Since the last intervention on the main chiller, the temperature of the Neovan head increased again (see fig. 1), probably causing a worsening of the beam shape, and consequently a power loss on the PMC and a bad behavior of the PSTAB loop.
Thus, this morning we stopped the main chiller flow for some seconds (switching off/on the chiller) and it seems that this action was enough to partially free the circuit, as the temperature lowered by almost 1 degree.
Looking at the PMC, the power increased and the PSTAB rms seems to be better (fig. 2 and 3): to be checked once in LN3 again.
We will follow the behavior the next days.
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