Abstract
The scaling characteristics of the high-beta hot-electron rings in NBT-1M were studied experimentally. The hot electron temperature Th and the density nh were measured by the hard X-ray detection system, and were found to have typical values of 220 keV and 3×1010 cm-3, respectively. The stored energy of the hot electron ring, W⊥, scales empirically with the applied microwave power Pµ and the ambient gas pressure PH2 as W⊥ ∝PµPH2-1 in the quiescent T-mode. The dependence of the energy stored in the ring on the gas pressure in the T-mode can be explained by the simple energy balance equation. In T-mode operation, the temperature is independent of the applied microwave power, but the density increases with the power and decreases with the gas pressure.
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