@article{oai:nifs-repository.repo.nii.ac.jp:00011297,
 author = {MASAKI, Shingo and MAESHIRO, Kenta and TSUMORI,  Katsuyoshi and WADA, Motoi},
 issue = {Special Issue 2},
 journal = {Plasma and Fusion Research},
 month = {Aug},
 note = {0000-0001-5567-3892, Plasma parameters were compared in the extraction region of a negative hydrogen (H−) ion source between the discharge sustained by tungsten (W) and tantalum (Ta) high temperature cathodes. A hydrogen plasma driven by the Ta filament showed lower electron temperature and higher ratio of positive ion saturation current to negative ion/electron saturation current than a plasma excited by the W filament. Plasma potential indicated different spatial distribution along the direction of H− ion extraction corresponding to the voltage biased on the plasma electrode. These results are correlated to the intensities of the H− ion extraction current.},
 title = {Electric Potential Structure in the Extraction Region of the Negative Hydrogen Ion Source},
 volume = {14},
 year = {2019}
}