A high-flux beam source of fast neutral helium has been constructed by extending the designs of previous authors. The source is a dc or pulsed electric discharge in an expanding gas nozzle. The beam produced has a flux on the order of 1015 atoms/ssr and a mean velocity on the order of 107 cm/s. The composition of the beam has been determined by the use of particle detectors and by the observation of the excitation of certain target gases. An upper bound of 3.7*10-5 has been estimated for the He(2 3S1)/He(1S0) beam density ratio and a value of 0.2 found for the He+/He(11S0) beam density ratio.
D. W. Fahey et al., "High-flux Beam Source Of Fast Neutral Helium," Review of Scientific Instruments, vol. 49, no. 4, pp. 503 - 506, American Institute of Physics, Dec 1978.
The definitive version is available at https://doi.org/10.1063/1.1135449
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01 Dec 1978