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The access to overdense plasmas for both the electron Bernstein wave heating and the EB wave diagnostic via O-X-B mode conversion window was successfully demonstrated at W7-AS. In the EB wave heating experiments clear evidence for both model conversion steps were detected and resonant adsorption with a narrow profile was demonstrated. Also, the inverse process, the EB wave radiation of an overdense plasma was measured with an oblique viewing angles. The spectrum consists of a local cyclotron emission part and a non-local broadband high frequency part. Edge temperature perturbations excited by carbon injection were used to demonstrate the relationship between frequency and position of emission. Since for EB waves no density limit exists, the operation window of the electron cyclotron heating and diagnostic could be extended to densitites above the cut-off density.

Additional information

Bibliographic Reference: Article: Plasma Physics and Controlled Fusion, 41(1999), 273-284
Record Number: 199910826 / Last updated on: 1999-06-07
Original language: en
Available languages: en