Patent ID: 9699877
Date: 2017-07-04
CPC Classifications: H05G

Claim:
1. An extreme ultraviolet light generation apparatus configured to create a target droplet by joining successive droplets and irradiate the target droplet with a pulse laser beam in a plasma generation region to generate extreme ultraviolet light, the extreme ultraviolet light generation apparatus comprising: a droplet supply device configured to contain a droplet material and successively supply droplets; a charging electrode disposed between the droplet supply device and the plasma generation region, the charging electrode being configured to control charging of droplets supplied from the droplet supply unit; and a target controller configured to control electric polarities of the droplets supplied from the droplet supply unit by controlling potential of the charging electrode in such a way that successive droplets join together to become a target droplet, wherein the droplets controlled in charging by the charging electrode include a plurality of groups each composed of successive droplets, and, in each of the groups, a droplet at one end is charged positively or negatively, a droplet at the other end is uncharged or charged in a polarity being the same as a polarity of an adjacent droplet in a group adjacent to the droplet at the other end, and the successive droplets join together utilizing a change in speed caused by Coulomb force of the droplet at the one end to become a target droplet, and wherein, in each of the groups, only the droplet at the one end is charged and the other droplets are uncharged.