Travelling Wave Accelerating Structure for Areal 50 MeV Energy Upgrade

AREAL facility development implies energy upgrade to 50 MeV in order to drive a THz free electron laser. To reach this goal, the installation of two 1.6 m long S Band travelling wave accelerating sections, with nominal accelerating gradient of 15 MV m, are foreseen. In this paper the design study of accelerating sections along with the matching performance of RF couplers are presented. The simulations are performed using the CST Microwave Studio.The first results of the accelerating structure prototype fabrication are discusse