TY - GEN
T1 - Electric potential near the extraction region in negative ion sources with surface produced negative ions
AU - Fukano, A.
AU - Hatayama, A.
PY - 2011
Y1 - 2011
N2 - The potential distribution near the extraction region in negative ion sources for the plasma with the surface produced negative ions is studied analytically. The potential is derived analytically by using a plasma-sheath equation, where negative ions produced on the Plasma Grid (PG) surface are considered in addition to positive ions and electrons. A negative potential peak is formed in the sheath region near the PG surface for the case of strong surface production of negative ions or for low energy negative ions. Negative ions are reflected by the negative potential peak near the PG and returned to the PG surface. This reflection mechanism by the negative potential peak possibly becomes a factor in negative ion extraction. It is also indicated that the potential difference between the plasma region and the wall decreases by the surface produced negative ions. This also has the possibility to contribute to the negative ion extraction.
AB - The potential distribution near the extraction region in negative ion sources for the plasma with the surface produced negative ions is studied analytically. The potential is derived analytically by using a plasma-sheath equation, where negative ions produced on the Plasma Grid (PG) surface are considered in addition to positive ions and electrons. A negative potential peak is formed in the sheath region near the PG surface for the case of strong surface production of negative ions or for low energy negative ions. Negative ions are reflected by the negative potential peak near the PG and returned to the PG surface. This reflection mechanism by the negative potential peak possibly becomes a factor in negative ion extraction. It is also indicated that the potential difference between the plasma region and the wall decreases by the surface produced negative ions. This also has the possibility to contribute to the negative ion extraction.
KW - Extraction region
KW - Negative ion sources
KW - Negative potential peak
KW - Plasma-sheath equation
KW - Surface produced negative ions
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U2 - 10.1063/1.3637376
DO - 10.1063/1.3637376
M3 - Conference contribution
AN - SCOPUS:80053632171
SN - 9780735409552
T3 - AIP Conference Proceedings
SP - 68
EP - 77
BT - Second International Symposium on Negative Ions, Beams and Sources, NIBS2010
T2 - 2nd International Symposium on Negative Ions, Beams and Sources, NIBS2010
Y2 - 16 November 2010 through 19 November 2010
ER -