Abstract
Thermonuclear fusion neutron emissions of up to 3×10 9 neutrons/sec have been observed in Heliotron E deuterium plasmas. “Currentless plasmas” were produced by electron cyclotron resonance (53 GHz, 150 kW) and further heated by hydrogen neutral beam injection (2.2 MW, H °→ D + ). It is found that all observed neutron emissions have thermonuclear origin due to the absence of hard X-ray background. Agreement between neutron and charge exchange ion temperature measurements (500 eV< T i (0)<900 eV) has been found at intermediate densities (1.5<\bar n e <3×10 13 cm -3 ). The maximum fusion power carried by neutrons, 1.2 mW, is about 10 -9 of the absorbed neutral beam powers. The neutrons reported in this paper are the first observation of pure thermonuclear fusion neutrons in a helical heliotron plasma confinement device.
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