Sökning: "neutron flux"

Visar resultat 1 - 5 av 49 avhandlingar innehållade orden neutron flux.

1. 1. Study of Collimated Neutron Flux Monitors for MAST and MAST Upgrade

   Författare :Siriyaporn Sangaroon; Göran Ericsson; Marco Cecconello; Matthias Weiszflog; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fusion; Plasma diagnostics; Neutron camera; collimated neutron flux monitor; MAST; MAST Upgrade; ITER; Applied Nuclear Physics; Tillämpad kärnfysik;

   Sammanfattning : Measurements of the neutron emission, resulting from nuclear fusion reactions between the hydrogen isotopes deuterium and tritium, can provide a wealth of information on the confinement properties of fusion plasmas and how these are affected by Magneto-Hydro-Dynamic (MHD) instabilities.This thesis describes work aimed to develop neutron measurement techniques for nuclear fusion plasma experiments, specifically regarding the performance and design of collimated neutron flux monitors (neutron cameras) for the Mega Ampere Spherical Tokamak, MAST, and for MAST Upgrade. LÄS MER

3. 2. A systematic study of methods to measure a neutron flux absolutely : use of a Ra-alpha-Be neutron source as a standard for the intercomparison of methods to measure a neutron flux

   Författare :Karl-Erik Larsson; Stockholms högskola; []
   Nyckelord :;

   Sammanfattning : .... LÄS MER

4. 3. Modelling and Measurements of MAST Neutron Emission

   Författare :Iwona Klimek; Marco Cecconello; Jozef Ongena; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; fusion; plasma diagnostics; neutron emissivity and rate; Neutron Camera; tokamak; MAST; Fysik med inriktning mot tillämpad kärnfysik; Physics with specialization in Applied Nuclear Physics;

   Sammanfattning : Measurements of neutron emission from a fusion plasma can provide a wealth of information on the underlying temporal, spatial and energy distributions of reacting ions and how they are affected by a wide range of magneto-hydro-dynamic (MHD) instabilities.This thesis focuses on the interpretation of the experimental measurements recorded by neutron flux monitors with and without spectroscopic capabilities installed on the Mega Ampere Spherical Tokamak (MAST). LÄS MER

5. 4. Benchmark of simulation of an ion guide for neutron-induced fission products

   Författare :Zhihao Gao; Andreas Solders; Johan Nyberg; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fission products; simulation; Geant4; GEF; MCNPX; neutron flux; gamma spectroscopy;

   Sammanfattning : Independent yield distributions of high-energy neutron-induced fission are of importance to achieve a good understanding of fission. Even though the mass and charge yield distributions of thermal neutron-induced fission are well known, there are few experimental data for high-energy neutron-induced fission. LÄS MER

7. 5. A Monitor for Neutron Flux measurements up to 20 MeV

   Författare :Angelica Hildebrand; Uppsala universitet; []
   Nyckelord :;

   Sammanfattning : .... LÄS MER