DEVICE FOR EXTRACTION OF PARTICLES Russian patent published in 1998 - IPC

FIELD: electron and ion-ray technology. SUBSTANCE: device is intended for extraction of beams of charged particles into atmosphere. During pumping of particle source 1 gas which pressure diminishes with movement to holes 2 is fed through holes 2 from nozzles into source. As result of bringing in of electrodes 4 to which voltage is supplied discharge is initiated in region of diminished pressure. Arc drawn between electrodes tends to take up stable position that is why it moves to external section of nozzle that leads to formation of magneto-gas-dynamic shock wave directed away from hole for extraction of beam which blocks gas coming into source. Thanks to continuous burning of arc there appears possibility to decrease power of pumping aids. EFFECT: decreased power of pumping aids. 1 dwg