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Sunday, August 2, 2020 | History

3 edition of Macroscopic cross section sensitivity study for fusion reactor shielding experiments found in the catalog.

Macroscopic cross section sensitivity study for fusion reactor shielding experiments

Oak Ridge National Laboratory. Engineering Physics Division.

Macroscopic cross section sensitivity study for fusion reactor shielding experiments

by Oak Ridge National Laboratory. Engineering Physics Division.

  • 28 Want to read
  • 20 Currently reading

Published by Dept. of Energy, [Office of the Assistant Secretary for Energy Technology], Oak Ridge National Laboratory, for sale by the National Technical Information Service in Oak Ridge, Tenn, Springfield, Va .
Written in English

    Subjects:
  • Fusion reactors,
  • Shielding (Radiation) -- Problems, exercises, etc

  • Edition Notes

    StatementY. Seki ... [et al]
    SeriesORNL ; 5467
    ContributionsSeki, Y. 1943-
    The Physical Object
    Paginationv, 37 p. :
    Number of Pages37
    ID Numbers
    Open LibraryOL14881190M

      Here we demonstrate the feasibility of using large-area neutron detectors for monitoring nuclear reactors at stand-off distances up to m outside reactor shielding, as a potential reactor. Nuclear fusion, process by which nuclear reactions between light elements form heavier elements (up to iron). In cases where the interacting nuclei belong to elements with low atomic numbers (e.g., hydrogen [atomic number 1] or its isotopes deuterium and tritium), substantial amounts of energy are released. The vast energy potential of nuclear fusion was first exploited in thermonuclear.

    Photoelectric effect with photons from visible spectrum on potassium plate – threshold energy – 2eV. Each photon above a threshold frequency (specific for each material) has the needed energy to eject a single electron, creating the observed in’s theory predicts that the maximum kinetic energy of emitted electron is dependent only on the frequency of the incident light and. This was a coupled neutron, gamma-ray cross-section library with the design goal of sensitivity tests in shielding calculations. The second version is a library of cross sections for neutron and 20 gamma-ray groups and was named EURLIB-III. It contains cross sections for 14 materials and is based on ENDF/B-IV data. 5. APPLICATION OF THE DATA.

    High confinement is needed for plasma fusion • Our goal: get the required temperature with the least amount of heating power • Energy confinement time is the ratio of stored energy to heating rate. • In a fusion reactor that heat would come from the fast a particles (charged, so they are confined by the magnetic field) E. Studies have been carried out to obtain new materials that have good shielding properties for both neutrons and gamma rays. The most effective shielding material for nuclear reactors is probably obtained by mixing hydrogenous materials, heavy metals, and thermal neutron absorbers.


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Macroscopic cross section sensitivity study for fusion reactor shielding experiments by Oak Ridge National Laboratory. Engineering Physics Division. Download PDF EPUB FB2

Get this from a library. Macroscopic cross section sensitivity study for fusion reactor shielding experiments. [Y Seki; Oak Ridge National Laboratory.

Engineering Physics Division.]. A macroscopic cross-section is derived from microscopic cross-section and the atomic number density. Σ=σ.N. Here σ, which has units of m 2, is the microscopic the units of N (nuclei density) are nuclei/m 3, the macroscopic cross-section Σ have units of m-1, thus in fact is an incorrect name, because it is not a correct unit of cross-sections.

Detail design of the shielding blanket protecting the peripherals, more especially the super-conducting coils, is well advanced. A cross-section uncertainty study, i.e. a study of the expected inaccuracy due to the nuclear cross-section data, has been done for the neutron-gamma reactions in the insulation of the coils for such a by: 2.

The evaluated cross-section data are selected from the available nuclear data sources like ENDF, JENDL, and JEFF.

The resonance cross-section, self-shielding, thermal neutron scattering, and Doppler effect on temperature are included as a physical effect : C. Danani, H.L. Swami.

ORNL CROSS-SECTION SENSITIVITY ANALYSIS APPLICATIONS FOR RADIATION SHIELDING* D. Bartine,a F. Mynatt,a E. Oblow,a R. Childs, J. Pace,b w. Engle, a J. Knight,b and T.

Sims c ABSTRACT A review of the progress in cross-section sensitivity analysis of radia tion shielding problems is : D.E. Bartine, F.R. Mynatt, E.M. Oblow, R.L. Childs, J.V. Pace, W.W. Engle, J.R. Knight, T.M.

Sims. Cross section sensitivity analysis of a proposed streaming experiment for a typical penetration in a fusion reactor shield has been performed using a two-dimensional sensitivity method. Table ated relative uncertainties (Δ R R) of the total nuclear heating due to the total, elastic, inelastic and (n, γ) cross section of Fe, Cr and Ni in three zones of the shield (left part of the table) (n.a.

= not analysed).In the right part of the table the extrapolated values of (Δ R R) total for the complete shield are given. In the column indicated by ∑ uncorr the summed. Experiments directed toward developing fusion power are invariably done with dedicated machines which can be classified according to the principles they use to confine the plasma fuel and keep it hot.

The major division is between magnetic confinement and inertial magnetic confinement, the tendency of the hot plasma to expand is counteracted by the Lorentz force between. The macroscopic cross section (Σ) takes into account the number of those nuclides present The microscopic cross section is measured in units of barns (b): 1 barn equals 10 cm2 = m2.

Cross Section Hierarchy. Pillon, Erice school on Fusion Reactor Tecnology,26July-1 August, NEUTRON CROSS SECTIONS cont. experiments. Santoro's research works with citations and reads, including: The SNS Target Station Preliminary Title I Shielding Analyses.

1. Introduction. In some nuclear reactors, the cross-sections of absorption and fission in resonance energy region for some main fertile/fissile materials become very high, which can cause sharp dips in the flux corresponding to each resonance region, making the spectrum deviate from the standard spectrum C(E).The deviation of spectrum may result in inaccuracy of the group cross-sections.

The fast-neutron shielding behaviour (FNSB) of two clay-materials (Ball clay and Kaolin)of Southwestern Nigeria (°N, °E) have been investigated using effective removal cross section. Macroscopic cross section sensitivity study for fusion reactor shielding experiments macroscopic cross sections for neutron interactions in materials used in an integral experiment for fusion.

Nuclear fusion - Nuclear fusion - Energy released in fusion reactions: Energy is released in a nuclear reaction if the total mass of the resultant particles is less than the mass of the initial reactants.

To illustrate, suppose two nuclei, labeled X and a, react to form two other nuclei, Y and b, denoted X + a → Y + b. The particles a and b are often nucleons, either protons or neutrons, but. Macroscopic Cross-section.

The difference between the microscopic cross-section and macroscopic cross-section is very important and is restated for clarity. The microscopic cross section represents the effective target area of a single target nucleus for an incident particle. The units are given in barns or cm While the macroscopic cross-section represents the effective target area of all.

Artificial Isotopes of Uranium. The main artificial isotopes, which have to be considered in the fuel cycle of all commercial light water reactors, are: U. U belongs to the group of fissile is produced by neutron radiative capture in nuclear reactors containing thorium fuel.

2; U. U is neither a fissile isotope, nor a fertile isotope. This study should be useful for design of effective shielding using hydrides and borohydrides metals in fusion reactors. Discover the world's research 17+ million members. Radiation Shielding for Fusion Reactors R. Santoro Oak Ridge National Laboratory Oak Ridge, TN USA Cross-Section of a Tokamak Reactor l energy release distributions, l sources of residual radioactivity and One of the design requirements for ITER was that l sensitivity analysis.

Total Cross-section. In general, nuclear cross-sections can be measured for all possible interaction processes together, in this case they are called total cross-sections (σ t).The total cross section is the sum of all the partial cross sections such as: elastic scattering cross-section (σ s); inelastic scattering cross-section (σ i); absorption cross-section (σ a).

After having worked on nuclear fusion experiments for 25 years at the Princeton Plasma Physics Lab, I began to look at the fusion enterprise more dispassionately in my retirement. I concluded that a fusion reactor would be far from perfect, and in some ways close to. k eff reactor is lower than this case, the production of all neutrons is insufficient to balance neutron losses and the chain reaction is not self-sustaining.

If the reactor core contains external or internal neutron sources, the reactor is in the state that is usually referred to as the subcritical multiplication. Fusion devices, particularly tokamak reactors, are complicated by geometry constraints that complicate disposition of fully effective shielding.

This paper reviews some of these shielding issues and suggested solutions for optimizing the machine and biological shielding. Radiation transport calculations are essential for predicting and.Fusion reactor, also called fusion power plant or thermonuclear reactor, a device to produce electrical power from the energy released in a nuclear fusion reaction.

The use of nuclear fusion reactions for electricity generation remains theoretical. Since the s, scientists have known that the Sun and other stars generate their energy by nuclear fusion.