SummaryThe design and construction of two highly ionized hydrogenous plasma sources are described. Details are also given of the measurements that have been made to investigate the formation, density distribution, and decay of plasmas.

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SummaryA study has been made of the decay of a hydrogen plasma of ion density .--3 X 1015 cm-3 and temperature .--10' oK. Details are presented of the experimental methods used to determine density and temperature distributions in the decaying plasma. The plasma decays by three-body recombination mainly and the experimental values of the recombination coefficient agree with those expected for a plasma opaque to Lyman radiation.