Low Temperature Cryostat

Abstract

A low temperature cryostat is disclosed. The low temperature cryostat may include a cryostat vessel, a cooling device arranged in the cryostat vessel for producing a cooling temperature level, a microscopy device for examining a sample, and at least one thermal coupling for thermally and mechanically connecting the microscopy device to the cooling device. The cooling device may comprise a pulse tube cooling system.

1 . A low temperature cryostat having
 a cryostat vessel,   a cooling device, arranged in the cryostat vessel, for producing a cooling temperature level TK,   a microscopy device for examining a sample, and   at least one thermal coupling for thermally and mechanically connecting the microscopy device to the cooling device, wherein   the cooling device comprises a pulse tube cooling system.   
   
   
       2 . The low temperature cryostat as claimed in  claim 1 , wherein the pulse tube cooling system comprises a turning valve that is arranged outside the cryostat vessel and is connected to the cryostat vessel via a vibration damping line. 
   
   
       3 . The low temperature cryostat as claimed in  claim 2 , wherein the vibration damping line is a flexible connecting hose. 
   
   
       4 . The low temperature cryostat as claimed in one of the preceding claims, wherein the pulse tube cooling system is a single-stage pulse tube cooler. 
   
   
       5 . The low temperature cryostat as claimed in one of the preceding  claims 1 , wherein the pulse tube cooling system comprises a multistage, in particular two-stage pulse tube cooler. 
   
   
       6 . The low temperature cryostat as claimed in  claim 1 , wherein the thermal coupling of the microscopy device to the pulse tube cooling system is designed in an elastic and vibration damping fashion. 
   
   
       7 . The low temperature cryostat as claimed in  claim 1 , wherein the microscopy device is arranged in a sample tube. 
   
   
       8 . The low temperature cryostat as claimed in  claim 7 , wherein the sample tube can be inserted into the cryostat vessel and can be thermally coupled to the cooling device via the thermal coupling. 
   
   
       9 . The low temperature cryostat as claimed in  claim 1 , wherein the cooling device comprises a first cooling stage in the form of said pulse tube cooling system, and a second cooling stage for a cooling temperature level in the range <4K, and wherein the second cooling stage is precooled by the first cooling stage. 
   
   
       10 . The low temperature cryostat as claimed in  claim 9 , wherein the second cooling stage has an adiabatic demagnetization device or a 3 He/4 He dilution cooler or a 3 He cooler or a mechanical cooling device such as a helium compressor cooler, or an electric cooling device such as a Peltier element or a superconducting tunnel diode such as an NIS diode. 
   
   
       11 . The low temperature cryostat as claimed in  claim 1 , wherein the microscopy device comprises a confocal microscope. 
   
   
       12 . The low temperature cryostat as claimed in  claim 1 , wherein the microscopy device comprises a scanning tunneling microscope. 
   
   
       13 . The low temperature cryostat as claimed in  claim 1 , wherein the microscopy device comprises an atomic force microscope.