The MN temp went from 78K to 88K at 8:40.

The temp is now 102K and on the process of increasing. Ushiba-kun will reduce the current.

I reduced the current from 0.1 to 0.05 A (fig1).

94K around 9:30, and on the way of reduction.

I increased IM heater current to 0.2 A (fig1).

I turned off ETMX IM heater.

Ushiba-san(remote), Ikeda

Around 10:00, We turned on IM heater of ETMX(fig1).

The IM temp is increasing.

I reduced the current applied to IM heater from 0.1 A to 0.08 A (fig1).

The temps of EX and EY IM are almost the same, ~65.6K around 10:44. However, the currents for IMs are almost the same: 0.08A and 0.078A. So the current for EY of 0.08A is better to reduce because of the lower cooling power for the EY payload.

The present IM temperatures of EX and EY. So, should the current for the EX IM heater be more than 0.08A, but less than 0.1A? On the other hand, the current for the EY IM heater should be kept?

I increased the current for EX IM heater from 0.08A to 0.088A (fig1).

At least 90K can be acceptable for the IM temp. However, the warmup speed seems to be small.

Judging from the temp situations just before starting cryocoolers for the payload, only outer shield temps (80K_SHIELD_SIDEA/B/TOP) and the 4K_REF2/4_50K_HEAD, and maybe the area between these two points are over 157K at which the water will come out.

In addition, the vacuum level changes at EXT and EXC were small (8->5x10^-6Pa, 5->2.5x10^-6Pa) when the temperatures of these areas fell below 157K. this means that the water reduction and increase effect will be small.

So, we believe we can stop these cryocoolers for payloads (or one of the coolers) for a while to accelerate the warmup. However, cracking noise could be occur again for a while.

I increased the current for EX IM heater from 0.088A to 0.102A (fig1).

I increased the current for EX IM heater from 0.110A to 0.102A (fig1).

I reduced the current for the EX IM heater as Fig.1.

I reduced the current from 0.109 A to 0.107 A.

I increased the current from 0.107 A to 0.108 A.