Effects of low-temperature fusion neutron irradiation on critical properties of a monofilament niobium-tin superconductor (open access)

Effects of low-temperature fusion neutron irradiation on critical properties of a monofilament niobium-tin superconductor

The objective of this work was to irradiate a Nb/sub 3/Sn superconductor with 14.8 MeV neutrons at 4 K and measure critical current in transverse fields of up to 12 T, irradiating up to a fluence sufficient to decrease the critical current to below its initial value. Critical temperatures were also to be measured. The samples were to be kept near 4 K between the irradiation and the measurement of critical properties. This work is directed toward establishing an engineering design fluence limit for Nb/sub 3/Sn when used in fusion reactor superconducting magnets.
Date: March 22, 1984
Creator: Guinan, M.W.; Van Konynenburg, R.A. & Mitchell, J.B.
System: The UNT Digital Library
Lawrence Livermore National Laboratory search and property protection programs -- March 22, 1984 (open access)

Lawrence Livermore National Laboratory search and property protection programs -- March 22, 1984

On November 30, 1983, the LLNL Directorate met to discuss Laboratory policy regarding searches. An advance package (dated November 16, 1983) discussing background issues and DOE`s property protection and safeguards concerns was distributed to the Director and Associate Directors. A number of Associate Directors expressed concern about the nature of the theft problem at the Laboratory. There was also discussion about many employees` perception that Laboratory Management (including the Security Department) really did not care. The Director endorsed the need to establish searches in the SNM areas. The property protection type of searches were perceived as being very sensitive from a labor relations perspective. Nevertheless, the Directorate was sufficiently concerned about the safeguards and property protection issues to request the Security Department to develop a search plan for their review. A draft Search Program was prepared by the Security Department and reviewed individually with the Directorate for their comments. On March 19, 1984, the Directorate met collectively to consider a summary of these individual comments and to finalize a Search Program. Decisions made during that meeting have been incorporated into this document. This plan describes the search procedures that will be implemented at SNM areas and a two point program …
Date: March 22, 1984
Creator: Leary, D.A.
System: The UNT Digital Library