NONLINEAR ANTENNA LOADING MEASUREMENTS IN TCA
The TCA tokamak is mainly dedicated to the study of additional heating by the absorption of Alfven Waves (omega << omega-ci). RF waves are launched by the antennae to heat the plasma core. Unwanted edge dissipation can reduce the heating efficiency and may lead to spurious edge heating. A sufficiently large bias voltage of the antennae can decrease the RF impedance, as well as increase the strength of the wave fields. This observation indicates the presence of some parasitic loading, particularly evident at low power, and reduced above 50 kW. The loading stabilizes at bias voltages below -60 volts. The asymptotic loading is compared with numerically calculated values. The origin of these effects is discussed.
Bibliographic Reference: 4TH INT. SYMP. ON HEATING IN TOROIDAL PLASMAS, ROMA, MARCH 21-28, 1984.
Availability: Can be ordered online
Record Number: 1989122096700 / Last updated on: 1987-01-01
Available languages: en