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Neutron spectrometry measurements of energetic deuterons in ICRF heated plasmas with the ITER-like wall 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, 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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2014 (English)In: 41th EPS Conference on Plasma Physics 2014 (EPS 2014): Europhysics Conference Abstracts, 2014Conference paper, Published paper (Other academic)
Abstract [en]

At JET, experiments have been conducted in order to optimize the performance of ion cyclotron radio-frequency (ICRF) heating in the presence of the newly installed ITER-like wall. The ICRF was tuned to the cyclotron frequency of minority hydrogen (H), which is also the 2nd harmonic of the cyclotron frequency of deuterium (D). The relative H concentration was varied from a few percent up to about 25 percent in a series of plasma discharges and the neutron time-of-flight spectrometer TOFOR was used to measure the energy spectrum of neutrons from the D(D,n)3He reaction during these discharges. It could be seen that the signal from ICRF accelerated deuterons depended strongly on H concentration. This observation indicates that the ICRF power absorbed by D at the 2nd harmonic cyclotron resonance increases with decreasing H concentration. This is in qualitative agreement with theoretical expectations obtained from the plasma wave equation solver TOMCAT.

Place, publisher, year, edition, pages
2014.
Keyword [en]
neutron spectrometry, radiofrequency heating
National Category
Fusion, Plasma and Space Physics
Research subject
Physics with specialization in Applied Nuclear Physics
Identifiers
URN: urn:nbn:se:uu:diva-234730OAI: oai:DiVA.org:uu-234730DiVA: diva2:757713
Conference
41st EPS Conference on Plasma Physics, Berlin 2014
Available from: 2014-10-23 Created: 2014-10-23 Last updated: 2016-01-25

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http://ocs.ciemat.es/EPS2014PAP/pdf/P1.023.pdf

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Eriksson, JacobBinda, FedericoConroy, SeanEricsson, GöranHellesen, CarlHjalmarsson, AndersSkiba, MateuszWeiszflog, Matthias

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Applied Nuclear Physics
Fusion, Plasma and Space Physics

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