@article{oai:nifs-repository.repo.nii.ac.jp:00010924,
 author = {TOKAR, Mikhail and TOKAR, Mikhail Z. and OSAKABE,  Masaki and KOBAYASHI,  Masahiro and Mukai,  Kiyofumi and NAGAOKA,  Kenichi and NAGAOKA, Ken-ichi and TAKAHASHI,  Hiromi and TANAKA,  Kenji and MORISAKI,  Tomohiko and LHD Experimental Group, and LHD Experimental Groups, and the  LHD Experimental Groups, and the LHD Experimental Group,},
 issue = {7},
 journal = {Plasma Physics and Controlled Fusion},
 month = {Jun},
 note = {0000-0002-9536-9841, Experiments on the Large Helical Device with the injection of carbon pellets into discharges of low density have demonstrated a significant reduction of the ion heat conduction in the plasma core and an increase in the central ion temperature by a factor of up to 2. These results are interpreted in the framework of a transport model elaborated on the basis of those applied previously to explain the improvement in confinement by impurity seeding into the tokamak devices TEXTOR and JET. The calculations performed reproduce well the strong peaking of the ion temperature profile with increasing carbon density nZ and the consequent drop in the confinement as nZ exceeds a certain critical level. The importance of different elements in the model, such as braking of the main ion rotation by friction with impurity ones and the shape of the density profiles, are investigated. A qualitative assessment of the applicability under fusion reactor conditions, e.g. of much higher plasma density and heating power, is performed.},
 title = {A mechanism of ion temperature peaking by impurity pellet injection in a heliotron plasma},
 volume = {62},
 year = {2020}
}