ABSTRACT
The colliding bunch trains have an intervening gap of about 350 ns required for the rampup of an abort kicker and the clearing of ions for the electron ring. A beam position monitor button electrode located 50 em from the bellows provides a signal to a HP54120 high frequency oscilloscope and a R&S gated spectrum analyzer. The signal is gated in time to coincide with the gap where no beam is present. An FFT of the oscilloscope
signals is shown in figure 2. To calculate the equivalent Q-factor the amplitudes are measured in small time windows at the beginning and the end of the gap.
