  Crystallization and radiation of accelerator beams is considered. For the
first time it is shown that crystallization conditions for charged particle
beams differs from those of plasma. Crystallization conditions of charged
relativistic bunches are found and shown that they may be satisfies in existing
linacs. The coherence radiation of crystalline beams in the XUV region is
investigated. Necessary conditions of coherency are found. The influence of
deviations from mean interparticle distance on the radiation coherency is
considered.
