Kimura, Yasui (Pleas add details as a comment)
(1) We Connected 5 TMPs(#3, 5, 7, 41, 29).
(2) We stopped 3 ion pumps(#5, 7, 29)
(3) Stop one cryocooler for teh radiation shield(P-55).
*We did not turned on 8K shield heater for IX because Kimura-sama found an issue for the medm screen for the heter control.
at 15:46 GVbsx and GVbsy were closed by the interlock system triggered by increase of the vacuum pressure in mainly IY. GVix was not closed.
Finally, we recognaized the vacuum pressure in IX and BS were order of 10^-5Pa and opened GVbsx.
Nakagaki, Yasui
We stopped the other cryocooler for radiation shield(P-53) at 10:24.
The compressor operating time was 16392.9h.
Nakagaki, Yasui
We stopped two duct shield cryocoolers.
9:55 Xfa (The compressor operating time was 22791.1h)
9:56 Xfs (The compressor operating time was 18290.6h)
GVitmx was closed by the interlock at 14:30 on December 27, 2025, because the vacuum pressure at X_00 reached 1E-3 Pa.
After closing GVitmx, the vacuum pressure in IXA (Top-Right of the attached figure) is decreasing.
We turned on the heaters on both side of the duct shield of IXC at 8:19, because the temperature of this duct shield was enough higher than 150K.
The heater power is about 8W.
Now, both side of IXC duct shields are heating up.
I uploaded the screenshot of the heater control panel.
Fig. 1: IX-Arm side.
Fig. 2: IX-BS side.
GVetmx was closed by the interlock at 6:057 on December 29, 2025, because the vacuum pressure at X_30 reached 1E-3 Pa.
Finally, all the GVs around the cryostats were closed.
Since the temperatures at the cold heads of the cryocoolers for the duct shields of IXC reached the room temperature, we turned off both sides of the duct shield heaters at 9:45 a.m. on January 5th, 2026.