Speaker
Description
TPDsheet-U[1] has been designed to research behaviors of the negative hydrogen ions (H${^−}$) in the high-density sheet-plasma, which is optimized for volume production. Also, H${^−}$ is produced by volume production at periphery of sheet plasma.[2] The reduction of the electron co-extraction is an essential issue for all negative-ion sources. We are currently researching the extraction system for reduction of the co-extracted electrons.[3,4] In this contribution, we represent the improved extraction system on TPDsheet-U by attaching the soft magnetic material plate for magnetic filter (SMF) on plasma grid for reduction of co-extraction electrons. The minimum current ratio I${_e}$/I${_H}$- and H${^−}$ current density J${_H}$- was ~0.2 and 2.2mA/cm${^2}$ at discharge current of 50A.
[1]K.Hanai, et al., Plasma Fusion Res. (2020).
[2]K.Hanai, et al., Fusion Eng. Des. (2019).
[3]H. Kaminaga, et al., Rev. Sci. Instrum. (2020).
[4]H. Kaminaga, et al., Fusion Eng. Des. (2021).
| E-mail for contact person | 6bsp1114@hope.tokai-u.jp |
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| Funding Information | National institute for fusion science, Japan Society for the Promotion of Science |
