Because all the temperatures in the corner station seemed to increase by ~ 0.1 C or so, I changed the target temperature of the precision cooler near SR2 from 22.00 to 21.00.
The reason for the temperature increase is not clear. One possibility is the reduction of cooling power on the tunnel wall due to the reduction of water.
No temp recovery, just stop increasing. So I need more reduction of the target temperature yesterday.
I changed the target temp of the precision cooler near SR2 from 21.00 to 20.00 around 9:30.
Fig.4 shows that the temperature in the corner station decreased by 0.1 °C, except for IXC. So we reduced the heater power of the Sunrise heater that was set near the compressor between IXC-A from 1.2kW to 600W around 10:00 (Fig.1~3).
The following are the staff moving and activity process
KAGRA entrance Shutter Open 10:11
Enter the Corner station 10:15
Reduce the heater power10:19
Exit the Corner station 10:22
KAGRA entrance Shutter Close10:26
The temperatures in the corner station area, including the IXC area, have recoverd.
