RADIAL DENSITY PROFILE CHANGE NEAR LOWER-HYBRID FREQUENCY IN M=0 HELICON WAVE PLASMAS

Radial density profiles are measured near the lower hybrid frequencies with various magnetic fields and frequencies in m = 0 mode helicon wa ve plasmas. Abrupt radial density changes occur near the lower hybrid frequency where the electron density is higher. Experiments under vari ous conditions such as various magnetic fields and gases show that the se phenomena occur near the lower hybrid frequencies. (C) 1998 Elsevie r Science B.V.