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Neutron emission spectroscopy results for internal transport barrier and mode conversion ion cyclotron resonance heating experiments at JET
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
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2008 (English)In: Review of Scientific Instruments, ISSN 0034-6748, E-ISSN 1089-7623, Vol. 79, no 10, 10E514- p.Article in journal (Refereed) Published
Abstract [en]

The effect of ion cyclotron resonance heating (ICRH) on (He-3)D plasmas at JET was studied with the time of flight optimized rate (TOFOR) spectrometer dedicated to 2.5 MeV dd neutron measurements. In internal transport barrier (ITB) plasma experiments with large He-3 concentrations (X(He-3)>15%) an increase in neutron yield was observed after the ITB disappeared but with the auxiliary neutral beam injection and ICRH power still applied. The analysis of the TOFOR data revealed the formation of a high energy (fast) D population in this regime. The results were compared to other mode conversion experiments with similar X(He-3) but slightly different heating conditions. In this study we report on the high energy neutron tails originating from the fast D ions and their correlation with X(He-3) and discuss the light it can shed on ICRH-plasma power coupling mechanisms.

Place, publisher, year, edition, pages
2008. Vol. 79, no 10, 10E514- p.
Keyword [en]
fusion reactors, plasma beam injection heating, plasma collision processes, plasma diagnostics, plasma radiofrequency heating, plasma toroidal confinement
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-149441DOI: 10.1063/1.2965009ISI: 000260573500096OAI: oai:DiVA.org:uu-149441DiVA: diva2:405017
Note
JET-EFDA Contributors. Conference Information: 17th Topical Conference on High-Temperature Plasma Diagnostics Albuquerque, NM, 2008Available from: 2011-03-20 Created: 2011-03-20 Last updated: 2017-12-11Bibliographically approved

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