Beam–based alignment of the CLIC high-gradient X-Band accelerating structure using beam-screen

Abstract

An experimental campaign has been carried out at the European Organization for Nuclear Research (CERN) in order to estimate the wakefield kick in the X-Band accelerating structure of the future Compact LInear Collider (CLIC). The CLIC Project, currently under study, is an electron-positron collider with centre of mass energy of 3TeV and an instantaneous luminosity of $2 \times 10^{34}\ {\mathrm {cm}}^{-2} \mathrm{s}^{-1}$. The X-Band accelerating structures are able to sustain an accelerating gradient of 100MV /m. The wakefield kick is an electromagnetic field perturbing the particle bunch. This campaign is carried out at the CERN Linear Electron Accelerator for Research (CLEAR). A beam-based method to align the accelerating structure to the beam trajectory with the use of a beam-screen is proposed in order to estimate the transverse wakefield kick. Aligning such a structure to the beam trajectory, with an accuracy of $3.5\ \mu \mathrm{m}$, is a key point to achieve the above luminosity.