TY - GEN
T1 - Characteristics of volume produced negative hydrogen ions in a field-effect-transistor based ion source
AU - Tanaka, N.
AU - Funaoi, T.
AU - Oikawa, K.
AU - Saito, Y.
AU - Nakano, H.
AU - Ando, A.
PY - 2013
Y1 - 2013
N2 - Measurement of negative hydrogen ions (H-) is one of the important diagnostics for development of negative ion sources. Cavity-Ring-Down (CRD) measurement system was successfully implemented for the H- density measurements in the Field-Effect-Transistor based Radio Frequency ion source. Reliability of the CRD system was experimentally confirmed, and basic characteristics of the H- ions and the ion source were studied. The measured H- density varied from 1015 to 1016 m-3 depending on the source parameters, such as input RF power, axial magnetic field in the driver region, and source pressure. The H- density increased linearly with increase of the RF power and the axial magnetic field increased, due to improvement of power transmission and plasma production efficiency. Source gas pressure dependence of the Hdensity showed an increase of H- density with the decrease of pressure. Higher electron temperature and lower neutral gas resulted in increased production of vibrationally excited molecules and decreased destructions of H- ions, which was feasible for in high H- density at low source pressure.
AB - Measurement of negative hydrogen ions (H-) is one of the important diagnostics for development of negative ion sources. Cavity-Ring-Down (CRD) measurement system was successfully implemented for the H- density measurements in the Field-Effect-Transistor based Radio Frequency ion source. Reliability of the CRD system was experimentally confirmed, and basic characteristics of the H- ions and the ion source were studied. The measured H- density varied from 1015 to 1016 m-3 depending on the source parameters, such as input RF power, axial magnetic field in the driver region, and source pressure. The H- density increased linearly with increase of the RF power and the axial magnetic field increased, due to improvement of power transmission and plasma production efficiency. Source gas pressure dependence of the Hdensity showed an increase of H- density with the decrease of pressure. Higher electron temperature and lower neutral gas resulted in increased production of vibrationally excited molecules and decreased destructions of H- ions, which was feasible for in high H- density at low source pressure.
KW - Cavity-Ring-Down measurement
KW - Negative hydrogen diagnostics
KW - RF negative ion source
UR - http://www.scopus.com/inward/record.url?scp=84875913351&partnerID=8YFLogxK
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U2 - 10.1063/1.4792793
DO - 10.1063/1.4792793
M3 - Conference contribution
AN - SCOPUS:84875913351
SN - 9780735411364
T3 - AIP Conference Proceedings
SP - 263
EP - 269
BT - Third International Symposium on Negative Ions, Beams and Sources, NIBS 2012
T2 - 3rd International Symposium on Negative Ions, Beams and Sources, NIBS 2012
Y2 - 3 September 2012 through 7 September 2012
ER -