Two types of the undulator which is developed as a generator of the highly brilliant light for the synchrotron radiation sources and the free electron lasers, are newly proposed using the array of slender plasmas columns.One is the magnetic field type, in which the undulator force on the relativistic electron beam is generated with the electric current flowing through the plasma columns.The other is the electricfield type, in which the undulator force is generated with the periodic variation of the density between the slender plasma columns.The production methods and the stabilization ones of plasma columns are discussed.
