KAGRA Logbook

FCL (Air)

shinji.miyoki - 21:35 Monday 08 December 2025 (35795)

Heater Cooler Adjustment

Because many TMPs and Dry pumps are operated at present, the temperatures at many places are increasing.

IX, IY: 0.6C increase at IXV and 0.5C increase at IYV. Heater power was reduced. From 600W to zero at IXV. From 900W to 300W at IYV around 21:00.
EX, EY: No way to reduce heater power because heaters are already off during observation O4c. We need to operate air conditioners tommorrow. 1C increase at EEV and 0.7C increase at EYV.
Corner station: I changed the temp setting from 21C to 19c for the SR2-C Daikun cooler around 21:00.
EXC: Very slight changes because several TMPs and Dry pumps were operated during O4c.
EYC: Almost no changes. However why???

Comments to this report:

shinji.miyoki - 9:46 Tuesday 09 December 2025 (35800)

I off the heater at IYV around 7:30.

Also, I changed the temp setting of the SR2-C daikin cooler from 19 to 18.

The air conditioner at IXV should be on to recover the temperature, in addition to EXYV.

shinji.miyoki - 14:45 Tuesday 09 December 2025 (35803)

(Hayakawa, Yamaguchi, Sawada, Miyoki(remote))

The following adjustments were done in the morning.

(IXV) Air conditioner was on at 20C target. 4 FFUs are operated from 1 FFU. The heater is off.
(EXV) Air conditioner was on at 22C target. 2 FFUs are operated from 2 FFU. The heater is off.
(EYV) Air conditioner was on at 20C target. 2 FFUs are operated from 2 FFU. The heater is off.

shinji.miyoki - 20:21 Tuesday 09 December 2025 (35813)

The following adjustments were done in the afternoon.

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shinji.miyoki - 9:11 Wednesday 10 December 2025 (35819)

The following adjustments were done around 9:30.

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