Diagnosis of energetic ions and ion composition in fusion plasmas by collective Thomson scattering of mm-waves

Henrik Bindslev, Søren Bang Korsholm, Frank Leipold, Fernando Meo, Poul Michelsen, Stefan Kragh Nielsen, Mirko Salewski, Morten Stejner Pedersen

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsResearchpeer-review

Abstract

In fusion plasmas, the dominant heating source will be fusion generated energetic ions slowing down in the plasma. The same ions can also drive waves and instabilities in the plasma. Their distribution in velocity and in space has major impact on plasma dynamics, and plasma dynamics in turn affects the energetic ion distributions. The dynamics of energetic ions is thus important to measure in order to understand fusion plasmas, and important to monitor as part of input to plasma control. The collective Thomson scattering of millimeter waves has proven to be a valuable means of diagnosing energetic ion distributions in fusion plasmas1,2. A beam of mm-waves with a diameter of 5–10 cm and a power of 150–600 kW is sent through the plasma, and radiation scattered from this probe beam by the microscopic fluctuations in the plasma is detected. These microscopic fluctuations are in part induced by the ion motion and the fluctuations and hence the scattered radiation is thus sensitive to the ion distribution. This permits the fast ion distribution to be inferred from the detected scattered radiation. Dynamics of the fast ions is measured, and phenomena related to plasma instabilities observed.
Original languageEnglish
Title of host publication2012 Abstracts IEEE International Conference on Plasma Science (ICOPS)
PublisherIEEE
Publication date2012
Pages7C-10
DOIs
Publication statusPublished - 2012
Event2012 39th IEEE International Conference on Plasma Science (ICOPS) - Edinburgh International Conference Centre, Edinburgh, United Kingdom
Duration: 8 Jul 201213 Jul 2012

Conference

Conference2012 39th IEEE International Conference on Plasma Science (ICOPS)
LocationEdinburgh International Conference Centre
CountryUnited Kingdom
CityEdinburgh
Period08/07/201213/07/2012

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