Bruker Biospin Ag

Marc Enrique Paredes

Daniel Marek

Philippe Stauffenegger

Marc A Schnell

Cengiz Cetrefli

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.

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Zurich, Switzerland

Marc Enrique Paredes