The influence of the different antenna types on the plasma coupling will be investigated. Another aspect of the heating system is the matchbox. It is possible to get forward power of 3 kW with 10 W reflected power. Typical values for the capacitors are 250 pF for the tune and 150 pF for the load. B-dot measurements are already carried out.
Results are the spatial distribution of the wave field.
The wave field rotates right-handed as expected for helicon waves. The helicon wave exists as a rotating standing wave with an integer number of wave lengths fitting into the toroidal circumference. The aim of further measurement is to determine how the wave is taking part in the heating process. We exspect a mixture of inductive and helicon wave heated plasma. The mode of coupling determines the dominating damping mechanism.