Abstract
The NSLS-II is a 3rd generation light source with ultra-low beam emittance that is currently under construction at the Brookhaven National Laboratory. Because the power of the synchrotron radiation from the damping wiggler (DW) is about 64kW, a slight mis-steer can result in severe damage to the vacuum chamber. To avoid such problems, an active interlock system is being considered. The system dumps the beam when it departs from the predefined safe window in the phase space. In this paper, we present simple geometric arguments from which we define the safe window on the basis of betatron amplitudes. This window can be applied to any DW around the ring. For the entrance of the wiggler, we obtained window of Δx=±8.4mm, Δx′=±429μrad and Δy=±2.1mm, Δy′=±449μrad.
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