Phason disorder is expected to modify the neutron and x-ray scattering spectra of quasicrystals.However,it is not clear yet if phasons are coherent modes in real space,or if they should be considered as local random defects.In this work,a comparative study of different sorts of phasons is performed,and their effects on the dynamical strucutre factor of Fibonacci chains are analyzed in detail.the results show that coherent and random phasons can be distinguished for high values of the monmentum transfer.Finally,it is observed that a random phason produced in the quasicrystal's hyper-space leads to a coherent phason field in real quasicrystalline lattice.
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