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Performance of the AFS vertex detector at the CERN ISR

Description: The central detector of the Axial Field Spectrometer (AFS) is a cylindrical drift chamber using a bicycle-wheel geometry. Its design has been optimized for jet-like events with high track densities. This is accomplished through a high degree of azimuthal segmentation (4/sup 0/ sectors) with up to 42 space points per track, using measurements of drift time and charge division. Particle identification in the non-relativistic region is obtained by (dE/dx) sampling. The detector is operated in an inhomogeneous magnetic field at event rates of typically 5 x 10/sup 5/ collisions per second. Preliminary results will be presented on the detector performance achieved after one year of operation at the ISR.
Date: April 28, 1981
Creator: Botner, O.; Burkert, V. & Cockerill, D.
Partner: UNT Libraries Government Documents Department

Fusion Forum 1981

Description: This review covers the basics of the fusion process. Some research programs and their present status are mentioned. (MOW)
Date: July 28, 1981
Creator: Fowler, T.K.
Partner: UNT Libraries Government Documents Department

Water simulation of sodium reactors

Description: The thermal hydraulic simulation of a large sodium reactor by a scaled water model is examined. The Richardson Number, friction coefficient and the Peclet Number can be closely matched with the water system at full power and the similarity is retained for buoyancy driven flows. The simulation of thermal-hydraulic conditions in a reactor vessel provided by a scaled water experiment is better than that by a scaled sodium test. Results from a correctly scaled water test can be tentatively extrapolated to a full size sodium system.
Date: June 28, 1981
Creator: Grewal, S.S. & Gluekler, E.L.
Partner: UNT Libraries Government Documents Department

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 nuclei with high angular momentum. The data acquisition system is described. (WHK)
Date: May 28, 1981
Creator: Hensley, D.C.
Partner: UNT Libraries Government Documents Department

Neutron cross sections and Doppler effect of the 1. 056 eV resonance in /sup 240/Pu

Description: /sup 240/Pu possesses a value for the dilute resonance capture integral that is mostly due to the resonance at 1.056 eV. It is important to the neutron economy of a reactor to know the accurate size of the resonance, i.e., GAMMA/sub n/ and GAMMA/sub ..gamma../. The HFBR fast chopper facility has been used to make a determination of these resonance parameters. In this low energy region the intensity and resolution of the instrument are adequate for precise measurements.
Date: September 28, 1981
Creator: Liou, H.I. & Chrien, R.E.
Partner: UNT Libraries Government Documents Department

Design of a materials testing experiment for the INTOR

Description: The United States, Japan, USSR and the European community are jointly participating in the design of an International Tokamak Reactor called INTOR. In support of the US contribution to the INTOR design, the features of an experiment for bulk neutron irradiation damage studies were developed. It is anticipated that materials testing will be an important part of the programmatic mission of INTOR and consequently the requirements for materials testing in INTOR must be identified early in the reactor design to insure compatibility. The design features of the experiment, called a Channel Test, are given in this paper. The major components of the channel test are the water cooled heat sink (channel module) and the specimen capsule. The temperature within each of the 153 specimen capsules is predetermined by engineering the thermal barrier between the specimen capsule and heat sink. Individual capsules can be independently accessed and are designed to operate at a predetermined temperature within the range of 50 to 700/sup 0/C. The total irradiation volume within a single channel test is 45 liters. Features of the channel test that result in experimental versatility and simplified remote access and handling are discussed.
Date: August 28, 1981
Creator: Vogel, M.A. & Opperman, E.K.
Partner: UNT Libraries Government Documents Department