This heat-up resulted in the vacuum level enhancement from 4x10^-6 Pa to 1x10^-5 Pa whose main part is water. TM_OLPEV_LEN values seemed to increase slightly and to show no drastic changes after heating up around 11am on 5th Feb.

Over 10^-5 Pa at IYA was again maybe because of over 180K temp at IM.

I turned off IM heater of ITMY.

I applied the current o IM heater of ITMY.

I turned off the heater because IY temperature was stopped to go down.
I will turn it on again later before ITMY was cooled down below 30K.

I turned on IM heater for ITMY.
Setting can be seen in fig1.

9V was applied to the EX IM heater, although the IM temperature was ~40K. So I changed the voltage for the IY heater from 3V to 7V because the temperature of IY IM was also around 40K as EX IM.

I increased the voltage from 7V to 7.5V.

I increased the voltage from 7V to 9V, and from 9V to 9.5V.

I adjusted the voltage to around 10.5V to find the equilibrium temperature state in this morning. Then the present temp is fluctuating around 35 K.

I increased the voltage from 10.5V to 10.6V because the temp started decreasing again.

I changed the voltage from 10.6 to 12.7 to 12.2 because the temperature started decreasing again after the second head temperature (4K_REF4_4K_HEAD) reduction of REF4 cryocoolers.

I increased the current for ITMY IM heater for warming up.

I reduced the current for ITMY IM heater.

I increased the current for ITMY IM heater to further warm up (fig1)

I turned off IM heater for cooling ITMY again.

I set some current for the IM heater to avoid too much cooling of IY IM around 8:30.

I increased the current as Fig.1.

I increased the current as Fig.1, again.

I asked Sawada-san to change the dehumidifier from a high-power one(310W) to a low-power one(210W). Then, the IXV temperature decreased. Then F1 and F2 started decreasing, but F0 also decreased. I asked Takahashi-san about the adjustment if it will reach the limit. 

I increased the current again as Fig.1.

You can see the temperature enhancement due to 10W power injection.

I reduced the current to IY IM heater to reduce the temperature as Fig.1 

I turned on IM heater for ITMY as shown in fig1.

I turned off IM heater.