The temperature of EX_50K_REFBRT_HEAD has now increased up to around 90K again. So the temps of BRT3/4 were over the critical temp again. The vacuum level at EXT/C slightly increased, but they seemed to be N2 and CO. H2O is constant.

The temperature of EX_50K_REFBRT_HEAD  is now fluctuating around 95K, and BRT4/3/2 temperatures are now over the critical temperature. Then, the vacuum level at EXC/T was enhanced by a factor of 1.5 ~ 2.

The temperature of EX_50K_REFBRT_HEAD is glowing up to 125K that was larger than the previous enhancement of 121K as shown in Fig.1, and the Vacuum level at EXC/EXT is now enhanced around 7 AM on 12th June.

In the previous case at around -42 days ago, the drastic reduction of TM_OPLEV_LEN_SUM_OUTPUT. On the other hand, no changes in MN.

In addition, TM_OPLEV_LEN_SUM_OUTPUT is increasing even if the vacuum level at EXT has worsened.

The temperature of EX_50K_REFBRT_HEAD is still fluctuating around 110 K, as shown in Fig.1

On the other hand, the vacuum level at EXT was almost recovered at 2x10^-5 Pa from 10*10^-5 Pa, even though all the BRT1/2/3/4 temperatures were over the critical temperature (Fig.2). The vacuum level enhancement was dominated by water according to the Qmass. In addition, the pressure enhancement was higher at this time than in the last accident, maybe because of the higher temperatures at the BRT1/2/3/4 positions.

The TM_Oplev_LEN_SUM_OUTPUT shows strange changes at the last, and this time accident. The 2/3 reduction in the last accident, but almost a recovery of value in this time.  Any frosting on the windows on the inner/outer radiation shields, LEDs, and QPD photosensors in the cryopayload cannot explain the recovery phenomena. On the other hand, the MN_Oplev_LEN_SUM_OUTPUT seems not to show drastic changes at two accident times. 

The GRX_NORM  seemed to be roughly constant in the last  50 days, while the GRY_NORM showed 1.1! in the past, but around 1.0 at present. Anyway, not so serious frosting on HR sides are expected from this data.

The cryocooler 1st head temperature for the BRT side finally started decreasing as shown in Fig.1. So the temperature of BRT1,2,3,4 also started decreasing.