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Neutron Emission from Beam-Injected Fast Tritons in JET Plasmas with Reversed or Monotonic Magnetic Shear.
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Neutron Research. Department of Physics and Astronomy, Applied Nuclear Physics.
Department of Physics and Astronomy, Applied Nuclear Physics.
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2004 (English)In: 31st EPS Conference on Plasma Physics, 2004, 4- p.Conference paper, Published paper (Other scientific)
Abstract [en]

The neutron emission from fast tritons in plasmas with different magnetic shear

configurations has been investigated in a dedicated experiment on JET. Short pulses of

neutral beam injection were used to deposit fast tritons in deuterium plasmas. By comparing

the measured neutron yield with predictions based on DT reaction calculations, fast triton

losses can be assessed. The latter are expected to be very low according to neoclassical

predictions based on Fokker-Planck simulation [1]. Much larger “anomalous” beam-ion

losses (up to 40%) have been reported in TFTR experiments for plasma conditions with

reversed magnetic shear [2]. The TFTR experiments indicated an excess DT rate in the

simulation and, to a lesser extent, in the DD rate and plasma stored energy. This was

interpreted as anomalous beam-ion loss associated with reverse shear due to an unidentified

loss mechanism. Evidence of a similar effect was searched for in the JET experiments

reported in this paper.

Place, publisher, year, edition, pages
2004. 4- p.
Keyword [en]
nuclear fusion, neutron emission, neutron spectroscopy, MPR neutron spectrometer, DD reactions, DT reactions, heated plasma populations
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:uu:diva-71144OAI: oai:DiVA.org:uu-71144DiVA: diva2:99055
Available from: 2006-02-21 Created: 2006-02-21 Last updated: 2017-01-25

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http://eps2004.clf.rl.ac.uk/pdf/P1_156.pdf

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Källne, JanConroy, SeanEricsson, GöranGiacomelli, LucaHjalmarsson, AndersSjöstrand, HenrikWeiszflog, Matthias

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Källne, JanConroy, SeanEricsson, GöranGiacomelli, LucaHjalmarsson, AndersSjöstrand, HenrikWeiszflog, Matthias
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Department of Neutron ResearchApplied Nuclear Physics
Fusion, Plasma and Space Physics

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