Alignment of components and assembly of 3 MeV electron beam accelerator — A complete solution

A 3MeV, 30kW DC Electron Beam Accelerator developed at BARC is installed at the Electron Beam Centre (EBC) Kharghar, Navi Mumbai. The entire accelerator assembly, spread over two floors, consists of Electron Gun, Accelerating Tube, Steering Magnet, Focusing Coil, Beam Tube, Beam Locating Aperture, Scan Magnet Chamber and Scan Horn. The complete electron beamline will be maintained under high vacuum of the order of 10⁻⁶ mbar. The paper discusses about the present problem of alignment, measurement technique of alignment, reasons for misalignment, ways to solve the problem, detailed alignment procedure and equipment used for alignment work.