Compact cryogenic NMR sensor with integrated active cooling device

An NMR (nuclear magnetic resonance) measuring system, for measuring a test sample, the measuring system comprising:

• an NMR magnet system;
• a vacuum housing disposed within said NMR magnet system, said vacuum housing having a lower part and an upper part;
• an NMR probehead disposed within said vacuum housing;
• an NMR resonator disposed within said NMR probehead to surround the test sample;
• a cooling device having a cooling head, said cooling device generating a vibration spectrum that only consists of individual selective frequencies;
• a heat conducting carrier element in thermal connection with said NMR resonator;
• a heat conducting connecting element, disposed between and in thermal connection with said heat conducting carrier element and said cooling head, wherein said cooling device, said heat conducting carrier element and said heat conducting connecting element are disposed, structured and dimensioned to cool said NMR resonator to cryogenic temperatures;
• a vibration absorber mechanically connected to said cooling device, said vibration absorber having at least one oscillating mass element, wherein said at least one oscillating mass element has a resonance frequency which is adjusted to a vibration frequency of said cooling device or to a harmonic thereof;
• a mechanically flexible connecting element having good thermal conducting properties, said mechanically flexible connecting element disposed between and connecting said cooling head to said heat conducting connecting element;
• at least one damping element disposed between and connecting said upper and said lower parts of said housing;
• a diaphragm or corrugated bellows disposed between and connecting said lower and said upper parts of said housing in a vacuum-tight and mechanically flexible manner;
• heat insulating mountings disposed between and fixing said connecting element to said housing;
• and
• a shim system to which said probehead is mechanically fixed.