Abstract
A fast-digital feedback system stabilizing the photon beam position for a beamline was tested. A DSP (digital signal processor) board linked with 16-bit ADC and 14-bit DAC boards was used as a digital controller of the feedback system. The DSP system sampled the signals from a photon beam position monitor at a high rate of 10 kHz and set the magnet currents for a 3-magnet orbit bump steering system at the same rate. The system frequency response was easily compensated in gain and phase by programming. As a result, the feedback system well suppressed the beam motion up to 100 Hz. >
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