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Fluctuation induced inward particle transport in the tokamak SOL plasma

The spectral characteristics of fluctuation induced particle transport in the scrape-off layer region (SOL) of the ADITYA tokamak are measured. The transport is found to be inward at frequencies lower than 20 kHz and outward at higher frequencies. The sense of the observed inward particle transport is in agreement with that predicted by ionization driven drift wave turbulence theory. This observation suggests a very interesting method of controlling the particle confinement time by partial control of the long wavelength ionization instability