Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Fusion-product alpha particles will dominate the behavior of the next generation of ignited D-T fusion reactors. Advanced diagnostics will be required to characterize the energy deposition of these fast alpha particles in the magnetically confined plasma. For small-angle coherent Thomson scattering of a CO/sub 2/ laser beam from such a plasma, a resonance in the scattered power occurs near 90/sup 0/ with respect to the magnetic field direction. This spatial concentration permits a simplified detection of the scattered laser power from the plasma using a heterodyne system. The signal produced by the presence of fusion-product alpha particles in an ignited plasma is calculated to be well above the noise level, which results from statistical variations of the background signal produced by scattering from free electrons. 7 refs.
Feasibility of Alpha Particle Measurement in a Magnetically Confined Plasma by CO/sub 2/ Laser Thomson Scattering
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Fusion-product alpha particles will dominate the behavior of the next generation of ignited D-T fusion reactors. Advanced diagnostics will be required to characterize the energy deposition of these fast alpha particles in the magnetically confined plasma. For small-angle coherent Thomson scattering of a CO/sub 2/ laser beam from such a plasma, a resonance in the scattered power occurs near 90/sup 0/ with respect to the magnetic field direction. This spatial concentration permits a simplified detection of the scattered laser power from the plasma using a heterodyne system. The signal produced by the presence of fusion-product alpha particles in an ignited plasma is calculated to be well above the noise level, which results from statistical variations of the background signal produced by scattering from free electrons. 7 refs.
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Fusion-product alpha particles will dominate the behavior of the next generation of ignited D-T fusion reactors. Advanced diagnostics will be required to characterize the energy deposition of these fast alpha particles in the magnetically confined plasma. For small-angle coherent Thomson scattering of a CO/sub 2/ laser beam from such a plasma, a resonance in the scattered power occurs near 90/sup 0/ with respect to the magnetic field direction. This spatial concentration permits a simplified detection of the scattered laser power from the plasma using a heterodyne system. The signal produced by the presence of fusion-product alpha particles in an ignited plasma is calculated to be well above the noise level, which results from statistical variations of the background signal produced by scattering from free electrons. 7 refs.
Feasibility of Alpha Particle Measurement by CO/sub 2/ Laser Thomson Scattering
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The feasibility of O/sub 2/ laser Thomson scattering from a multicomponent burning plasma has been evaluated for the measurement of the velocity distribution of D-T produced alpha particles. The density and velocity distribution of the alpha particles from their initial energy of 3.5 MeV down to near-thermal energies may be measured by small angle (
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The feasibility of O/sub 2/ laser Thomson scattering from a multicomponent burning plasma has been evaluated for the measurement of the velocity distribution of D-T produced alpha particles. The density and velocity distribution of the alpha particles from their initial energy of 3.5 MeV down to near-thermal energies may be measured by small angle (
Feasibility of Alpha Particle Measurement by CO2 Laser Thomson Scattering
Author: R. K. Richards
Publisher:
ISBN:
Category :
Languages : en
Pages : 27
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 27
Book Description
Feasibility of Alpha Particle Measurement by CO2 Laser Thomson Scattering
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 17
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 17
Book Description
Optimization of a CO[sub 2] Laser Thomson Scattering Alpha Particle Diagnostic
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 21
Book Description
The optimization of a CO[sub 2] laser Thomson scattering system for measurement of the velocity distribution of fusion product alpha particles is studied. It is found that for the International Thermonuclear Experimental Reactor (ITER) plasma, the optimal system conditions are a 20-MW source laser and a receiver bandwidth of 15 GHz.
Publisher:
ISBN:
Category :
Languages : en
Pages : 21
Book Description
The optimization of a CO[sub 2] laser Thomson scattering system for measurement of the velocity distribution of fusion product alpha particles is studied. It is found that for the International Thermonuclear Experimental Reactor (ITER) plasma, the optimal system conditions are a 20-MW source laser and a receiver bandwidth of 15 GHz.
Scientific and Technical Aerospace Reports
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 964
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 964
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
The Role of Alpha Particles in Magnetically Confined Fusion Plasmas
Author: Mietek Lisak
Publisher:
ISBN:
Category : Alpha rays
Languages : en
Pages : 196
Book Description
Publisher:
ISBN:
Category : Alpha rays
Languages : en
Pages : 196
Book Description
Government Reports Annual Index
Author:
Publisher:
ISBN:
Category : Government reports announcements & index
Languages : en
Pages : 1592
Book Description
Publisher:
ISBN:
Category : Government reports announcements & index
Languages : en
Pages : 1592
Book Description
Energy Research Abstracts
Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 1162
Book Description
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 1162
Book Description
Techniques for Measuring the Alpha-particle Distribution in Magnetically Confined Plasmas
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Methods are proposed for measuring the alpha-particle distribution in magnetically confined fusion plasmas using neutral-atom doping beams, ultraviolet spectroscopy, and neutral particle detectors. In the first method single charge exchange reactions, A° + He/sup + +/ -> A (He)*, are used to populate the n=2 and n=3 levels of He+. The ultraviolet photons from the decaying excited states are Doppler shifted by 5 to 10 Angstroms from those produced by the thermalized alpha-particle ash. In the second method double charge exchange reactions, A° + He/sup + +/ -> A/sup + +/ + He°, enable fast neutralized alpha-particles to escape from the plasma and be detected by neutral particle analysers. Detector configurations are analyzed, count rates are estimated and their detectability is discussed. A preliminary analysis of the feasibility of the required neutral beams is presented, and exploratory experiments on existing devices are suggested.
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Methods are proposed for measuring the alpha-particle distribution in magnetically confined fusion plasmas using neutral-atom doping beams, ultraviolet spectroscopy, and neutral particle detectors. In the first method single charge exchange reactions, A° + He/sup + +/ -> A (He)*, are used to populate the n=2 and n=3 levels of He+. The ultraviolet photons from the decaying excited states are Doppler shifted by 5 to 10 Angstroms from those produced by the thermalized alpha-particle ash. In the second method double charge exchange reactions, A° + He/sup + +/ -> A/sup + +/ + He°, enable fast neutralized alpha-particles to escape from the plasma and be detected by neutral particle analysers. Detector configurations are analyzed, count rates are estimated and their detectability is discussed. A preliminary analysis of the feasibility of the required neutral beams is presented, and exploratory experiments on existing devices are suggested.