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Neutron spectroscopy measurements and modeling of neutral beam heating fast ion dynamics
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
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2010 (English)In: Plasma Physics and Controlled Fusion, ISSN 0741-3335, E-ISSN 1361-6587, Vol. 52, no 8, 085013- p.Article in journal (Refereed) Published
Abstract [en]

The energy spectrum of the neutron emission from beam-target reactions in fusion plasmas at the Joint European Torus (JET) has been investigated. Different beam energies as well as injection angles were used. Both measurements and simulations of the energy spectrum were done. The measurements were made with the time-of-flight spectrometer TOFOR. Simulations of the neutron spectrum were based on first-principle calculations of neutral beam deposition profiles and the fast ion slowing down in the plasma using the code NUBEAM, which is a module of the TRANSP package. The shape of the neutron energy spectrum was seen to vary significantly depending on the energy of the beams as well as the injection angle and the deposition profile in the plasma. Cross validations of the measured and modeled neutron energy spectra were made, showing a good agreement for all investigated scenarios.

Place, publisher, year, edition, pages
2010. Vol. 52, no 8, 085013- p.
National Category
Physical Sciences Engineering and Technology
URN: urn:nbn:se:uu:diva-114446DOI: 10.1088/0741-3335/52/8/085013ISI: 000279709700013OAI: oai:DiVA.org:uu-114446DiVA: diva2:294069
Available from: 2010-02-16 Created: 2010-02-16 Last updated: 2016-04-18Bibliographically approved
In thesis
1. Diagnosing Fuel Ions in Fusion Plasmas using Neutron Emission Spectroscopy
Open this publication in new window or tab >>Diagnosing Fuel Ions in Fusion Plasmas using Neutron Emission Spectroscopy
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Neutron emission spectra, measured with the time of flight spectrometer TOFOR, at the joint European torus (JET) are presented in this thesis. TOFOR has been in use since 2005, routinely measuring the neutron emission from JET plasmas.

The work in the thesis mainly concerns the modeling of the signatures in the neutron spectrum that reveal different parts of the fuel ion distribution, such as the thermal bulk plasma as well as energetic ions from neutral beam and ion cyclotron heating. Parametric models of the signatures, using plasma parameters as input, are employed to generate trial neutron spectra. The parameters, such as the fuel ion temperature or the fast ion distribution function, are deduced by iteratively fitting the trial spectra to the measured data. Measurements with TOFOR have been made and the models were applied. The studies are mainly on neutrons from d(d, n)3 He reactions(DD), although the emission from reactions with the plasma impurity 9 Be and triton burn up is covered as well.

This has allowed for detailed studies of e.g. the physics ICRF heating as well as the interactions between energetic ions and plasma instabilities, such as toroidal Alfvé Eigenmodes.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2010. 87 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 716
fusion, plasma diagnostics, neutron spectroscopy, NBI heating, ICRF heating, energetic ions
National Category
Fusion, Plasma and Space Physics Subatomic Physics
Research subject
Applied Nuclear Physics
urn:nbn:se:uu:diva-114449 (URN)978-91-554-7727-1 (ISBN)
Public defence
2010-03-31, Häggsalen, Lägerhyddsvägen 1, Ångströmslaboratoriet, 10:15 (English)
Available from: 2010-03-10 Created: 2010-02-16 Last updated: 2010-03-10Bibliographically approved

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