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 6: Liquid Helium (LHe) Transfer

Initial Helium Transfer
The next step in preparation for magnet operation is the transfer of liquid helium to the center well of the dewar. Accomplish the transfer by:
  1. First uncap both of the liquid input ports on the top of the support stand.
  2. Unpack the LHe transfer line (if purchased).
  3. Partially insert one end of the transfer line into the LHe supply.
  4. Slowly insert the other end of the LHe transfer line (with the "stinger" extension) into the magnet dewar. Push the transfer line all the way to the bottom of the dewar and lift about 1/4".
  5. Fully insert the transfer line into the LHe supply.
  6. Continue transfer of the LHe until the Model 13x instrument indicates the helium level covers the magnet (or is at some desired point).
  7. Allow the magnet dewar to sit in order to achieve thermal equilibrium.

Top-Off the Helium Level
Once the system achieves thermal equilibrium it may be necessary to transfer additional LHe lost during the cooling process.
  1. Uncap both of the liquid input ports on the top of the support stand.
  2. Partially insert one end of the transfer line into the LHe supply.
  3. Turn on the LHe supply through the transfer line and allow the transfer line to cool before inserting into the dewar. This will help minimize boil-off caused by injecting warm He gas into the dewar.
  4. Slowly insert the other end of the LHe transfer line (without the "stinger" extension) into the magnet dewar.
  5. Fully insert the transfer line into the LHe supply.
  6. Continue transfer of the LHe until the Model 13x instrument indicates the helium level covers the magnet (or is at some desired point).
  7. Balance the He gas flow in each of the vapor-cooled current leads.

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