Duke storage ring tune measurements system using razor blade and photomultiplier

We present in this paper the description of the Duke storage ring tune measurements system. An unusual feature of this system is the use of synchrotron radiation to sense oscillation of the electron beam. This system includes a lens, a razor blade placed at the focus and a photomultiplier. Our experience shows that this system can operate on -70 dBm level and detect electron beam oscillations as small as one micron.