Plasma and Fusion Research

Volume 14, 1202135 (2019)

Rapid Communications

Application of Ion Sensitive Probe to High Density Plasmas in Magnum-PSI

Yuki HAYASHI, Noriyasu OHNO¹⁾, Hennie van der MEIDEN²⁾, John SCHOLTEN²⁾, Shin KAJITA³⁾, Jonathan van den BERG²⁾, Renato PERILLO²⁾, Jordy VERNIMMEN²⁾ and Thomas MORGAN²⁾

: National Institute for Fusion Science, National Institutes of National Sciences, Toki 509-5292, Japan
1): Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
2): DIFFER-Dutch Institute for Fundamental Energy Research, Eindhoven, The Netherlands
3): Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya 464-8603, Japan

(Received 2 May 2019 / Accepted 21 June 2019 / Published 24 July 2019)

Abstract

Feasibility of an ion sensitive probe was evaluated in high electron density (> 5 × 10¹⁹ m⁻³) helium plasmas produced in the Magnum-PSI device. The ion sensitive probe showed that the ion temperature was ∼ 1 eV and almost equal to the electron temperature. Increasing the neutral pressure to efficiently lead to the electron-ion recombination processes, the electron currents were collected at the ion collector. A secondary electron emission in the guard electrode might have an effect on the ion current.

Keywords

ion sensitive probe, ion temperature, I-V characteristic, Magnum-PSI

DOI: 10.1585/pfr.14.1202135

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References

[1] A.Yu. Pigarov et al., Phys. Lett. A 222, 251 (1996).
[2] I. Katsumata et al., Jpn. J. Appl. Phys. 6, 123 (1967).
[3] N. Ezumi et al., J. Nucl. Mater. 337-339, 1106 (2005).
[4] H. Takahashi et al., Phys. Plasmas 26, 022511 (2019).
[5] J. Rapp et al., Fusion Eng. Des. 85, 1455 (2010).
[6] N. Ezumi, Contrib. Plasma Phys. 41, 488 (2001).
[7] D. Korzec et al., Sci. Technol. Adv. Mater. 2, 595 (2001).
[8] M.R. Talukder et al., J. Appl. Phys. 91, 9529 (2002).
[9] S. Kajita et al., Phys. Plasmas 24, 073301 (2017).
[10] H.J. Meiden et al., Appl. Phys. Lett. 109, 261102 (2016).