DIRECT-CURRENT HYDROGEN ION SOURCE Russian patent published in 2007 - IPC H01J27/04 

FIELD: acceleration engineering in science and technology using hydrogen ion beams having medium current intensity of several milliamperes.

SUBSTANCE: proposed DC hydrogen ion source using pin-type cold cathode has solenoidal coil wound on nonmagnetic vacuum chamber and accommodating first magnetic pole with central depression, first stainless steel cathode in the form of flat disk with central cup-shaped depression abutting against first magnetic pole, anode in the form of hollow stainless steel cylinder, second cold cathode in the form of stainless steel disk with depression along its axis and emission hole in center, its protruding part being inserted into second magnetic pole hole; through hole is made in first magnetic pole, first cold cathode, and in ion-source vacuum chamber to receive refractory metal pin one of whose ends is inserted in ion-source vacuum chamber and other end is joined with mechanism affording forward and backward motion of pin along ion source discharge chamber axis. Anode is made in the form of hollow cylinder accommodating central annular bridge; two thin-walled nonmagnetic metal cylinders are inserted into anode on both ends in front of bridge to protect cathode and anode insulator from ingress of vacuum-pump oil carbon.

EFFECT: enhanced service life of ion source at ion direct current of several milliamperes.

1 cl, 1 dwg