Direct measurement of density oscillation induced by a radio-frequency wave.
Rev Sci Instrum
; 78(8): 083502, 2007 Aug.
Article
em En
| MEDLINE
| ID: mdl-17764321
ABSTRACT
An O-mode reflectometer at a frequency of 25.85 GHz was applied to plasmas heated by the high harmonic fast wave (21 MHz) in the TST-2 spherical tokamak. An oscillation in the phase of the reflected microwave in the rf range was observed directly for the first time. In TST-2, the rf (250 kW) induced density oscillation depends mainly on the poloidal rf electric field, which is estimated to be about 0.2 kV/m rms by the reflectometer measurement. Sideband peaks separated in frequency by ion cyclotron harmonics from 21 MHz, and peaks at ion cyclotron harmonics which are suggested to be quasimodes generated by parametric decay, were detected.
Buscar no Google
Base de dados:
MEDLINE
Assunto principal:
Oscilometria
/
Ondas de Rádio
/
Radiometria
/
Elétrons
/
Gases
Tipo de estudo:
Diagnostic_studies
/
Evaluation_studies
Idioma:
En
Ano de publicação:
2007
Tipo de documento:
Article