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In the first part of this work the standard concepts of adjusting an Hf generator to the usually variable impedance of an ICRH antenna are compared and discussed at length as to their advantages and disadvantages. Special attention has to be given to the possible occurrence of resonance, which can be caused by the normally long transmission cables and the discontinuities (for example, periodic isolator elements) inherent in them. Reports are made on the relevant operating experiences using as an example the ICRH apparatus on ASDEX and W7AS. Suggestions are made concerning how to solve the resonance problems which occur at various frequencies. In the second part of the work a new concept of broad wavelength antenna adjustment to the variable antenna load is introduced. This concept, based on the multi-phase transformer used in microwave transmission, could, if transferred to ICRH equipment, have significant advantages over the solutions described above. Above all, the possible broad wavelength adjustability to the variable load, with comparatively simple technical modifications, is worth mentioning.

Additional information

Authors: BRAUN F, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Report: IPP 4/247 DE (1991) 28 pp.
Availability: Available from Max-Planck-Institut für Plasmaphysik, 8046 Garching bei München (DE)
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