Overview

NAGDIS-I (Nagoya University Divertor Plasma Simulator I) is a linear divertor plasma simulator experimentally constructed with the purpose of generating a plasma column with a large diameter and high heat flux plasma. The feature of this device is that it has better access to the device and superior flexibility compared with large torus devices. By using steady-state high heat flux plasma, it is possible to study the interaction between plasma and wall materials in the divertor region.

In 2013, we changed the name to "NAGDIS-PG" by combining with the magnetized coaxial plasma gun described below and we are conducting experiments.

Magnetized coaxial plasma gun is a device capable of generating high temperature and high density (n_e ∼ 10²² m^-3, τ = 200 μrm) plasma. Three kinds of power supplies such as gun power supply, gas puff power supply, and bias magnetic field power supply are discharged while adjusting the timing, and the magnetic field generated at the time of discharge forms the plasma shape and ejects the plasmoid. This simulates the intermittent plasma ejection phenomenon observed in the fusion device. By combining with the steady-state plasma of NAGDIS-I, it is possible to study the combined irradiation effect from intermittent and steady-state plasmas to the divertor material. In order to investigate fast phenomena, a high-speed spectroscopy system and a laser interferometer are installed.

Main research topics

• Damage on materials from high heat pulse plasma
• Combined irradiation effect from pulse and steady-state plasmas

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