Search Results

Advanced search parameters have been applied.
open access

DT fusion neutron radiation strengthening of copper and niobium

Description: The initial results of a comparative study of the radiation strengthening and damage structures produced in Cu and Nb by D-T fusion and fission reactor neutrons are described. The radiation strengthening produced by a given fluence of fusion neutrons above about 10$sup 17$ n/cm$sup 2$ is equal to that produced by a fluence of fission reactor neutrons (E greater than 0.1 MeV) ten times as great. This difference is about twice as large as would be expected if the strengthening scaled with damage … more
Date: September 29, 1975
Creator: Mitchell, J.B.; Van Konynenburg, R.A.; Echer, C.J. & Parkin, D.M.
Partner: UNT Libraries Government Documents Department
open access

Neutron damage calculations in Cu, Nb, and Au to 32 MeV: application to sputtering and deuteron-breakup neutron sources

Description: Primary recoil distributions and specific damage energies have been computed for high energy deuteron-breakup neutrons in Cu, Nb, and Au. The calculations are based on theoretical neutron cross sections, and consider in particular a d-Be spectrum broadly peaked at 15 MeV with some neutrons above 30 MeV. The theoretical results are similar to corresponding calculations for monoenergetic 15-MeV neutrons and are in good agreement with range measurements of (n,2n) recoils generated by high energy d… more
Date: February 1, 1976
Creator: Roberto, J.B.; Robinson, M.T. & Fu, C.Y.
Partner: UNT Libraries Government Documents Department
open access

DT fusion neutron radiation strengthening of copper and niobium

Description: The initial results of a comparative study of the radiation strengthening and damage structures produced in Cu and Nb by D-T fusion and fission reactor neutrons are described. The radiation strengthening produced by a given fluence of fusion neutrons above about 10$sup 17$n/cm$sup 2$ is equal to that produced by a fluence of fission reactor neutrons (E greater than 0.1 MeV) ten times as great. This difference is about twice as large as would be expected if the strengthening scaled with damage e… more
Date: October 30, 1975
Creator: Mitchell, J.B.; Van Konynenburg, R.A.; Echer, C.J. & Parkin, D.M.
Partner: UNT Libraries Government Documents Department
open access

Irradiation of graphite cloth at various temperatures with deutrons and helium ions

Description: Graphite cloth samples were irradiated with 100 keV deuterons and $sup 4$He$sup +$ ions at room temperature and at elevated temperatures. Scanning electron microscopy was used to examine the surfaces of irradiated and unirradiated graphite fibers. Irradiation at room temperature with $sup 4$He$sup +$ to a total dose of 3.1 x 10$sup 18$ ions cm$sup -2$ produces considerable flaking of individual fibers, which is not observed on unirradiated fibers. Identical irradiations at 400$sup 0$ and 800$su… more
Date: January 1, 1975
Creator: Ekern, R.; Das, S.K. & Kaminsky, M.
Partner: UNT Libraries Government Documents Department
open access

Radiation damage by $sup 252$Cf fission fragments and alpha particles

Description: Rates of atom displacement and helium injection in materials exposed to $sup 252$Cf fission fragments and alpha particles were calculated to establish the potential for use of $sup 252$Cf sources for radiation damage studies. Maximum displacement rates of about 10$sup -6$ dpa/sec at the surface of typical targets exposed to a $sup 252$Cf fission fragment source were comparable to those experienced by materials in a fast breeder reactor or in a controlled thermonuclear reactor (CTR) first wall, … more
Date: January 1, 1975
Creator: Gould, T. H., Jr. & McDonell, W. R.
Partner: UNT Libraries Government Documents Department
open access

Radiation blistering of Nb implanted sequentially with helium ions of different energies (3-500 keV)

Description: Cold rolled, polycrystalline niobium samples were irradiated at room temperature with $sup 4$He$sup +$ ions sequentially at 14 different energies over an energy range from 3 keV--500 keV in steps of 50 keV. The dose for each energy was chosen to give an approximately uniform concentration of helium between the implant depths corresponding to 3 keV and 500 keV. In one set of experiments the irradiations were started at the Kurchatov Institute with 3 keV $sup 4$He$sup +$ ions and extended up to 8… more
Date: January 1, 1976
Creator: Guseva, M. I.; Gusev, V.; Krasulin, U. L.; Martinenko, U. V.; Das, S. K. & Kaminsky, M. S.
Partner: UNT Libraries Government Documents Department
open access

Pacific Northwest Laboratory report on controlled thermonuclear reactor technology, January 1975 - September 1975

Description: The PNL staff has been studying fusion technology in areas such as economics, fusion-fission hybrid concepts, materials, neutronics, environment and safety. These studies have been scoped to make efficient use of ERDA resources, and to complement and support efforts at other laboratories. The effect the plasma and associated radiation and emission will have upon the surfaces of the first wall are being studied. Neutron sputtering experiments were made on niobium and gold and the results were ev… more
Date: October 1, 1975
Partner: UNT Libraries Government Documents Department
open access

Analysis of radiation damage in fusion-simulation neutron spectra

Description: Various parameters which are relevant to an understanding of radiation effects in metals have been evaluated utilizing available neutron spectrum information for several existing sources, e.g., EBRII, HFIR, and LAMPF, as well as the hypothetical spectrum at a fusion reactor first wall, and measured Li(d,n) spectra. Recoil energy distributions were calculated for several metals including Al, Cu, and Nb. The recoil energy range was divided into groups, and the fraction of recoils occurring in eac… more
Date: January 1, 1975
Creator: Parkin, D.M. & Goland, A.N.
Partner: UNT Libraries Government Documents Department
open access

Characteristics of 15 MeV and fission neutron damage in niobium

Description: Displacement damage by 15 MeV (d-Be source) and fission neutrons at 30$sup 0$C in high purity niobium single crystals has been studied by transmission electron microscopy. The fluence of the 15 MeV neutrons was 1.5-- 2.0 x 10$sup 17$ n/cm$sup 2$ and the fluence of the fission neutrons (5 x 10$sup 17$ n/cm$sup 2$) was chosen so that samples from both types of irradiations had approximately the same damage energy. In both 15 MeV and fission neutron irradiated specimens, the loops were observed to… more
Date: February 1, 1976
Creator: Narayan, J. & Ohr, S. M.
Partner: UNT Libraries Government Documents Department
Back to Top of Screen