[Shigeo Nagano, Kawamura, Kohei Yamamoto, Kokeyama, Furuta, Miyoki]

Because we observe condensation of the PSL table, refcav enclosure and so on, we tried some urgent remedies.

1. Temperature setting of the air conditioner was turned up from 22 deg C to 24 deg C. (Although the former setting was 22 deg, actually it used to drop to 19.5 deg
2. Dehumidifier was placed near the air duct sucking in the air from the outside to inside of the PSL room (dehumidifire.jpg).

See the attached plot. Upper panel is the temperature and bottom panel is humidity (ignore the glitch). The humidity goes up to 65% when the AC is turned off at the cycle of the temperature control. It used to go up to 75%. Hopefully it already avoid the condensation. After we changed the setting, the temperature deviation is about 1 deg (22.5 - 23.5) whereas it was 1.5 (19 - 20.5) deg C.

Nagano-san went to look the PSL room inside when the humidity 65% for the first time, condensation was not happening at least this time.

However this sudden humidity change is still bad. We are planning to install two more dehumidifier inside the room on Monday.