US 12,394,549 B2
Cryogen-free superconducting magnet system
Johannes Adrianus Overweg, Uelzen (DE)
Assigned to Koninklijke Philips N.V., Eindhoven (NL)
Appl. No. 18/030,780
Filed by KONINKLIJKE PHILIPS N.V., Eindhoven (NL)
PCT Filed Sep. 23, 2021, PCT No. PCT/EP2021/076151
§ 371(c)(1), (2) Date Apr. 7, 2023,
PCT Pub. No. WO2022/073768, PCT Pub. Date Apr. 14, 2022.
Claims priority of application No. 20200942 (EP), filed on Oct. 9, 2020.
Prior Publication US 2023/0377787 A1, Nov. 23, 2023
Int. Cl. H01F 6/04 (2006.01); G01R 33/38 (2006.01); G01R 33/3815 (2006.01); H01F 6/06 (2006.01)
CPC H01F 6/04 (2013.01) [G01R 33/3804 (2013.01); G01R 33/3815 (2013.01); H01F 6/06 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A cryogen-free superconducting magnet system comprising:
a superconducting coil configured to generate a magnetic field,
a vacuum chamber with vacuum chamber walls limiting the vacuum chamber to the outside, and
a cryocooler configured to cool the superconducting coil, the cryocooler comprising a refrigerator with a first stage which is adapted for being cooled to a first temperature and a second stage which is adapted for being cooled to a second temperature, the second temperature being lower than the first temperature, wherein
the superconducting coil is arranged inside the vacuum chamber at a distance from the vacuum chamber walls,
the superconducting coil is equipped with two superconducting coil connectors which are galvanically connected to two current leads which are fed through the vacuum chamber walls for providing the superconducting coil with an electric current from outside of the vacuum chamber,
each current lead comprises a first section and a second section, wherein the cross-sectional area of the first section is less than the cross-sectional area of the second section,
the current leads are galvanically attached to the superconducting coil connectors and thermally connected to the first stage of the refrigerator with their respective second sections, and
the first sections of the current leads each comprise a cooling arrangement for cooling the first sections of the current leads by heat transfer to the outside at ambient temperature, the cooling arrangements for cooling the first sections of the current leads each being connected to a single common cooling channel.