Abstract
A low voltage arc of the ``capillary'' type which has given reliable performance since its installation in 1940 is described. The design stresses simplicity and reliability, but no special attempt is made to attain very low consumption of gas. Operating at an arc current of 0.75 ampere and consuming 25 cc of deuterium at N.T.P. per hour, a total beam current of 1.1 milliampere is produced with a probe potential of 3500 volts. About 50 microamperes of deuterons, magnetically selected from this beam, can be focused on a target.

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