We went to NEB in order to switch on the laser amplifier on the ALS rack (kheopsys), but the input laser of the amplifier was missing. This amplifier requires 0 dBm of input power but its internal sensor shows -5.4 dBm.

After investigation, it appears that the power that is sent to both ALS_NEB and ALS_WEB was cut off at the same time on May 6 2026, which indicates that the problem comes from EIB. The flip mirror has been switched to block the laser beam that goes toward ALS green laser generator.

Now the ALS_WEB amplifier works properly, but the power at the output of the ALS_NEB amplifier is still missing. It is required to go to NEB again to switch on the amplifier