Returning Liquid Helium

Hybrid Magnet and 18T Superconducting Magnet users are asked to return at least 20% of Liquid Helium usage in your Machine Time.

• Once your Machine Time is scheduled, we will give you the details if applicable. After your Machine Time, we will notify you the amount of liquid helium returned in the end of month.
• When the returned liquid helium is reached to 100 or 250 L, we will contact you to require the liquid helium return. The returning/delivery date and the vendor selection are to be discussed.
• If the amount required for the operation is predicted, deposit of liquid helium is acceptable.
• The payment needs to be made by the end of the year. Depends on the date of your Machine Time, the payment date could be carried over to the next year.
• If any trouble is caused and affects to your Machine Time, the helium return is not required.
  • Trouble before the operation : no return is required.
  • Trouble during the operation : the returning is required before the trouble happens. The excessed for the trouble will be paid by NIMS

- Hybrid Magnet

The amount used is calculated from when operation started to when the operation ended. It is measured by a liquid level gage attached with a vessel. The conversion chart is on the side of the helium vessel. If multiple vessels are used, the net amount of the liquid helium used is the amount used.

No needs to return the liquid helium used for cooling down the magnet.

- 18T Superconducting Magnet

The amount used is a decrease in a cryogenic magnetometer. A default value of the cryogenic magnetometer is set at 1₀ cm when Machine Time starts.
(For instance, the value was l₁ cm after the operation, the amount used is 1.58 x (l₀ x l₁) litter.)

If liquid helium is transferred during the operation, the amount transferred is added to the net amount.

Please note:

if the magnet is quenched, the excess used for the recovery will be added to the net amount.

Do not hesitate to contact us for the details.