Bruker Biospin Ag

Cengiz Cetrefli

Daniel Marek

Philippe Stauffenegger

Marc A Schnell

Oskar Schett

Daniel Guy Baumann

Klemens Kessler

Marc Enrique Paredes

Marc Schnell

A method for the transmission/reception of RF signals for NMR measurements uses a heat exchanger () for cooling heat sources (), the heat exchanger having a contact element () for thermal connection between a cryogenic fluid and the heat source, is characterized in that the heat exchanger comprises a container having an interior volume Vinto which a first cryogenic fluid Fthat has a liquid component Fand a gaseous component Fflows through an inflow conduit () and from which a second cryogenic fluid Fthat has liquid component Fand a gaseous component Fflows out through an outflow conduit (). The inflow conduit has a flow cross-section Qand a circumference Ufrom which an associated parameter V=4&#xb7;Q/Uresults, wherein V&#x3e;10&#xb7;V, and the outflow conduit has a flow diameter Qwherein Q&#x2265;Q. The contact element is in close thermal contact with both the liquid volume component Vof the cryogenic fluid and with the heat source. A device for setting the inflow quantity of the first cryogenic fluid Finto the container is provided that ensures a state F/F&#x3e;F/Fduring operation. In this way, vibrations due to the cooling process can be largely reduced and the consumption of cryogenic fluid minimized.

Method for cryogenic cooling of an NMR detection system with the assistance of a container filled with a cryogenic fluid

An NMR (nuclear magnetic resonance) apparatus has a magnet system disposed in a cryostat (), the cryostat having at least one nitrogen tank () for receiving liquid nitrogen () and a room temperature bore () for receiving an NMR probehead (), wherein part(s) of the probehead or the overall probehead can be cooled to cryogenic temperatures by supplying liquid nitrogen () via a supply line (). The nitrogen tank () of the cryostat () is connected to the NMR probehead () by means of a supply line () in such a fashion that liquid nitrogen () is removed from the nitrogen tank () and guided to the NMR probehead (). The overall apparatus is therefore more compact, the operating comfort of the apparatus is increased, and the costs for acquisition, operation and maintenance are considerably reduced compared to previous comparable devices.

Cryogenic probehead cooler in a nuclear magnetic resonance apparatus

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Zurich, Switzerland

Cengiz Cetrefli