Vector‐rf‐B‐field measurements in the near‐field of a helicon plasma source taken throughout the volume of the source are reported. Three distinct modes of operation of the helicon plasma source, capacitive, inductive, and helicon‐wave, are identified by the structure of the plasma‐wave‐fields. Results are reported for a double‐half‐turn antenna, which is believed to be the first reporting for such an antenna structure in application to helicon‐wave plasma sources. Comparison is made to a double‐saddle‐coil antenna which also demonstrates the distinct inductive and helicon‐wave modes.
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