Techniques for measuring the alpha-particle distribution in magnetically confined plasmas PDF Download
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Author: Princeton University. Plasma Physics Laboratory
Publisher:
ISBN:
Category : Alpha rays
Languages : en
Pages : 52
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Book Description
Author: Princeton University. Plasma Physics Laboratory
Publisher:
ISBN:
Category : Alpha rays
Languages : en
Pages : 52
Get Book Here
Book Description
Author: Princeton University. Plasma Physics Laboratory
Publisher:
ISBN:
Category : Alpha rays
Languages : en
Pages : 52
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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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.
Author: Mietek Lisak
Publisher:
ISBN:
Category : Alpha rays
Languages : en
Pages : 196
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Author:
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Category :
Languages : en
Pages :
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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.
Author: Mietak Lisak
Publisher:
ISBN:
Category :
Languages : en
Pages : 178
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Author:
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Category :
Languages : en
Pages :
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We discuss a method of measuring the velocity distribution of confined energetic alpha particles resulting from deuterium-tritium fusion reactions in a magnetically contained plasma. We calculate the characteristics of the signals to be expected from injecting multi-MeV Li° into the plasma to undergo double charge-exchange reactions with the alpha particles. Neutralized alpha particles then escape from the plasma to be detected by a charge-exchange analyzer. We also examine the feasibility of producing a Li° beam of the required current and energy, and we discuss a conceptual design for an appropriate beam system.
Author:
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ISBN:
Category : Power resources
Languages : en
Pages : 464
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 426
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Author: S. J. Zweben
Publisher:
ISBN:
Category : Alpha rays
Languages : en
Pages : 22
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