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Instrumentation for neutron emission spectrometry in use at JET
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.
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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2010 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 623, no 2, 681-685 p.Article in journal (Refereed) Published
Abstract [en]

The present contribution discusses two neutron spectrometers: the time-of-flight spectrometer (TOFOR) and the magnetic proton recoil spectrometer (MPRu). TOFOR uses fast plastic scintillators equipped with digital time-stamping electronics to register the time of each eligible scintillation event. The time trace for each detector is acquired practically dead-time free. The detectors of the MPRu are of phoswich type and each detector is connected to a digital transient recorder card that stores the full waveform for an event. By using phoswich detectors, pulse-shape discrimination techniques can be applied offline to distinguish signal events from background. A future upgrade of TOFOR could be digital “hybrid” cards, which store correlated time and waveform information. This information can be used to decrease the background level in the ttof spectrum, thereby increasing the operating range.

Place, publisher, year, edition, pages
2010. Vol. 623, no 2, 681-685 p.
Keyword [en]
Fusion diagnostic, Neutron emission spectrometry, MPRu, TOFOR, Data acquisition systems
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-121517DOI: 10.1016/j.nima.2010.02.255ISI: 000284343600010OAI: oai:DiVA.org:uu-121517DiVA: diva2:305543
Available from: 2010-03-24 Created: 2010-03-24 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Neutron Spectrometry Techniques for Fusion Plasmas: Instrumentation and Performance
Open this publication in new window or tab >>Neutron Spectrometry Techniques for Fusion Plasmas: Instrumentation and Performance
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Neutron are emitted from a deuterium plasma with energies around 2.5 MeV. The neutron spectrum is intimately related to the ion velocity distribution of the plasma. As a consequence, the analysis of neutron energy spectra can give information of the plasma rotation, the ion temperature, heating efficiency and fusion power.

The upgraded magnetic proton recoil spectrometer (MPRu), based on the thin-foil technique, is installed at the tokamak JET. The upgrade of the spectrometer was done to allow for measurements of deuterium plasmas. This thesis describes the hardware, the data reduction scheme and the kind of fusion plasma parameters that can be estimated from the data of the MPRu. The MPRu data from 3rd harmonic ion cyclotron resonance and beam heating are studied.

Other neutron spectrometer techniques are reviewed as well, in particular in the aspect of suitability for neutron emission spectrometry at ITER. Each spectrometer technique is evaluated using synthetic data which is obtained from standard scenarios of ITER. From this evaluation, we conclude that the thin-foil technique is the best technique to measure, e.g., the ion temperature in terms of time resolution.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2010. 70 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 726
Keyword
fusion, plasma diagnostics, neutron spectrometry, neutron spectroscopy, MPRu, magnetic proton recoil spectrometer, fusion, ITER
National Category
Subatomic Physics
Research subject
Physics with specialization in Applied Nuclear Physics
Identifiers
urn:nbn:se:uu:diva-121615 (URN)978-91-554-7767-7 (ISBN)
Public defence
2010-05-12, Häggsalen, Angstrom Laboratory, Lägerhyddsvägen 1, Uppsala, 10:15 (English)
Opponent
Supervisors
Available from: 2010-04-20 Created: 2010-03-25 Last updated: 2011-01-12Bibliographically approved

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Applied Nuclear PhysicsDepartment of Physics and Astronomy
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Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Physical Sciences

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