====== MPMS-5S Helium transfer ======

The Squid should be refilled if Helium levels are below 50%


===== Filling =====

  - Make sure you have a helium vessel that still has enough (what is enough?) helium
  - Close all valves of the vessel
  - Attach hose to compressor and vessel.
    -{{images:squid-2-compressor.png}}
  - Open valves between vessel and compressor
  - Remove fillcap from SQUID. It will POP out!
  - Attach the fill hose (recovery line) between the SQUID and Cryostat.
    -{{images:squid-2-valves.png}}
  - Open the valves on this hose.
  - Get the large **main** fill line
    -{{images:squid-2-helium.png}}
  - Open red valve on He-vessel. Put the large part of the hose into the vessel at average speed.
  - Wait until cold gas sputters out the other end of the fill hose (~one minute). You will get a cold flame.
  - Remove the small cap from the recovery line on the SQUID
  - Insert the other end of the fill hose in the SQUID. (use heat-gun if it gets suck because it got frozen.
  - Go to the computer and select: utilities->helium fill->start
  - Plug in the power line of the compressor.
  - You are now pumping. It is best to monitor the refill. (It will take about 30 minutes) Pay attention to:
    - The pressure (read-out on He-Vessel indicator) should not exceed 0.5 Bar. You can regulate this by clamping the compressor bypass.
    - The fill rate (read-out on computer) should be around 1-1.5%/min.
    - The Vessel Valve should be heated while filling with the heating gun(at half-heating power), to prevent the valve from freezing.
  - There are no instructions yet to stop the filling and disconnect the He-Vessel. Ask for help.

Original (InkScape) {{wiki:squid.svg.pdf|vector graphic}} (remove pdf extension).