Video-Based Magnet Operation Tutorial

The following outline provides short descriptions and example video clips illustrating the procedures necessary to install and operate an AMI-provided superconducting magnet. The videos are not intended as a replacement for the provided printed manuals. The intent is to further clarify the required steps for installing and operating a superconducting magnet for inexperienced customers. Click the video clip icon to open a video. DSL, T1, or cable modem bandwidth connection recommended for real-time viewing.

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Page 4: Initial Cooling using Liquid Nitrogen (LN2) and 
Transfer to LN2 Jacket

Initial Fill with LN2
To initially fill the center reservoir with LN2, performed the following steps:
  1. Connect to the LN2 liquid port and insert the first LN2 transfer line into the support stand fill port (to fill the center reservoir of the dewar). 

    CAUTION
    Leave adequate venting for the nitrogen as it flashes from liquid to gas as cooling progresses    .
  2. Continue filling until the magnet is covered with LN2. Use a DVM to obtain a resistance measurement and to determine when the magnet is covered with LN2.

Transfer the LN2 from the Center Reservoir to the LN2 Jacket
Once the magnet is covered with LN2, the next step is to transfer the LN2 from the center reservoir to the dewar's LN2 jacket. This is accomplished by sealing the center reservoir and then pressurizing to force the LN2 into the jacket. To do so, perform the following steps:
  1. Insert a second transfer line into the second fill port of the support stand. Ensure the line reaches to less than 1" above the bottom of the center reservoir.
  2. Insert the other end of the transfer line into the the fill port of the LN2 jacket.
  3. Important: Open the second fill port of the LN2 jacket to allow the nitrogen gas to vent.
  4. Seal the pump port (or connect your pump equipment).
  5. Seal the vapor-cooled current lead vents. (Use a wire-tie or similar.)
  6. Place a weight on the relief valves of the center reservoir to prevent them from disallowing pressurization of the center reservoir.
  7. Move the first transfer line from the liquid port of the LN2 supply to the gas port.
  8. Open the gas port of the LN2 supply.
  9. Check the progress of the LN2 transfer by using a flashlight. If no bubbles are present, the transfer of LN2 from the center reservoir to the jacket is complete.
  10. Turn off the LN2 gas supply.

Completely Fill the LN2 Jacket
After the LN2 from the center reservoir is forced into the jacket, continue filling the jacket by:
  1. Remove the first transfer line (now connected to the LN2 gas supply port) from the support stand.
  2. Remove any weight from the support stand relief valves.
  3. Remove the second transfer line that connects the center reservoir to the LN2 jacket.
  4. Insert the first transfer line into an LN2 jacket fill port. (Ensure the second fill port of the LN2 jacket remains open to allow venting.)
  5. Connect the first transfer line to the liquid port of the LN2 supply and open the supply.
  6. Continue the fill until liquid is forced from the second fill port of the LN2 jacket.
  7. Once liquid is observed, shut-off the LN2 supply.
  8. Cap the LN2 jacket fill ports and observe proper operation of the relief vales for the jacket.

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