RF phase monitor final report

In the CLIC two beam acceleration scheme the Main Beam must be precisely synchronized with respect to the RF power produced by the Drive Beam. Timing errors would have an impact on the collider performances. The Drive Beam phase errors should be controlled, by means of a feed forward system, within 0.1° (23fs @ 12GHz) to avoid a luminosity reduction larger than 2%. A beam phase arrival monitor is an essential component of the system. Its design has been based on the following main requirements: resolution of the order of 20fs, very low coupling impedance due to the very high beam current and integrated filtering elements to reject RF noise and wake fields in the beam pipe that could otherwise affect the measurements. As foreseen by Task 5 of the EuCARD WP9 NCLinac, the monitor has been designed, manufactured and tested, both in lab and with the beam in CTF3.