RF density fluctuations measurements in the Phaedrus-T tokamak
- Univ. of Wisconsin, Madison, WI (United States). Nuclear Engineering and Engineering Physics Dept.
A swept frequency reflectometer based on a 26.5--40GHz YIG oscillator has been used to measure RF induced density fluctuations in the Phaedrus-T tokamak. The Phaedrus-T tokamak, is conducting experiments on Alfven wave current drive. Up to 400kW of RF are launched with a two strap fast wave antenna at frequencies between {omega}{sub ch} and {omega}{sub cd}. The reflectometer can be used in X or O mode, enabling the authors to cover a wide range of densities. Both modes of operation are sensitive mainly to density fluctuations. The RF component of the reflected signal, normalized to the total reflected signal, shows strong RF density oscillations in the core. Additions of impurities removes the core signal. This is in agreement with the toroidal Alfven resonance condition. In addition the signal in the core shows significant correlation with the loop volt drop observed during current drive experiments. Further data on the behavior of the density fluctuations as the magnetic field and plasma density are varied are presented, and compared with the predictions of a toroidal cold plasma wave code.
- DOE Contract Number:
- FG02-88ER53264
- OSTI ID:
- 182762
- Report Number(s):
- CONF-950612-; ISBN 0-7803-2669-5; TRN: IM9608%%127
- Resource Relation:
- Conference: 22. international conference on plasma science, Madison, WI (United States), 5-8 Jun 1995; Other Information: PBD: 1995; Related Information: Is Part Of IEEE conference record -- abstracts: 1995 IEEE international conference on plasma science; PB: 312 p.
- Country of Publication:
- United States
- Language:
- English
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