[mTakahashi, Ushiba(remote)]
We stopped ITMX payload cryocooler (REF2, P-54) at 13:45 JST.
Cold head temperature started increasing just after stopping (fig1).
The other payload cryocooler (REF4, P-56) was already turned off, so there is no operating payload cryocooler for ITMX now.
I checked the temperature of the 80K_SHIELD_TOP, and it was 121 K. It will take one week or more to reach the critical temperature.
Even if it reaches the critical temperature, the expected vacuum level enhancement will be comparable to the vacuum level of X_00 around -21 days, which is the timing without operation of REF2/4 cryocoolers.
