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We investigate the time evolution of a system of quarks interacting withsigma and pion fields starting from an initial configuration consisting of atube of hot quark plasma undergoing a boost-invariant longitudinal expansion.We work within the framework of the linear sigma model using classicaltransport equations for the quarks coupled to the mean-field equations for themeson fields. In certain cases we find strong amplifications of any initialpion fields. For large-radius tubes, starting from quark densities that arevery close to critical, we find that a disoriented chiral condensate can formin the centre of the tube. Eventually the collapse of the tube drives thisstate back to the true vacuum. This process converts the disorientedcondensate, dominated by long-wavelength pion modes, into a coherent excitationof the pion field that includes significant components with transverse momentaof around 400 MeV. In contrast, for narrow tubes or larger initialtemperatures, amplification occurs only via the pion-laser-like mechanism foundpreviously for spherical systems. In addition, we find that explicit chiralsymmetry breaking significantly suppresses the formation of disorientedcondensates.Comment: 18 pages (RevTeX), 8 figures (psfig

Disoriented chiral condensate formation from tubes of hot quark plasma