  In the framework of the upgrade of the SPARC_LAB facility at INFN-LNF, named
EuPRAXIA@SPARC_LAB, a high gradient linac is foreseen. One of the most suitable
options is to realize it in X-band. A preliminary design study of both
accelerating structures and power distribution system has been performed. It is
based on 0.5 m long travelling wave (TW) accelerating structures operating in
the 2{\pi}/3 mode and fed by klystrons and pulse compressor systems. The main
parameters of the structures and linac are presented with the basic RF linac
layout.
