Measurements of H− Density and Work Function of a Plasma Electrode in a Negative Ion Source

2002 ◽  
Author(s):  
M. Nishiura
Keyword(s):  
Work Function ◽  
Ion Source ◽  
Negative Ion ◽  
Plasma Electrode

Actively cooled plasma electrode for long pulse operations in a cesium-seeded negative ion source

2005 ◽  
Vol 76 (1) ◽  
pp. 013501 ◽  
Author(s):  
Yukio Fujiwara ◽  
Kazuhiro Watanabe ◽  
Yoshikazu Okumura ◽  
Rusty Trainham ◽  
Claude Jacquot
Keyword(s):  
Ion Source ◽  
Negative Ion ◽  
Long Pulse ◽  
Plasma Electrode

Estimation of Electron Temperatures fromI-VCharacteristics of a Plasma Electrode of a Negative Ion Source

1992 ◽  
Vol 31 (Part 1, No. 2A) ◽  
pp. 381-382
Author(s):  
Motoi Wada ◽  
Hiroshi Tsuda ◽  
Mamiko Sasao
Keyword(s):  
Ion Source ◽  
Negative Ion ◽  
Plasma Electrode

Dependence of Au-Production upon the Target Work Function in a Plasma-Sputter-Type Negative Ion Source

1991 ◽  
Vol 30 (Part 1, No. 6) ◽  
pp. 1307-1312 ◽  
Author(s):  
Yushirou Okabe ◽  
Mamiko Sasao ◽  
Hitoshi Yamaoka ◽  
Motoi Wada ◽  
Junji Fujita
Keyword(s):  
Work Function ◽  
Ion Source ◽  
Negative Ion

scholarly journals Study of the Plasma near the Plasma Electrode by Probes and Photodetachment in ECR-driven Negative Ion Source

2009 ◽  
Author(s):  
M. Bacal ◽  
P. Svarnas ◽  
S. Béchu ◽  
J. Pelletier ◽  
Elizabeth Surrey ◽  
...  
Keyword(s):  
Ion Source ◽  
Negative Ion ◽  
Plasma Electrode

scholarly journals Negative Hydrogen and Deuterium Ion Density in a Low Pressure Plasma in Front of a Converter Surface at Different Work Functions

Plasma ◽  
2021 ◽  
Vol 4 (1) ◽  
pp. 94-107
Author(s):  
Sofia Cristofaro ◽  
Roland Friedl ◽  
Ursel Fantz
Keyword(s):  
Work Function ◽  
Inductively Coupled Plasma ◽  
Negative Ions ◽  
Ion Source ◽  
Negative Ion ◽  
Balance Model ◽  
Ion Density ◽  
Inductively Coupled ◽  
Work Functions ◽  
Surface Conversion

Negative ion sources of neutral beam injection (NBI) systems for future fusion devices like ITER (“The Way” in Latin) rely on the surface conversion of hydrogen (or deuterium) atoms and positive ions to negative ions in an inductively coupled plasma (ICP). The efficiency of this process depends on the work function of the converter surface. By introducing caesium into the ion source the work function decreases, enhancing the negative ion yield. In order to study the isotope effect on the negative ion density at different work functions, fundamental investigations are performed in a planar ICP laboratory experiment where the work function and the negative ion density in front of a sample can be simultaneously and absolutely determined. For work functions above 2.7 eV, the main contribution to the negative hydrogen ion density is solely due to volume formation, which can be modeled via the rate balance model YACORA H−, while below 2.7 eV the surface conversion become significant and the negative ion density increases. For a work function of 2.1 eV (bulk Cs), the H− density increases by at least a factor of 2.8 with respect to a non-caesiated surface. With a deuterium plasma, the D− density measured at 2.1 eV is a factor of 2.5 higher with respect to a non-caesiated surface, reaching densities of surface produced negative ions comparable to the hydrogen case.

Characterization of in situ work function and cesium flux measurement setup suitable for cesium seeded negative ion source applications

2019 ◽  
Vol 59 (10) ◽  
pp. 106023 ◽  
Author(s):  
P. Singh ◽  
M. Bandyopadhyay ◽  
K. Pandya ◽  
M. Bhuyan ◽  
A. Chakraborty
Keyword(s):  
Work Function ◽  
Flux Measurement ◽  
Ion Source ◽  
Negative Ion
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