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

The effect of ion cyclotron resonance heating (ICRH) on ((3)He)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 (3)He concentrations (X((3)He)>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((3)He) 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((3)He) 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
Fusion, Plasma and Space Physics
URN: urn:nbn:se:kth:diva-24656DOI: 10.1063/1.2965009ISI: 000260573500096ScopusID: 2-s2.0-55349135206OAI: diva2:352517
17th Topical Conference on High-Temperature Plasma Diagnostics, Albuquerque, NM, 2008

QC 20101119

Available from: 2010-09-21 Created: 2010-09-21 Last updated: 2014-04-08Bibliographically approved

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Johnson, Thomas J.
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