Separator

Liquid helium is continuously supplied to the separator through a short, vacuum-insulated siphon line between it and the magnet. The separator pot is monitored by liquid level LL91113, and a 0-2000 mbar pressure transducer PI91125. A metal bellows pump, MP91127, is used to force the siphon and also removes vapor from the separator, thus improving the performance of the 1 K refrigerator. Flow through this pump is measured by a 0-100 slpm flow transducer, FI91127, and metered by EV91127, which is controlled by a stepper motor (Section 8). An optical encoder is used to measure the valve position (# turns).