UV emission of silicon oxide molecules observed from a non-thermal atmospheric pulsed dielectric barrier discharge was experimentally explored in a spectral range from 228 to 253 nm. The main vibrational bands (1, 1), (2, 2) and (0, 1) of A 1 -X 1 + electronic transition were investigated. Corresponding synthetic spectra was built up and adjusted with good agreement. Excitation temperatures (T vib , T rot ) were deduced as a function of gas composition. It is shown that the rotational temperature can represent a non-intrusive diagnostic of plasma gas temperature in process control.

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Two H-mode regimes have been identified in JET in which edge localized modes @LM's) maintain steady-state conditions. In the first regime, strong gas puffig was used in combined (ICRF plus NBI) heating experiments at powers of up to 2OMW. Rapid ELM activity occurred and at moderate powers (-8MW) steady-state H-modes with durations of up to 18s and energy codmement times of up to 95% of the JETiD-DID scaling were established. At high toroidal beta (PN 2 1.5) H-mode plasmas were also found to exhibit regular ELM behaviour which resulted in steady-state H-modes with confinement enhancement of -90% of the JETD-IIID scaling. This paper examines the plasma properties of these regimes and assesses their implications for steady-state H-mode operation in ignited plasmas.

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