Conceptual design of the post-PETS instrumentation line for CLIC

We propose a method to measure the time-resolved momentum distribution and beam size at the end of the decelerator in the drive beam complex of the Compact Linear Collider, CLIC. Conventional diagnostic methods are hampered by the very high beam power and large energy spread of the drive beam after up to 90% of its kinetic energy is converted into microwave power. Our method is based on sweeping the beam in a circular pattern to determine the momentum distribution and recording the beam size on a screen using optical transition radiation. We present an algorithm to extract the time-resolved momentum distribution. Furthermore, qualitative information about the beam size along the pulse train can be extracted from the image left on a screen by sweeping the beam linearly. We present simulation results that allow us to estimate the applicability