Subjects for SC FF magnet system at ATF2

• Infrastructures at ATF2?How supply cryogen at ATF2

(set up cryogenic system?)(Gas helium recovery line?)

Set up power supplies for SC magnets• Safety at KEK?

How keep safety at KEK based on High pressure gas regulations by Japanese Gov.

Re-condensation Cryo-coolers(GM-JT type, 5W at 4.2K x3)

An example of semi cryogen free systemSKS Cryogenics system at KEK

Liquid He Vessel

Cryo-coolers for radiation shields60W at 80K6W at 20K

SC-Coil Vessel

Vacuum Vessel

20K shield

80K shield

LHe supply line

GHe recovery line

Cold mass: ~ 2 TonPre cooling time: ~ 4 weeksCryogen: LN2 (for pre-cooling) & LheCurrent feeds by HTC current leads

An example of ultra low vibration cryogenics system