Abstract:
PROBLEM TO BE SOLVED: To improve efficiency of conversion of electrical energy to radiation. SOLUTION: To improve conversion efficiency of a radiation source including an anode and a cathode, the anode and the cathode being configured and arranged to create a discharge in a substance in a space between the anode and cathode and to form plasma so as to generate electromagnetic radiation, the radiation source unit is constructed to have a low inductance and to operate with a minimum of plasma. To improve heat dissipation, a fluid circulation system is created within the radiation source space and a wick by using a fluid in both its vapor and liquid phases. To prevent contamination from entering a lithographic projection apparatus, the radiation source unit is constructed to minimize the production of contamination, and a trap is employed to capture the contamination without interfering with the emitted radiation. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a radiation source that improves the conversion efficiency of electric energy into radiation. SOLUTION: A radiation source unit comprises an anode and a cathode that are configured and arranged to create discharge in a substance in a space between the anode and the cathode to form plasma so as to generate electromagnetic radiation. The liquid may comprises xenon, indium, lithium, tin, or an arbitrary suitable material. In order to improve the conversion efficiency, the radiation source unit is constructed to have low inductance and operated with the minimum of plasma. In order to improve heat dissipation, a liquid circulation system is created in the radiation source space and a wick by using a fluid in both vapor and liquid phases. In order to prevent contamination from entering a lithographic projection apparatus, the radiation source unit is constructed to minimize the generation of contamination, and a trap is employed to capture the contamination without interfering with the emitted radiation. COPYRIGHT: (C)2004,JPO
Abstract:
PROBLEM TO BE SOLVED: To remove unwanted contaminants generated by a radiation source. SOLUTION: Contaminant particles which move together with a projected beam are ionized. A purge gas can be attracted toward a gettering plate provided on the upstream of a purge gas supply source. The ionization of the purge gas is improved, by enclosing electrons generated by an ionizing device by means of a magnetic field. The contaminant particles can be ionized, by generating a plasma in a pipe having a larger length than its width.
Abstract:
PROBLEM TO BE SOLVED: To provide a radiation source that actualizes an output level and a repetition rate suitable for manufacturing. SOLUTION: A radiation source comprises an anode and a cathode that are configured and arranged to create a discharge in a gas or a vapor in a space between the anode and cathode for forming a plasma so as to generate electromagnetic radiation. The gas or vapor may contain xenon, indium, lithium and/or tin. To improve heat dissipation, the radiation source comprises multiple plasma discharge elements, each of which is used only for short intervals. After one discharge element is used, another discharge element is selected. To improve an exact timing of pinch formation and thus that of pulse of EUV radiation, the radiation source comprises a triggering device. To improve conversion efficiency, the radiation source is configured to have a low inductance, and operates in a self-triggering mode. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To remove a deposit on an optical element such as a radiating condenser of an aligner. SOLUTION: In a method for cleaning a deposit of the radiating condenser; a collector assembly has a radiating condenser, a cover plate, and a support for connecting the radiating condenser to the cover plate. The cover plate is provided so as to cover the opening of a collector chamber 48. The opening may be large enough to allow the passage of the radiating condenser and the support. The radiating condenser is cleaned by different cleaning processing. This processing is performed by a cleaner. The cleaner may include a surrounding cover designed to form a storage capacity surrounding at least the radiating condenser, an inlet configured to supply at least one of cleaning gas and a cleaning solution to the storage capacity to clean at least the radiating condenser, and an outlet configured to remove at least one of the cleaning gas and the cleaning solution from the storage capacity. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a radiation source in which an output level and a repeating speed that are suitable for production are realized. SOLUTION: The radiation source comprises an anode 220 and a cathode 210 that are configured and arranged to create a discharge in a gas or vapor in a space between the anode 220 and cathode 210 to form a plasma pinch so as to generate electromagnetic radiation. The gas or vapor may comprise xenon, indium, lithium, and tin. In order to improve heat dissipation, the radiation source LA comprises a plurality of plasma discharge elements 240, each of which is only used for short intervals, after which another discharge element is selected. COPYRIGHT: (C)2004,JPO
Abstract:
A radiation source comprises an anode and a cathode for creating a discharge in a gas or vapor in a space between anode and cathode and to form a plasma of a working gas or vapor so as to generate electromagnetic radiation. The cathode comprises a hollow cavity having an aperture that has a substantially annular configuration around a central axis of said radiation source for initiating the discharge. A driver gas or vapor is supplied to the cathode cavity and the working gas or vapor is supplied in a region around the central axis in between anode and cathode. The working gas or vapor may comprise xenon, lithium vapor and tin vapor.
Abstract:
Contaminant particles travelling with a projection beam in a lithographic projection apparatus are ionized. A purge gas may be attracted towards getter plates provided upstream of the purge gas supply. A magnetic field traps electrons generated by the ionizer to improve the ionization of the purge gas. The contaminant particles can be ionized by generating a plasma in a tube having a greater length than width.