Measurement of negative ion density in a magnetized sheet plasma by DC laser photodetachment method

Authors

Hidenori Takahashi Graduate School of Engineering, Doshisha University, Japan
Marko E. Arciaga National Institute of Physics, University of the Philippines Diliman
Alexander G. Mendenilla Graduate School of Engineering, Doshisha University, Japan
Toshiro Kasuya Graduate School of Engineering, Doshisha University, Japan
Henry J. Ramos National Institute of Physics, University of the Philippines Diliman
Motoi Wada Graduate School of Engineering, Doshisha University, Japan

Abstract

A magnetized sheet plasma produced with the combination of a pair of Helmholtz coils and a pair of permanent magnets can create an ideal condition to produce the negative hydrogen ion (H⁠^–⁠) by a volume production process. The H^–⁠⁠ density in a sheet plasma was measured by photodetachment current from H⁠^–⁠ upon irradiation of an 808 nm semiconductor laser. The maximum sensitivity of the photodetachment signal for the sheet plasma was about 0.4 μA/cm²W. The measured photodetachment current at the center of the plasma was one-third of that measured at 1 mm from the center. The photodetachment center showed a monotonic increase against increasing magnetic field up to 60 Gauss.

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Issue

2003: Proceedings of the 21st Samahang Pisika ng Pilipinas Physics Congress

Article ID

SPP-2003-2B-03

Section

Plasma Physics

Published

2003-10-22

How to Cite

[1]

H Takahashi, ME Arciaga, AG Mendenilla, T Kasuya, HJ Ramos, and M Wada, Measurement of negative ion density in a magnetized sheet plasma by DC laser photodetachment method, Proceedings of the Samahang Pisika ng Pilipinas 21, SPP-2003-2B-03 (2003). URL: https://proceedings.spp-online.org/article/view/SPP-2003-2B-03.