The beam-based alignment and feedback systems, essential operations of the future colliders, use high resolution Beam Position Monitors (BPM). In the framework of the European CARE/SRF programme, the task of CEA/DSM/DAPNIA (Saclay) is the design, the fabrication and the beam test of a BPM in collaboration with DESY. This system can be used in a clean environment, at cryogenic or room temperature. It is composed of a radiofrequency reentrant cavity with a beam pipe diameter of 78 mm and an analog electronics having several signal processing steps to reject the monopole mode. The mechanics and signal processing design is a compromise to get a high position resolution (better than 1 µm) and the possibility to perform bunch to bunch measurements for the X-FEL at DESY and the ILC. |
