MCC had informed the shift crew that the beam was down due to a "large dipole trip" - aka Nur's HCLog entry at 16:14. Beam is still not back an hour later. Jay just called and informed us that it was the Hall B dipole that crashed, which has nothing to do with us, but that the real problem is that when they completed the Hall C slit scan that was begun at 15:30, aimed at optimizing the beam delivery for us overnight, they were not able to re-establish the beam conditions that we were using this afternoon. Restoring the previous settings exactly has produced a very unstable beam, unacceptable halo now everywhere etc.
Reza has been called in to try and get back to where they were prior to 15:30.
Our goal tonight is to get back to 110 uA with acceptable halo rates on halo3 and halo4 and non-damaging rates at the Compton region. Stay tuned... (no pun intended)