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A neutron spectrometer with associated particles coincident time-of-flight technique is being developed for deuterium plasma experiments in a large helical fusion device. In this experiment, the energy resolution less than 7% and the detection efficiency larger than 10-6 counts/neutron is required for the plasma diagnostics based on neutron spectrometry. The prototype spectrometer was partly assembled...
This paper presents recent experimental results in the Large Helical Device (LHD), which is the world largest helical system (Rax~3.6 m, aav~0.6 m, Bax~2.75 T) and has capability of steady state operation because of the superconducting magnets. LHD confines the plasma with Tio~2 keV and ne ~0.8times1019 m-3 for 1905 sec using the ICRF heating. In this case, the total plasma heating energy was ~1.3...
The neutralization loss of high-energy particles is studied by investigating the density dependence of the energetic neutral flux from large helical device plasmas of hydrogen and helium discharges. Clear difference between the density dependence of energetic particles originated from neutral beams and those produced by ion cyclotron radio frequency (ICRF) is observed. One of the causes of this difference...
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