Silvera, IsaacTempere, Jacques2012-05-072008Silvera, Isaac, and Jacques Tempere. 2008. Electron emission in superfluid and low-temperature vapor phase helium. Physical Review Letters 100(11): 117602.1079-7114http://nrs.harvard.edu/urn-3:HUL.InstRepos:8682984Tungsten filaments used as sources of electrons in a low temperature liquid or gaseous helium environment have remarkable properties of operating at thousands of degrees Kelvin in surroundings at temperatures of order 1 K. We provide an explanation of this performance in terms of important changes in the thermal transport mechanisms. The behavior can be cast as a first-order phase transition.en-USJournal Article2012-05-0710.1103/PhysRevLett.100.117602