Japan-Philippines research collaboration in negative ion production


  • Mamiko Sasao ⋅ JP Tohoku University, Japan


Negative beams of hydrogen isotopes (H/D) and heavy ions such as Au are widely used for heating plasmas in thermonuclear fusion facilities and for injectors of high-energy accelerator rings.
Dr. Henry J. Ramos contributed much to the development of a sputtering type Au source during his stay at the Institute of Plasma Physics (IPP) in Japan in the late 1980s [Nucl. Instrum. Methods Phys. Res.  B36, 227 (1989), IPP Research Report IPPJ-914 (1989)]. This source became the basis for the Au source still in use at the Large Helical Device (LHD) in Japan.
He also recognised the high potential of a sheet plasma source for H/D volume production. He designed a sheet plasma device during his stay in Japan, and upon his return to the Philippines, built an experimental device at the University of the Philippines and scaled it up for industrial applications.

About the Speaker

Mamiko Sasao, Tohoku University, Japan

Mamiko Sasao received the Ph.D. degree in Nuclear Physics from Tohoku University, in 1976, and continued research at Stanford University, Lawrence Berkeley Laboratory, and Osaka University. In 1981, she joined the Institute of Plasma Physics, Nagoya University (now re-organized as the National Institute of Fusion Science), and started research on burning plasma diagnostics and negative ion sources and beams. Since 2002, she had been a Professor in the Department of Quantum Science and Energy Engineering, Tohoku University, until her retirement in 2011. Now she is a Contract Researcher, Doshisha University, and Professor Emeritus, Tohoku University. Her current research interest is production of negative ions.
Her professional and social activities were Board Director and Board Comptroller, The Physical Society of Japan (2010–2012, 2021–2023), Coordinating Member, Science Council of Japan (2012–2023), Project Leader, Grant-in-Aid for Scientific Research on Priority Areas by MEXT (2004–2011).



Article ID



Invited Presentations



How to Cite

M Sasao, Japan-Philippines research collaboration in negative ion production, Proceedings of the Samahang Pisika ng Pilipinas 42, SPP-2024-INV-2G-02 (2024). URL: https://proceedings.spp-online.org/article/view/SPP-2024-INV-2G-02.