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Classified abstracts 3723-3733 3723. Semi automatic cryogenic pump for a particle accelerator. (France) A cryogenic pump is described, specially designed to be used in an electrostatic particle accelerator. The same tubular liquid helium bath provides pumping in the accelerating tube and around the beam. The temperature of the bath can be adjusted between 2.2 and 2.4. K, the liquid helium level, in the low pressure bath, is kept constant through a feeding system made of an heat exchanger and an expansion valve. An auxiliary container for liquid nitrogen and liquid helium, at atmospheric pressure, allows a several days continuous run without filling. This system allows refilling of the container without changing the pressure on the bath. M M F Bottiglioni et al, Vide, 32 (I 88), 1977, 81-89 (in French).
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Classified abstracts 4364-4373 tungsten wire, the initiation of a discharge is found to be dependent on the filament geometry. The effect of connecting the discharge power supply to either the positive or negative leg of the filament is examined. When the emission current becomes a sizeable fraction