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- Gorini, G., et al.
(author)
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Nuclear scattering effects on the neutron emission in fusion plasmas
- 2008
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In: Few-body systems. - : Springer Science and Business Media LLC. - 0177-7963 .- 1432-5411. ; 44:1-4, s. 57-60
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Journal article (peer-reviewed)abstract
- Ion reactions and elastic scatterings in fusion plasmas of H and He nuclides are discussed as they can be observed in the neutron emission spectrum (NES). New calculations are presented on radio-frequency driven multi-step processes in (HeD)-He-3 plasmas involving knock-on scattering whose relative importance is discussed besides use for new plasma studies.
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| 5. |
- Gorini, G, et al.
(author)
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Relationship between neutron yield rate of tokamak plasmas and spectrometer measured flux for different sight lines
- 2011
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In: Review of Scientific Instruments. - : AIP Publishing. - 0034-6748 .- 1089-7623. ; 82:3, s. 033507-
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Journal article (peer-reviewed)abstract
- A parametric relationship between total neutron yield rate and collimated fluxes related to the brightness (B) of plasma chords (lambda) is developed for different emissivity distributions of tokamak plasmas. Specifically, the brightness was expressed as a function of chord coordinates of radial position using a simple model for the emissivity profiles of width parameter w. The functional brightness dependence B(lambda,w) was calculated to examine the relationship between measured flux and deduced yield rate, and its plasma profile dependence. The results were used to determine the chord range of minimum profile sensitivity in order to identify the preferred collimator sight for the determination of yield rate from neutron emission spectroscopy (YNES) measurements. The YNES method is discussed in comparison to conventional methods to determine the total neutron yield rates and related plasma fusion power relying on uncollimated flux measurements and a different calibration base for the flux-yield relationship. The results have a special bearing for tokamaks operating with both deuterium and deuterium-tritium plasmas and future high power machines such as for ITER, DEMO, and IGNITOR.
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- Ognissanto, F., et al.
(author)
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Line integration effects on ion temperatures in tokamak plasmas measured with neutron emission spectroscopy
- 2008
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In: Review of Scientific Instruments. - : AIP Publishing. - 0034-6748 .- 1089-7623. ; 79:10, s. 10E511-
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Journal article (peer-reviewed)abstract
- The line integrated line emission measured by neutron spectrometers at JET along sight lines in the vertical and horizontal planes has been simulated in Monte Carlo calculations to determine the relationship between the measured (effective) ion temperature (T-eff) relative to the peak value of the profile (T-0). The general sight line dependence of (T-eff) was expressed analytically for circular plasmas which was used to explain the simulated results for the actual JET sight lines. The analytical model with parametrization of sight lines and plasma profiles is described and the results are used to discuss dual sight line measurements that can be tested at JET and its forward implications for study burning (nearly thermal) plasmas of ITER.
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| 8. |
- Ognissanto, F, et al.
(author)
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The elastic He-3+d cross section of relevance for knock-on effects in radio frequency heated (He-3)D plasmas
- 2011
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In: Nuclear Instruments and Methods in Physics Research Section B. - : Elsevier BV. - 0168-583X .- 1872-9584. ; 269:8, s. 786-792
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Journal article (peer-reviewed)abstract
- The cross section for d+He-3 elastic scattering has been determined for the angular range 20-180 degrees (CM) for beam energies E-d = 0.05 to 11 MeV through combined use of experimental data, Coulomb scattering and extrapolations. The results are used to study, for instance, how the cross section is affected by nuclear interaction contributions. Implications of these results on the calculation of knock on effects in (He-3)D plasmas subjected to RF heating and their manifestations in the spectrum of the d + d fusion neutron emission are discussed.
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