Controlling the flow through the collector during cleaning

Radiant energy – Irradiation of objects or material – Irradiation of semiconductor devices

Reexamination Certificate

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C250S503100, C250S50400H, C378S034000

Reexamination Certificate

active

07465943

ABSTRACT:
A lithographic apparatus includes a collector configured to collect radiation from a radiation source, the collector including a plurality of shells forming separate compartments, and a cleaning arrangement including a gas inlet and a gas outlet, the cleaning arrangement being configured to clean surfaces of the plurality of shells by guiding a gas flow from the inlet through the compartments to the outlet. The cleaning arrangement includes a distribution system configured to divide the gas flow into several sub flows, each of the sub flows corresponding to one or more of the compartments, and a control system configured to control the relative amount of the sub flows.

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