@article{oai:nifs-repository.repo.nii.ac.jp:00010723,
 author = {PEREK, Artur and IDA,  Katsumi and YOSHINUMA,  Mikiro and YOSHINUMA,  Mikirou and GOTO,  Motoshi and NAKAMURA,  Yukio and EMOTO,  Masahiko and JASPERS, R.J.E and LHD, Experiment Group},
 issue = {7},
 journal = {Nuclear Fusion},
 month = {Jun},
 note = {0000-0002-4117-0298, Radial profiles of bulk ion and impurity ions density are simultaneously measured and
quantified using charge exchange spectroscopy and peaking parameter, Cv. The peaking
parameter is positive for inward and negative for outward convection in a plasma with an
impurity hole in the Large Helical Device. Following the formation of an impurity hole
associated with the transition from L-mode to ion ITB plasma, the bulk ion becomes peaked
by the inward convection (Cv>0), while impurities (helium and carbon) become hollow due
to the outward convection (Cv<0). In contrast to the ion ITB plasma, in the L-mode plasma
the impurity profiles are peaked (Cv>0), where the bulk ion density profile remains flat
(Cv0). Understanding of the impurity behavior in the ion ITB plasma could lead to a self
cleaning plasma reactor concept, with an efficient impurity exhaust.},
 title = {Observation of the bulk ion density peaking in a discharge with an impurity hole in the LHD},
 volume = {57},
 year = {2017}
}