Open AccessBeam instability in the vicinity of beam extraction region of negative ion source
Author(s) -
K. Nagaoka,
Ryoya Nakamoto,
T. Sasaki,
T. Hamajima,
H. Nakano,
K. Ikeda,
Y. Fujiwara,
M. Osakabe,
Y. Takeiri,
K. Tsumori
Publication year - 2022
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2244/1/012043
Subject(s) - instability , beam (structure) , ion beam , ion , atomic physics , range (aeronautics) , physics , materials science , optics , mechanics , quantum mechanics , composite material
Beam instability in the presheath region of negative ion beam extraction is investigated in theoretically and experimentally. The linear stability analysis shows that the beam instability is unstable due to coupling between positive ion flow and negative ion flow. On the other hand, no clear activity can be seen in the experiment in the frequency range predicted by the theory. The beam instability in the presheath region of negative ion beam extraction may not cause the degradation of the beam focusing because of collisional damping and/or Landau damping.