Abstract:
The present invention is directed to methods of acetate quantification and acetate complexes useful in the methods of acetate quantification. Such methods and complexes are useful for any application where acetate quantification is desired, including measuring of concentration of 13C hyperpolarized acetate for imaging agent quality control in MRI and NMR spectroscopy. The disclosed acetate complexes may be prepared from acetate, Fe3+, and sulfosalicylic acid and from acetate, Fe3+, and salicylic acid.
Abstract:
A cryogen cooling system to cool a superconducting magnet is disclosed herein utilizing embedded vertical tubing with a large heat exchanging surface area. The tubing encompasses the magnet which is further surrounded by a 4 Kelvin thermal shield for extended ride-through. In one embodiment, the system is a hyperpolarizer having an internal high-pressure gas storage for quench gas and to initiate cool-down. Aspects of the invention utilize a minimal volume of pressurized gas, for example, four (4) liters of pressurized gaseous helium in a 150 mL liquid helium system. As such, the prior vent stack has been removed, along with the helium vessel and quench paths/ducts. The method of using the system is further simplified during ramping while the cool-down process utilizing liquids supplied from external dewars has been eliminated. Significant advantages include reducing the helium volume (and cost associated therewith) and allowing for a hermetically sealed vacuum system that is leak-proof.
Abstract:
Provided is an apparatus and method comprising, an airlock chamber; a cryogenic chamber; an equilibrator positioned between the airlock chamber and the cryogenic chamber that is configured to allow for the passage of a sample along to the cryogenic chamber; and a cooling unit that is thermally coupled to the equilibrator. Collectively, the airlock chamber, equilibrator, and the cryogenic chamber define a travel path. A machine-readable medium, comprising instructions which when executed by a controller causes a sample to be cooled, is also provided.
Abstract:
Provided is an apparatus and method comprising, an airlock chamber; a cryogenic chamber; an equilibrator positioned between the airlock chamber and the cryogenic chamber that is configured to allow for the passage of a sample along to the cryogenic chamber; and a cooling unit that is thermally coupled to the equilibrator. Collectively, the airlock chamber, equilibrator, and the cryogenic chamber define a travel path. A machine-readable medium, comprising instructions which when executed by a controller causes a sample to be cooled, is also provided.
Abstract:
A cryogen cooling system to cool a superconducting magnet is disclosed herein utilizing embedded vertical tubing with a large heat exchanging surface area. The tubing encompasses the magnet which is further surrounded by a 4 Kelvin thermal shield for extended ride-through. In one embodiment, the system is a hyperpolarizer having an internal high-pressure gas storage for quench gas and to initiate cool-down. Aspects of the invention utilize a minimal volume of pressurized gas, for example, four (4) liters of pressurized gaseous helium in a 150 mL liquid helium system. As such, the prior vent stack has been removed, along with the helium vessel and quench paths/ducts. The method of using the system is further simplified during ramping while the cool-down process utilizing liquids supplied from external dewars has been eliminated. Significant advantages include reducing the helium volume (and cost associated therewith) and allowing for a hermetically sealed vacuum system that is leak-proof.
Abstract:
A thermal switching device is presented. The thermal switching device includes a plurality of serpentine capillaries having a first end and a second end, where the first end is configured to be operatively coupled to a heating unit and the second end is configured to be operatively coupled to a cooling unit, and where the plurality of serpentine capillaries is configured to transfer heat from the heating unit to the cooling unit by circulating a working fluid in the plurality of serpentine capillaries.