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Validation of neutron emission profiles in MAST with a collimated neutron monitor
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.
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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2012 (English)In: Review of Scientific Instruments, ISSN 0034-6748, E-ISSN 1089-7623, Vol. 83, no 10, 10D910- p.Article in journal, Meeting abstract (Refereed) Published
Abstract [en]

A neutron camera with liquid scintillator detectors is used in MAST to measure the neutron emissivity from D(d,n) 3He reactions along collimated lines of sight. In this work, the measured recoil proton pulse height spectra generated in the detectors by the incident neutrons is modelled taking into account the energy spectrum of the generated neutrons, their spatial distribution and transport to the detectors as well as the detectors response function. The contribution of scattered neutrons to the pulse height spectrum is also modelled. Good agreement is found between the experimental data and the simulations. Examples are given showing the sensitivity of the recoil proton pulse height spectra to different observation angles with respect the neutral beam injection and the plasma rotation direction.

Place, publisher, year, edition, pages
2012. Vol. 83, no 10, 10D910- p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-186840DOI: 10.1063/1.4732059ISI: 000311562900098OAI: oai:DiVA.org:uu-186840DiVA: diva2:574830
Conference
THE 19TH TOPICAL CONFERENCE ON HIGH-TEMPERATURE PLASMA DIAGNOSTICS, May 6-10, 2012, Monterey, CA, USA
Available from: 2012-12-06 Created: 2012-11-29 Last updated: 2017-12-07Bibliographically approved
In thesis
1. Study of Collimated Neutron Flux Monitors for MAST and MAST Upgrade
Open this publication in new window or tab >>Study of Collimated Neutron Flux Monitors for MAST and MAST Upgrade
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Measurements of the neutron emission, resulting from nuclear fusion reactions between the hydrogen isotopes deuterium and tritium, can provide a wealth of information on the confinement properties of fusion plasmas and how these are affected by Magneto-Hydro-Dynamic (MHD) instabilities.

This thesis describes work aimed to develop neutron measurement techniques for nuclear fusion plasma experiments, specifically regarding the performance and design of collimated neutron flux monitors (neutron cameras) for the Mega Ampere Spherical Tokamak, MAST, and for MAST Upgrade. The first part of the thesis focuses on the characterization of a prototype neutron camera installed at MAST and provides an account of the very first measurements of the neutron emissivity along its collimated fields of view. It is shown that the camera has sufficient temporal and spatial resolution to measure the effect of MHD instabilities on the neutron emissivity. The neutron camera fulfils the requirement on the measurements of the neutron count rate profile with less than 10 % statistical uncertainty in a time resolution of 1 ms. The instrument's more rudimentary capabilities to provide information on the neutron energy distribution are also presented and discussed. The encouraging results obtained with the prototype neutron camera show the potential of a collimated neutron flux monitor at MAST and suggest that an upgraded instrument for MAST Upgrade will provide crucial information on fast ions behavior and other relevant physics issues.

The design of such an upgraded instrument for MAST Upgrade is discussed in the second part of the thesis. Two design options are explored, one consisting of two collimator arrays in the horizontal direction, another more traditional design with lines-of-sight in the poloidal cross section plane. On the basis of the experience gained with the prototype neutron camera and on the exploratory design and estimated performance for the upgraded camera presented here, a conceptual design of a neutron camera upgrade is proposed.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2014. 84 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1141
Keyword
Fusion, Plasma diagnostics, Neutron camera, collimated neutron flux monitor, MAST, MAST Upgrade, ITER
National Category
Fusion, Plasma and Space Physics
Research subject
Applied Nuclear Physics
Identifiers
urn:nbn:se:uu:diva-221591 (URN)978-91-554-8930-4 (ISBN)
Public defence
2014-05-27, Häggsalen, Ångströmlaboratoriet, Uppsala, 10:00 (English)
Supervisors
Available from: 2014-05-05 Created: 2014-04-02 Last updated: 2014-06-30

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Sangaroon, SiriyapornCecconello, MarcoConroy, SeanWeiszflog, MatthiasWodniak, IwonaEricsson, Göran

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