Shift time: 9-17 (JST)
*Commissioning day
Check Items:
VAC: No issues were found. (Due to the temperature increase of the IX REF1 cryocooler, the vacuum pressure reached 10^-5Pa in the MICH area. )
CRY cooler:
10:00 IX: 4K_REF1_50K_HEAD (84.36 -> 110.47K) Informed to KImura, Ushiba
Consequently, the elevated temperature caused the evaporation of N2, O2, Ar, and CO2 from the inner shield, and the vacuum pressure around IX was also increased. Notably, there has been no detection of a serious excess of H2O. Fig.1
16:00 IX: 4K_REF1_50K_HEAD (107.42 -> 122.73K) Informed to KImura, Ushiba
There has been no detection of a serious excess of H2O.
Compressor: No issues were found.
GAS filter output: No issues were found.
IFO state (JST):
09:00 The shift started. The status was "LOCKING". The OBS INTENT was OFF for the commissioning work.
　During commissioning time, there were so many earthquakes. The earthquakes broke the IFO lock and disturbed measurements.
14:28 OBS intent has been turned on. -> "OBSERVING"
15:00 Lock lost
15:34 "OBSERVING"
17:00 This shift finished. "OBSERVING"
