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Time domain computation of wakefields in periodic structures using the code ABCI

The code ABC1 (Azimuthal Beam Cavity Interaction) was created for the time domain computation of wakefields in accelerating structures of cylindrical symmetry. It allows the user to create a mesh which is contained in a window moving along with the exciting bunch rather than filling the whole structure. The number of mesh points required is therefore strongly reduced and so is the computation time. We have used ABC1 to check and improve results previously obtained for the CLIC disk loaded structure at 30 GHz and to investigate the wakefields in the LEP type superconducting cavity at 352 MHz, which we plan to use in the drive linac. Results are also reported for the LIL (LEP Injector Linac) accelerating structure at 3 GHz. which is being used for tests in the CTF (CLIC Test Facility).