Sawtooth instability studies in the Stanford Linear Collider damping rings

Experimental results of the instability studies are being reported. The system built gives a BPM-derived single bunch 'instability signal". The signal was recorded simultaneously with the longitudinal density bunch profiles obtained from the synchroton light with the high resolution Hamamatsu streak camera. Correlation of the instability signal with the streak camera profiles has been found. For the strongly developed instability state the dominant mode structure was obtained.