Confinement scaling of core plasma electrons in the ELMO Bumpy Torus experiment

Recent high microwave experiments in the ELMO Bumpy Torus-Scale (EBT-S) at power levels through 200 kW cw at 28 GHz cover a broad parameter range (density, temperature, potential well, etc.), the operating window (T-mode) increases with power, and the plasma characteristics change significantly with operating parameters (power and pressure). Because the density profiles are observed to change with these parameters, compasions with zero-dimensional theoretical expectations for the complete data set are not possible. However, it is shown that for controlled power and pressure combinations, scale lengths and eφ/Te are constant and the electron transport in EBT-S scales neoclassically; the power balance (Pμ∼n2/T1/2e ) and particle balance (τE/τp ∼constant) are consistent with neoclassical predictions.