Cold atoms without laser cooling

Description
Prof. Jack Harris, Dept. of Physics, Harvard University states that cooling atomic vapors with cryogenic helium is a powerful technique which (unlike laser cooling) can be applied to any atomic species and can produce very large samples of cold atoms. The ability to cool a wider range of atomic species opens the prospect of exploring new regions of atomic collisions, quantum fluids and tests of fundamental symmetries. However, most of these goals require the violent removal of the helium (to ensure that the trapped atoms are thermally isolated) and this has proved quite challenging. He describes recent experiments which address these challenges and succeed in tripling the number of atomic species which can be trapped using a cryogenic approach. This advance has been achieved through a number of technical innovations, including a novel cryogenic valve and magnetic traps which push the limits of superconducting technology. This work bridges the gap between atoms which can be trapped cryogenically and those which can be Bose-condensed. It also raises the possibility of trapping and evaporatively cooling the majority of atomic species in a single apparatus.

Description

Prof. Jack Harris, Dept. of Physics, Harvard University states that cooling atomic vapors with cryogenic helium is a powerful technique which (unlike laser cooling) can be applied to any atomic species and can produce very large samples of cold atoms. The ability to cool a wider range of atomic species opens the prospect of exploring new regions of atomic collisions, quantum fluids and tests of fundamental symmetries. However, most of these goals require the violent removal of the helium (to ensure that the trapped atoms are thermally isolated) and this has proved quite challenging. He describes recent experiments which address these challenges and succeed in tripling the number of atomic species which can be trapped using a cryogenic approach. This advance has been achieved through a number of technical innovations, including a novel cryogenic valve and magnetic traps which push the limits of superconducting technology. This work bridges the gap between atoms which can be trapped cryogenically and those which can be Bose-condensed. It also raises the possibility of trapping and evaporatively cooling the majority of atomic species in a single apparatus.

Details
Title	Cold atoms without laser cooling
Creator	Harris, Jack.
Creator	University of California, Berkeley. Department of Physics.
Published	2004.
Full Collection Name	UCB Physics Department Lectures
Subject (Topic)	Laser cooling Congresses. Atoms Cooling--Congresses.
Type	Video
Extent	1 streaming video file
Other Physical Details	digital, sd., col.
Archive	Physics Library
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Collection	Physics Lectures
Tracks	lectures/phys016.mp4
Linked Resources	View record in Digital Collections.

Cold atoms without laser cooling

Description

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