Breathing mode of dust cloud in a cogenerated dusty plasma

Recently, different types of collective processes in dusty plasmas have become prime interest amongst plasma physicists. Dust particles are present in every variety of plasmas and play a vital role in plasma crystals, semiconductor material processing, low-temperature physics, nanomaterials etc. Keeping these in mind, we have done an experiment on a cogenerated unmagnetized dusty plasma in a stainless-steel chamber between two parallel electrodes with one electrode (anode) is grounded while the other is, a graphite cathode, connected with a bipolar pulsed dc power supply. It is experimentally observed that in cogenerated unmagnetized dusty plasma the carbon dust cloud is fluctuating as a breathing mode like a heart beat mode observed in dust void, both magnetized and unmagnetized plasma. The theoretical model suggests that, in cylindrical geometry, the Bessel´s differential equation gives a clear cut picture for the condition of occurrence of dust rotation (m ≠ 0) or the dust breathing mode (at m = 0, where m is the order of Bessel function). Our experiment clearly shows that the whole dust cloud is fluctuating in an unmagnetized plasma not only the void fluctuation.