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

Authors

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