libraries Government Documents Department
open access

Evaluation of cracking in steam generator feedwater piping in pressurized water reactor plants

Description: Cracking in feedwater piping was detected near the inlet to steam generators in 15 pressurized water reactor plants. Sections with cracks from nine plants are examined with the objective of identifying the cracking mechanism and assessing various factors that might contribute to this cracking. Using transmission electron microscopy, fatigue striations are observed on replicas of cleaned crack surfaces. Calculations based on the observed striation spacings gave a cyclic stress value of 150 MPa (… more
Date: May 1, 1981
Creator: Goldberg, A. & Streit, R. D.
Partner: UNT Libraries Government Documents Department
open access

Petite unification: an alternative viewpoint

Description: It is assumed that at some distance scale, not too many orders of magnitude less than the compton wavelength of intermediate bosons W/sup + -/ and Z/sup 0/, the SU(3)/sub c/ x SU(2)/sub L/ x U(1)/sub Y/ gauge theory, characterized by three coupling constants, becomes embedded in a gauge theory G/sub S/ x G/sub W/ characterized by only two coupling constants, g/sub S/ and g/sub W/. The strong group G/sub S/ and weak group G/sub W/ are assumed each to be either simple or pseudo-simple i.e. a dire… more
Date: May 1, 1981
Creator: Hung, P.Q.
Partner: UNT Libraries Government Documents Department
open access

Epidemiological studies on radiation carcinogenesis in human populations following acute exposure: nuclear explosions and medical radiation

Description: The current knowledge of the carcinogenic effect of radiation in man is considered. The discussion is restricted to dose-incidence data in humans, particularly to certain of those epidemiological studies of human populations that are used most frequently for risk estimation for low-dose radiation carcinogenesis in man. Emphasis is placed solely on those surveys concerned with nuclear explosions and medical exposures. (ACR)
Date: May 1, 1981
Creator: Fabrikant, Jacob I.
Partner: UNT Libraries Government Documents Department
open access

LBL EBIS Program

Description: It has been decided to increase the energy range of the LBL 88-Inch Cyclotron by constructing an advanced ion source for installation on the existing axial injection system. The type of advanced ion source chosen is the Electron Beam Ion Source. The energy range will be increased to 40 MeV/nucleon for the lighter heavy ions and with development to over 20 MeV/nucleon at mass 100. Besides the 88-inch Cyclotron, present accelerators at LBL include the SuperHILAC, with beam energy up to 8.5 MeV/A,… more
Date: May 1, 1981
Creator: Brown, I. & Feinberg, B.
Partner: UNT Libraries Government Documents Department
open access

Design and economics of direct-contact salt hydrate storage systems

Description: A salt-hydrate latent heat storage system is described in which oil is injected at the bottom of the container and exchanges heat as it floats to the top where it is pumped back to the heat source. Experiments are described which are meant to solve two problems. The first problem is to reliably inject the oil into the salt phase. The second is to minimize the carryover of salt hydrate into the oil, which can be done using two-stage coalescer-filters. Three systems are described and compared: a … more
Date: May 1, 1981
Creator: Wright, J. D.
Partner: UNT Libraries Government Documents Department
open access

Microprocessor control and data acquisition at the LLNL 100-MeV accelerator

Description: A distributed microprocessor control and data acquisition network has been designed for implementation on the Lawrence Livermore National Laboratory 100 MeV electron/positron accelerator (LINAC). The system has been designed to be as transparent to the user as possible by stressing responsiveness, reliability, and relevance of data presented to the user. Implementation of the network will take place in modular fashion in three stages, so as to minimize disruption of normal operations. The first… more
Date: May 26, 1981
Creator: Mendonca, M.L.
Partner: UNT Libraries Government Documents Department
open access

Nova Event Logging System

Description: Nova is a 200 terawatt, 10-beam High Energy Glass Laser currently under construction at LLNL. This facility, designed to demonstrate the feasibility of laser driven inertial confinement fusion, contains over 5000 elements requiring coordinated control, data acquisition, and analysis functions. The large amounts of data that will be generated must be maintained over the life of the facility. Often the most useful but inaccessible data is that related to time dependent events associated with, for… more
Date: May 11, 1981
Creator: Calliger, R.J. & Suski, G.J.
Partner: UNT Libraries Government Documents Department
open access

Three recent TDHF calculations

Description: Three applications of TDHF are discussed. First, vibrational spectra of a post grazing collision /sup 40/Ca nucleus is examined and found to contain many high energy components, qualitatively consistent with recent Orsay experiments. Second, the fusion cross section in energy and angular momentum are calculated for /sup 16/O + /sup 24/Mg to exhibit the parameters of the low l window for this system. A sensitivity of the fusion cross section to the effective two body potential is discussed. Last… more
Date: May 1, 1981
Creator: Weiss, M.S.
Partner: UNT Libraries Government Documents Department
open access

Use of the ECL-CAMAC trigger processor system for recoil missing mass triggers at the Tagged Photon Spectrometer at Fermilab

Description: A trigger processor in operation since May 1980 at the Tagged Photon Spectrometer at Fermilab will be described. The processor, based on the Fermilab ECL-CAMAC system, allows fast selection of high mass diffractive events from the total hadronic cross section. Data from a recoil detector, consisting of 3 wire chambers and 4 layers of scintillator concentric about a 1.5 m liquid hydrogen target, is digitized and presented to the processor within 3 sec. From the chamber data are found the vertice… more
Date: May 1, 1981
Creator: Martin, J.; Bracker, S.; Hartner, G.; Appel, J. & Nash, T.
Partner: UNT Libraries Government Documents Department
open access

Reactivity analysis of core distortion effects in the FFTF

Description: Three main conclusions can be drawn from this work. For the FFTF and similar liquid metal fast reactors: (1) A simple ring-wise worth gradient does not adequately describe distortion reactivity effects of heterogeneous hexagonal components. (2) The chopped cosine-squared model for the axial shape of the distortion reactivity is not completely correct; the axial shape depends on radial position. (3) The presence of control rods in the core increases (in the negative direction) distortion reactiv… more
Date: May 1, 1981
Creator: Knutson, B. J.; Lucoff, D. M.; Harris, R. A. & Hecht, S. L.
Partner: UNT Libraries Government Documents Department
open access

Configuring the thermochemical hydrogen sulfuric acid process step for the Tandem Mirror Reactor

Description: This paper identifies the sulfuric acid step as the critical part of the thermochemical cycle in dictating the thermal demands and temperature requirements of the heat source. The General Atomic Sulfur-Iodine Cycle is coupled to a Tandem Mirror. The sulfuric acid decomposition process step is focused on specifically since this step can use the high efficiency electrical power of the direct converter together with the other thermal-produced electricity to Joule-heat a non-catalytic SO/sub 3/ dec… more
Date: May 1, 1981
Creator: Galloway, T.R.
Partner: UNT Libraries Government Documents Department
open access

Mass spectrometry with a very small cyclotron

Description: It is proposed that direct detection of natural radioisotopes can be accomplished by using a very low energy (20 to 100 keV) cyclotron accelerating negative ions.
Date: May 1, 1981
Creator: Muller, R. A.; Tans, P. P.; Mast, T. S. & Welch, J. J.
Partner: UNT Libraries Government Documents Department
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