Abstract
Abstract We report low-frequency electromagnetic turbulence in the large-volume plasma device in a region that is receiving magnetically screened plasma. The magnetic screen is produced by activating a large solenoid that generates a strong magnetic field (B_EEF) transverse to the background axial magnetic field (B_z). The magnetic field strength variation inB_EEF controls the plasma diffusion and is responsible for parametric profile modifications in LVPD. The turbulence is characterised by the observed features of an electromagnetic (EMHD) mode having frequency ordering in the lower hybrid range (f_ci < f <f_LH). The free energy source for the excited turbulence is believed to be the prevalent finite radial pressure gradient in the system. The excited electromagnetic mode shows typical scales for the wave number, k_⊥ ~ 0.13 cm-1 and frequency f ~ 6 kHz and propagates with a phase velocity comparable to ion acoustic velocity, Cs in electron diamagnetic drift direction. It is believed that the low-frequency pressure gradient-driven electromagnetic mode exhibits coupling with the lower hybrid or whistler wave.
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