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TRANSP modelling of experimentally measured fast particle redistribution and losses on MAST
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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2013 (English)Conference proceedings (editor) (Other academic)
Abstract [en]

MAST is a mid-size spherical tokamak with BT = 0.3-0.6 T and two NBI systems delivering up to 3.5 MW of super-Alfvénic deuterons and therefore suitable for understanding the dynamics of fast particles in ITER-relevant scenarios. It is well known that MHD instabilities can cause redistribution and/or losses of fast ions as observed in many tokamaks (such as NSTX, TFTR, DIII-D, JET, ASDEX, NSTX and MAST). In particular, on MAST, the effect of fast particle driven instabilities, such as fishbones and long-lived modes upon the total neutron yield measured by fission chamber (FC) and the neutron count rates measured by Neutron Camera (NC) has been observed [1]. Fishbones are characterized by burst-like behaviour observed in magnetic and SXR diagnostics and by the sweeping of the mode frequency during a burst. The resonant interaction between the toroidal and poloidal motion of the fast ions in the plasma with the n = 1, m = 1 internal kink mode is the mechanism responsible for driving the fishbone instability [2].

Place, publisher, year, edition, pages
010 Publishers, 2013.
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:uu:diva-275193OAI: oai:DiVA.org:uu-275193DiVA: diva2:899182
Conference
40th EPS Conference on Plasma Physics, Espoo, Finland, 1-5 July, 2013
Available from: 2016-02-01 Created: 2016-02-01 Last updated: 2016-05-12
In thesis
1. Modelling and Measurements of MAST Neutron Emission
Open this publication in new window or tab >>Modelling and Measurements of MAST Neutron Emission
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Measurements of neutron emission from a fusion plasma can provide a wealth of information on the underlying temporal, spatial and energy distributions of reacting ions and how they are affected by a wide range of magneto-hydro-dynamic (MHD) instabilities.

This thesis focuses on the interpretation of the experimental measurements recorded by neutron flux monitors with and without spectroscopic capabilities installed on the Mega Ampere Spherical Tokamak (MAST). In particular, the temporally and spatially resolved measurements of the neutron rate measured by the neutron camera, which also possesses spectroscopic capabilities, are combined with the temporally resolved measurements of the total neutron rate provided by the absolutely calibrated fission chamber in order to study the properties of the fast ion distributions in different plasma scenarios.

The first part of the thesis describes in detail the two forward modelling methods, which employ the set of interconnected codes developed to interpret experimental observations such as neutron count rate profiles and recoil proton pulse height spectra provided by the neutron camera. In the second part of the thesis the developed methods are applied to model the neutron camera observations performed in a variety of plasma scenarios. The first method, which involves only TRANSP/NUBEAM and LINE2 codes, was used to validate the neutron count rate profiles measured by the neutron camera in three different plasma scenarios covering the wide range of total neutron rate typically observed on MAST. In addition, the first framework was applied to model the changes in the total and local neutron rates caused by fishbone instability as well as to estimate the Hydrogen and Deuterium ion ratio. The second modelling method, which involves TRANSP/NUBEAM, LINE2, DRESS and NRESP, was used to validate the measured recoil proton pulse height spectra in a MHD-quiescent plasma scenario.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2016. 75 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1364
Keyword
fusion, plasma diagnostics, neutron emissivity and rate, Neutron Camera, tokamak, MAST
National Category
Fusion, Plasma and Space Physics
Research subject
Physics with specialization in Applied Nuclear Physics
Identifiers
urn:nbn:se:uu:diva-282122 (URN)978-91-554-9541-1 (ISBN)
Public defence
2016-05-26, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15 (English)
Opponent
Supervisors
Available from: 2016-05-04 Created: 2016-04-02 Last updated: 2016-05-12

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Wodniak, Iwona

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