Aanesland, AneCharles, ChristineBoswell, RoderickFrederiksen, Ashild2015-12-132015-12-130093-3813http://hdl.handle.net/1885/82293Fluctuations in the floating potential are measured in a cylindrical magnetised plasma, as the phase between a "primary" Helicon antenna and a "secondary" immersed antenna is varied. The two antennas are powered by separate radio frequency (RF) generators of 13.56 MHz controlled by a single oscillator and phase shifter. The Helicon antenna is separated from the plasma by a glass tube, while the immersed copper antenna is in direct contact with the plasma. The image presented here shows floating potential fluctuations of ∼100 Hz where the amplitude of the fluctuations vary dramatically with the phase between the two RF generators.Keywords: Antenna feeders; Antennas; Helicons; Oscillators (electronic); Phase shifters; Probes; Dual antenna generated plasmas; Fluctuations; Helicon antenna; Immersed antenna; Radio frequency plasma; Plasmas Dual antenna generated plasmas; Fluctuations; Radio frequency plasma200510.1109/TPS.2005.8451332024-04-14