Filling a Magnet with Nitrogen

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Filling a Magnet with Nitrogen

  1. Find a rubber transfer line, two additional short pieces of rubber, and a glove.
  2. Wheel the low pressure dewar up to the magnet to be filled. Position the liquid transfer valve on the dewar near (4 ft away) the nitrogen fill port on the magnet. The fill port will be labeled.
  3. Attach the transfer line to the liquid valve on dewar.
  4. Remove the blue cover from the liquid nitrogen fill port.
  5. Slide the transfer line on the end of the fill port.
  6. Remove the covers to the vent port(s) and replace with short pieces of rubber tubing. This ensures the excess nitrogen is not sprayed toward the ceiling. The 600 and 700 have one vent port and the 400 and 300 have two vent ports.
  7. With one hand shape the transfer line so that there are no kinks in the tubing.
  8. With the other hand slowly open the liquid valve. Transfer nitrogen slowly at this point.
  9. After the transfer line freezes in place you can open the liquid valve more. The line should have a slight shake when the speed is appropriate.
  10. Replace the transfer line and rubber pieces with the port covers when the fill is complete. The fill will be complete when liquid nitrogen starts spitting out of the vent ports.
  11. Fill out the log book.
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