We describe a simple modification of a McPherson-Hinteregger-type capillary discharge lamp which converts it from a cold cathode discharge to a hot filament discharge. This results in about a 10-fold intensity increase in the 7–12 eV photon energy range and about a fourfold increase in operating time between cleanings. The spectral output power is presented.
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East̀man et al. (1970) studied this question.