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Physics of Plasmas
The diffraction of dust acoustic ͑DA͒ waves around a long dielectric rod is observed using video imaging methods. The DA waves are spontaneously excited in a dusty plasma produced in a direct current glow discharge plasma. The rod acquires a negative charge that produces a coaxial dust void around it. The diameter of the void is the effective size of the "obstacle" encountered by the waves. The wavelength of the DA waves is approximately the size of the void. The observations are considered indoi:10.1063/1.2977986 fatcat:2jnokv22yvcbzhfsrnn4jddvim