Cylindrical ion-acoustic soliton is studied experimentally in a DP-type plasma devise. The characteristics of the soliton agree rather well with an approximate solution of the modified Boussinesq equation except the spatial width which is wider than that of one-dimensional case.
It is observed experimentally that the cylindrical soliton breaks into many soliton-like pulses propagating outward after the collapse at the center of the cylinder with larger velocity than that before the collapse, and at the same time the increase of ion temperature has been observed. Energy and momentum of soliton are conserved before and after the collapse.
In an ion beam system, the soliton changes its shape, but it propagates as the fast mode.
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