Beam position monitors in the TESLA Test Facility linac

The transverse position of the beam in the TTF linac will be measured using two different types of monitors. For the alignment of the quadrupoles, a circular cavity was designed because of the desired resolution of 10 /spl mu/m and the limited longitudinal space. The amplitude of the TM/sub 110/-mode will be measured in a homodyne receiver, using a signal from the timing system as a reference. Stainless steel prototypes were tested. Furthermore, the single bunch behaviour was measured at the CLIC Test Facility. Coaxial striplines will be installed in the experimental area, having a resolution of better than 100 /spl mu/m. The averaged position of the whole bunch train or the position of an individual bunch will be measured using the amplitude-to-phase conversion.