An Improved High Intensity Supersonic Helium Beam Source

  • Barbara A. J. LechnerEmail author
Part of the Springer Theses book series (Springer Theses)


The helium beam source is a key component of the helium-3 spin-echo spectrometer and determines the energy resolution of the experiment. Here, a new high-intensity supersonic beam source is presented, consisting of a new nozzle assembly and a new skimmer mount. The new nozzle achieves beam energies as low as 2.5 meV, increasing the energy resolution of the experiment by a factor of 5.5 and extending the accessible timescales into the nanosecond range. Furthermore, an improved skimmer mount design increases the signal intensity by 20 %. After a brief introduction to supersonic beam sources, the design of the new source is described and experiments characterising its performance are discussed.


Beam Energy Beam Intensity Mach Disk Beam Source Nozzle Pressure 
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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  1. 1.Materials Sciences DivisionLawrence Berkeley National LaboratoryBerkeleyUSA

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