Title :
Microwave plasma heating by cavity modes at electron cyclotron and lower hybrid frequencies
Author :
De Cunha Rapozo, C. ; De Assis, Altair S. ; Da Silva, J. C Xavier
Author_Institution :
Univ. Federal Fluminense, Niteroi, Brazil
fDate :
12/1/1990 12:00:00 AM
Abstract :
Radio-frequency (RF) plasma heating in the electron cyclotron and lower hybrid frequency ranges was studied using Langmuir and magnetic probes in the linear-mirror machine LISA. It was found that global modes were excited. The plasma was heated by electron cyclotron resonance and linear mode conversion at r=±3 cm using a RF source of 2.45 GHz and 1 kW. When an additional RF source of 30 MHz and 350 W was introduced, it heated the plasma via the lower hybrid resonance at r =±5 cm. An increase in overall electron temperature and plasma density was observed when both sources were present
Keywords :
Langmuir probes; plasma instability; plasma probes; plasma radiofrequency heating; LISA; RF plasma heating; cavity modes; electron cyclotron frequencies; global modes; linear-mirror machine; lower hybrid frequencies; magnetic probes; microwave plasma heating; Cyclotrons; Electromagnetic heating; Electrons; Frequency; Magnetic field measurement; Plasma density; Plasma sources; Plasma temperature; Probes; Resonance;
Journal_Title :
Plasma Science, IEEE Transactions on
