Neutron Emission from Beam-Injected Fast Tritons in JET Plasmas with Reversed or Monotonic Magnetic Shear.
2004 (English)In: 31st EPS Conference on Plasma Physics, 2004, 4- p.Conference paper (Other scientific)
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 . Much larger “anomalous” beam-ion
losses (up to 40%) have been reported in TFTR experiments for plasma conditions with
reversed magnetic shear . 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.
nuclear fusion, neutron emission, neutron spectroscopy, MPR neutron spectrometer, DD reactions, DT reactions, heated plasma populations
Fusion, Plasma and Space Physics
IdentifiersURN: urn:nbn:se:uu:diva-71144OAI: oai:DiVA.org:uu-71144DiVA: diva2:99055