Study of the beam extraction system of a negative ion source with a C12A7 electride plasma electrode

Kobayashi, Masaaki; Sasao, M.; Kisaki, M.; Eguchi, Takayuki; Wada, M.

doi:10.1063/1.5083721

Cited by 5 publications

(1 citation statement)

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“…Alternative materials for the use of Cs, such as carbon materials, are being studied and high Hproduction yields from the surface of Cs-free plasma are expected [5,6]. Recently, a new inorganic material with low work function and high conductivity, C12A7 electride, has been studied as a material for PE/PG [7,8,9].…”

Section: Introductionmentioning

confidence: 99%

Probe measurement of an ECR hydrogen plasma facing the C12A7 electride surface

Bito

Sasao

Wada

2022

J. Phys.: Conf. Ser.

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Plasma parameters of an ECR discharge excited in a compact ion source with a replaceable plasma electrode (PE) were measured with a Langmuir probe. The PE was installed to investigate how an electride PE changes the plasma parameters from those with a Mo PE. The effect upon the plasma parameters in front of the PE due to the material will be elucidated by changing the probe position axially along the beam extraction direction. Analyses of the measured probe characteristics revealed that electride PE has a higher electron density (ne) and lower electron temperature (Te) than the Mo PE. When the PE was biased negatively, the ratio of the positive saturation current (Ii ) to the negative saturation current (Ie +Ih- ) for the electride PE was about 1.6 times of the ratio for the Mo PE.

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