Departmental Seminar

Recent progress of studies on Plasma-detachments and plasma-material interactions by utilizing linear plasma devices in Nagoya University

Professor Noriyasu Ohno
Nagoya University

In the next fusion devices like International Thermonuclear Experimental Reactor (ITER), it is expected that heat load to the divertor plate could be more than 10 MW/m2. Then, it is one of the critical issues to reduce heat load to the divertor plate and make precise estimation of the lifetime of plasma-facing components. For this purpose, comprehensive study of high heat flux plasma–wall interaction and control of heat load to the divertor plate should be required.
Scrape off layer (SOL) and divertor plasmas can be simulated by using linear plasma devices because of open magnetic field outside of the separatrix. Divertor plasma simulators, which can generate high heat flux plasmas in steady state, have contributed much to the basic understanding of SOL/divertor plasmas and plasma–wall interaction, since it provides a good accessibility for comprehensive measurements and a simple geometrical configuration.
This presentation overviews recent progress of studies on plasma-detachment, which is a key method to reduce plasma heat load onto divertor plate, and plasma-material interactions, focusing on nano-structured tungsten (W-fuzz), by using linear plasma devices in Nagoya University.

Noriyasu Ohno was born in 1962 in Japan. He received the Doctor of Science degree from Kyushu University in 1993. Since 2007, he is a Professor of Graduate School of Engineering at Nagoya University. He has been authored and co-authored of more than 300 peer reviewed journals and conference proceedings. He is interested in edge plasma physics in magnetically confined fusion devices, such as plasma detachment associated with atomic and molecular processes, and convective plasma transport, and plasma-material interactions. Professor Noriyasu Ohno is the director of Plasma Nanotechnology Research Center in Nagoya University from 2015. He is a member of the Fusion Technical Committee in the Ministry of Education, Culture, Sports, Science and Technology in Japan.


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