Search for dissertations about: "neutron detectors"

Showing result 11 - 15 of 61 swedish dissertations containing the words neutron detectors.

  2. 11. Development and Use of Neutron Scintillator Systems for Fusion Plasma Diagnostics

    Author : Magnus Hoek; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; organic scintillators; neutron spectrometry;

    Abstract : This thesis reports on research and development work, made in connection with the use of organic scintillators, for neutron spectrometry. It also gives a general review on the use of organic scintillators for the detection of neutrons generated from fusion of deuterium (D) and fusion between a mixture of deuterium and tritium (T) in thermonuclear plasmas. READ MORE

  4. 12. Making TOFu : Fusion Plasma Neutron Emission Spectrometry with a Fully Digital Data Acquisition System

    Author : Mateusz Skiba; Göran Ericsson; Anders Hjalmarsson; Carl Hellesen; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; fusion; plasma diagnostics; neutron spectrometry; TOFOR; tokamak; JET; digital data acquisition; Fysik med inriktning mot tillämpad kärnfysik; Physics with specialization in Applied Nuclear Physics;

    Abstract : TOFu (Time-Of-Flight upgrade) is a fully digital data acquisition system based on 1 GSPS, 12 bit digitisers for the TOFOR (Time-Of-Flight spectrometer Optimised for Rate) fusion neutron spectrometer at JET. The system has been assessed, developed and subsequently tested during experimental campaigns at JET. READ MORE

  5. 13. Novel Diagnostics and Computational Methods of Neutron Fluxes in Boiling Water Reactors

    Author : John Loberg; Michael Österlund; Thomas Smed; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Void; BWR; neutron fluxes; channel bow; MCNP; 2D 3D; Physics; Fysik;

    Abstract : The focus in this thesis is to improve knowledge of the BWR related uncertainties void, channel bow, and control rods. The presence of void determines the moderation of neutrons in BWRs. A high void fraction is less efficient in moderating neutrons than a low one. READ MORE

  6. 14. Order restricted inference over countable preordered sets. Statistical aspects of neutron detection

    Author : Vladimir Pastukhov; Matematisk statistik; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Constrained inference; Isotonic regression; Density estimation; Grenander estimator; Limit distribution; Neutron detection;

    Abstract : This thesis consists of four papers. In the first paper, we study the isotonic regression estimator over a general countable preordered set. We obtain the limiting distribution of the estimator and study its properties. Also, it is shown that the isotonisation preserves the rate of convergence of the underlying estimator. READ MORE

  7. 15. Development of a Numerical Tool for Estimating the Neutron Noise in Nuclear Reactors

    Author : Viktor Larsson; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; neutron noise; P1 theory; AnalyticalGreen’s function; Analytical Nodal Method; P1 theory; Finite Difference Method; Green’s function; diffusion theory; diffusion theory;

    Abstract : The neutron noise, i.e. the time-variations of the neutron flux around its meanvalue, can be used for obtaining important safety parameters in a nuclear reactor,e.g. READ MORE