Some preliminary experiments using libera BPMs in BEPCII

There are total 16 LIBERA BPMs in BEPCII, which is a double ring e+e- collider. The turn-by-turn BPMs serve as only tune measurement system in most cases during normal operation. We tried to do some more machine study using them: The local coupling parameter at the BPM, the resonance driving term. We also compare the difference from the different exciting method: single time kick with injection kicker or continuous sinusoidal kick with feedback system. Copyright © 2011 by IPAC'11/EPS-AG.