C-Band LINAC for a race track microtron

Abstract

The general aim of this thesis is to do the radiofrequency (RF) design of a 2 MeV C-Band linac for a RTM, the mechanical design and thermo mechanical calculations and to follow the machining procedure. Afterwards, a test bench has to be designed so the RF cold measurements may be carried out. In addition, the process of brazing of accelerating cavities will be studied. The novelty of this thesis arises from the fact that C-band linac was never used before in RTM. Specific of linac operation in RTM is defined by necessity (i) to accelerate simultaneously in the same linac low energy non relativistic beam from the electron gun and several different energy relativistic beams from the orbits; (ii) to accelerate beams moving in opposite directions; (iii) transverse dimensions are important to provide beam bypass at 1st orbit; (iv) to have sufficiently large aperture to decrease beam losses; (v) to pay attention to parasitic modes, especially to TM11 -like modes, which may cause transverse BBU (Beam Blow Up). Due to this specific of RTM linac, its design for C-band cannot be just scaled from the known designs for S-band. A full scale study, including beam dynamics and RF properties simulation and optimization, engineering design, test and final measurements must be done within this thesis.