Neutron Emission Rate Characteristics Of An Electron Cyclotron Heated Large Helical Device Deuterium Plasma

The total neutron emission rate (S-n) characteristics of electron cyclotron heated plasma were surveyed in the Large Helical Device in order to exhibit the thermonuclear performance of helical plasma. The dependence of S-n on electron density showed that S-n increased with an electron density of power of 3.1. To understand S-n, characteristics in the electron cyclotron heated plasma, a numerical simulation considering thermal deuterium-deuterium fusion reactions was performed. Although the numerical simulation overestimated S-n in a relatively low S-n region, calculated S-n matched the experimental result for a relatively high S-n region. A possible reason for the disagreement in the low S-n region is that effective charge due to the impurities such as carbon is changed because of the low density. (C) 2021 The Japan Society of Plasma Science and Nuclear Fusion Research