[Nakagaki, Yasui]

I tried to turn off the heater on the 8K shield, but this power output was already 0W.

We checked the situation and found that the AC alarm was active on this power supply.

It appeart that the heater shut off due to a drop in the input valtage.

According to the temperature of the 8K shield top, the heater appeared to have stopped before 8:31(JST) on Aug 27.

Around this time we experienced a momentary power outage at this site.(klog 37420)

We checked the resistance of this heater and found no issues.

Anyway, we completed the pre-heating work.