[Kimura and Yasui]
 On February 5, the helium gas inside the cold heads of the duct shield cryo-cooler unit were replaced.
The cold heads whose helium gas was replaced were and Yfa (arm side of the IYC) and Xfa (arm side of the IXC). 
Yfa worked from 10:30 AM to 11:40 AM, and Xfa worked from 1:30 PM to 3:30 PM.
The pressure of the helium gas in the cold heads is 15 bar. 
The grade of helium gas used was G1.

[Kimura and Yasui]
 On February 10, we replaced the consumable parts of the helium compressor for the cooling unit at the X-end, which had exceeded 28,000 operating hours.
The consumable parts are the adsorber and filter unit. The compressors serviced were two units: P-53 ( 28,000 operating hours)  and P-56 ( 30,000 operating hours) .
 The helium gas inside the cold head of the duct shield cryo-cooler unit called Xea was replaced.
The pressure of the helium gas in the cold heads is 15 bar. 
The grade of helium gas used was G1.
　Replacement of the helium gas in the cold heads of Xer is scheduled for February 12.

[Kimura and Yasui]
 On February 12, the helium gas inside the cold head of the duct shield cryo-cooler unit called Xer was replaced.
The pressure of the helium gas in the cold heads is 15 bar. 
The grade of helium gas used was G1.

[Kimura and Yasui]
 On February 17, the consumable parts of the helium compressor for the duct shield cryo-cooler unit was replaced.
The consumable parts are the adsorber and filter unit. The compressors serviced was one unit: Yea.
 The helium gas inside the cold head of the duct shield cryo-cooler unit called Yea was replaced.
The pressure of the helium gas in the cold head is 12.5 bar. 
The grade of helium gas used was G1.

 Replacement of the helium gas in the cold heads of Yer is scheduled for February 18.

[Kimura and Yasui]
 On February 18, the consumable parts of the helium compressor for the duct shield cryo-cooler unit was replaced.
The consumable part is the filter unit. The compressors serviced was one unit: Yer.
 The helium gas inside the cold head of the duct shield cryo-cooler unit called Yer was replaced.
The pressure of the helium gas in the cold head is 8.0 bar. 
The grade of helium gas used was G1.