@techreport{oai:nifs-repository.repo.nii.ac.jp:00009595,
 author = {"Hamada,  Y. and Nishizawa,  A. and Kawasumi,  Y. and Narihara,  K. and Sato,  K. and Seki,  T. and Toi,  K. and Iguchi,  H. and Fujisawa,  A. and Adachi,  K. and Ejiri,  A. and Hidekuma,  S. and Hirokura,  S. and Ida,  K. and Koong,  J. and Kawahata,  K. and Kojima,  M. and Kumazawa,  R. and Kuramoto,  H. and Liang,  R. and Sakakita,  H. and Sasao,  M. and Sato,  K. N. and Tsuzuki,  T. and Xu,  J. and Yamada,  I. and Watari,  T. and Negi,  I."},
 month = {Feb},
 note = {"By the use of simultaneous fast toroidal and slow poloidal sweeps of a heavy ion beam, plasma potential profiles in JIPP T-IIU tokamak are measured at the rate of 120 spatial profiles per second.  A new method to eliminate the error due to the change of out-of-plane entrance angle caused by large plasma current, is successfully applied.  One of the key factors is the very homogeneous characteristics of the energy analyzer along the wide slit length.  A shaped electrode system,  instead of guard rings with a resistor chain, successfully increases the homogeneity of an analyzer.  The error due to the significant change of an in-plane entrance angle during a poloidal sweep is carefully minimized and calibrated by a secondary beam ionized by neutral gas introduced in a vacuum vessel.  The depth of the measured potential at the plasma center reaches more than 1.5 keV in ohmic plasmas with the ion temperature of 600 eV.  In some cases, a rather wide region of positive potential and a sharp decrease of the potential in the center of the plasma are observed."},
 title = {Measurement of Profiles of the Space Potential in JIPP T-IIU Tokamak Plasmas by Slow Poloidal and Fast Toroidal Sweeps of a Heavy Ion Beam},
 year = {1994}
}