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CRY (Cryostat EX)
nobuhiro.kimura - 16:39 Tuesday 18 August 2026 (37370) Print this report
Started heating the X-end cryo-duct shields

[Kimura and Yasui]

 We stopped the X-end cryo-duct shield cryo-coolers and started heating the cryo-duct shields.
 The cryo-duct shield cryo-coolers were stopped between 2:59 p.m. and 3:00 p.m.
Before stopping the cryo-coolers, we switched the vacuum exhaust pumps from the ion pumps to the turbo molecular pump.s
The switchover took place between 1:47 PM and 2:39 PM.

Comments to this report:
takashi.uchiyama - 17:35 Friday 21 August 2026 (37399) Print this report
Yasui, Uchiyama

We turned on the heaters of duct shield cryocoolers of EX at 17:40 on 21 August. The heater power is about 8W.

Fig. 1 shows current source for the heater of the Arm side cryocooler.
Fig. 2 shows current source for the heater of the BRT side cryocooler.
Images attached to this comment
takashi.uchiyama - 8:13 Monday 24 August 2026 (37402) Print this report

Temperature changes of the cryocoolers for the duct shield of EX.
Images attached to this comment
takashi.uchiyama - 9:32 Monday 24 August 2026 (37403) Print this report
2026/08/24
Uchiyama

I increased the heater power for the duct shields cryocoolers at EX from 8W to 18W.
Fig. 1 shows current source for the heater of the Arm side cryocooler.
Fig. 2 shows current source for the heater of the BRT side cryocooler.
Images attached to this comment
takashi.uchiyama - 12:24 Monday 24 August 2026 (37404) Print this report
2026/08/24
Yasui, Uchiyama

We turned on the heater on the EXC radiation shield at 12:20 on 24 August. The heater power was about 15W.


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takashi.uchiyama - 9:36 Tuesday 25 August 2026 (37410) Print this report
2026/08/25

Temperature changes of the cryocoolers for the duct shield of EX and IM of ETMX.
T0: 9:37JST on 25 August.
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takashi.uchiyama - 14:36 Tuesday 25 August 2026 (37412) Print this report
2026/08/25

Kimura, Uchiyama

Since the temperature of cryocoolers were over 280K, we reduce the heater power of the cryocoolers from 18W to 8W at 14:30.

Fig. 1 shows current source for the heater of the Arm side cryocooler.
Fig. 2 shows current source for the heater of the BRT side cryocooler.
Images attached to this comment
takashi.uchiyama - 13:38 Friday 28 August 2026 (37428) Print this report
2026/08/28
uchiyama

Since the temperature of the EX duct shields reached over 280K as shown Fig. 1, we stopped the heaters of the duct shields at 13:30. Now only the heater on the radiation shield is working.

Fig. 2 shows current source for the heater of the Arm side cryocooler.
Fig. 3 shows current source for the heater of the BRT side cryocooler.
Images attached to this comment
hiromi.yasui - 17:36 Monday 31 August 2026 (37433) Print this report

[Nakagaki, Yasui]

I tried to turn off the heater on the 8K shield, but this power output was already 0W.

We checked the situation and found that the AC alarm was active on this power supply.

It appeart that the heater shut off due to a drop in the input valtage.

According to the temperature of the 8K shield top, the heater appeared to have stopped before 8:31(JST) on Aug 27.

Around this time we experienced a momentary power outage at this site.(klog 37420)

We checked the resistance of this heater and found no issues.

Anyway, we completed the pre-heating work.

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