Cooling device for a low temperature magnet system
AssigneeBruker Analytische MeBtechnik GmbH
InventorsTony W. Keller, Wolfgang Muller
Life of this patent
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Abstract
A cooling apparatus for a low temperature magnet system includes a superconducting magnet coil (32) which encircles a test space (36). The magnet coil (32) is surrounded by at least one intermediate shield (26, 29) and is contained in an evacuated outer shell (22). On the outer shell (22) is a motor driven refrigerator (11) which actively cools the at least one intermediate shield (26, 29) by means of a cooling arm (18) extending through the outer shell (22). For compensating the disturbing fields emitted by the motorized drive of the refrigerator (11) a sensing device is provided for picking up these magnetic and/or mechanical disturbing signals. The sensor signal controls at least one coil (62) for compensating the disturbing field effective in the test space (36).
Claims37
A cooling apparatus for a superconducting magnet, comprising:
- a magnet coil encircling a test space;
- an evacuated outer shell surrounding said magnet coil;
- an intermediate shield arranged between said magnet coil and said outer shell;
- a refrigerator with moving parts mounted on the outside of said outer shell, said refrigerator having a cooling arm extending through said outer shell and being in thermally conductive connection with said intermediate shield;
- sensing means for picking up magnetic and/or mechanical signals generated by said moving parts of said refrigerator during operation and for producing output signals related to said picked up magnetic and/or mechanical signals;
- and
- at least one additional coil to which said output signals of said sensing means are fed for compensating magnetic fields generated within said test space by said moving parts of said refrigerator.
Dependencies are inferred from the claim text.