Today we have observed multiple large disturbances to beam stability. These can be characterised by large jumps in the horizontal beam position, which at its extreme amounts to a loss of beam from our behalf. M2 mirror feedbacks are able to return the beam to the initial position after ca. 10 minutes. Beam jumps have been approximately 1hr apart. We do not observe the beam on the XTD6 tunnel imager in this case, but do observe good lasing quality on the XGM. |