Turn by Turn BPMs
last modified
03-10-2008 15:09
General description :
The same BPMs used for slow Closed Orbit measurement can also be used for Turn-by-Turn measurements. A simple and low-cost extension was implemented in 1999 to add this functionality while preserving fully the advantages of the slow system that uses time multiplexing between the 4 RF signals from the BPM buttons.
The precise and reproducible synchronisation of the data acquisition system with the deflection kicker makes it possible to repeat and average over a large number of cycles, thereby achieving high resolution of 1um.
References & links of relevant papers and presentations :
B.K.Scheidt, “Breaking New Ground with High Resolution Turn-by-Turn BPMs at the ESRF”, DIPAC’01, Grenoble, 13-15 May 2001.
http://accelconf.web.cern.ch/AccelConf/d01/papers/IT08.pdf