Patent ID: 8969840
Filing Date: 2015-03-03
Classification: G03F,H05G

Abstract:
1. A device comprising: a plasma generating system comprising a source of target material droplets and a laser producing a beam irradiating the droplets at an irradiation region to form a plasma, the plasma producing EUV radiation, wherein the droplet source is configured to elect a fluid from an orifice and a sub-system producing a first disturbance in the fluid during a first time period which generates droplets having differing initial velocities causing the spacing between at least some adjacent droplets to decrease as the droplets travel to the irradiation region, the sub-system producing a second disturbance different from the first disturbance at a second time period different from the first time period, the second disturbance cleans the orifice to a greater degree than the first disturbance.