@article{oai:nifs-repository.repo.nii.ac.jp:00010571,
 author = {IDA,  Katsumi and Kobayashi, Tatsuya and YOSHINUMA,  Mikiro and YOSHINUMA,  Mikirou and AKIYAMA,  Tsuyoshi and TOKUZAWA,  Tokihiko and TSUCHIYA,  Hayato and ITOH,  Kimitaka and LHD, Experiment Group},
 journal = {Physics of Plasmas},
 month = {Dec},
 note = {0000-0002-0585-4561, A distorted Maxwell-Boltzmann distribution of epithermal ions is observed associated with the collapse of energetic ions triggered by the tongue shaped deformation. The tongue shaped deformation is characterized by the plasma displacement localized in the toroidal, poloidal, and radial directions at the non-rational magnetic flux surface in toroidal plasma. Moment analysis of the ion velocity distribution measured with charge exchange spectroscopy is studied in order to investigate the impact of tongue event on ion distribution. A clear non-zero skewness (3rd moment) and kurtosis (4th moment –3) of ion velocity distribution in the epithermal region (within three times of thermal velocity) is observed after the tongue event. This observation indicates the clear evidence of the distortion of ion velocity distribution from Maxwell-Boltzmann distribution. This distortion from Maxwell-Boltzmann distribution is observed in one-third of plasma minor radius region near the plasma edge and disappears in the ion-ion collision time scale.},
 title = {Observation of distorted Maxwell-Boltzmann distribution of epithermal ions in LHD},
 volume = {24},
 year = {2017}
}