MICROWAVE PLASMA APPLICATOR WITH IMPROVED POWER UNIFORMITY

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United States of America Patent

APP PUB NO 20150279626A1
SERIAL NO

14226994

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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An apparatus for generating plasma includes a plasma discharge tube and a conductive coil helically wound around an outer surface of the plasma discharge tube. A waveguide is coupled to a microwave cavity surrounding the plasma discharge tube to guide the microwave energy into the plasma discharge tube such that the plasma is generated in the plasma discharge tube. The waveguide is positioned such that an electric field of the microwave energy is oriented at a predetermined angle with respect to the longitudinal axis of the plasma discharge tube. A resulting induced electric current in the conductive coil affects power absorption in the plasma discharge tube, the predetermined angle being selectable such that power absorption in the plasma discharge tube is according to a predetermined profile with respect to the longitudinal axis of the plasma discharge tube.

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Patent Owner(s)

Patent OwnerAddress
MKS INSTRUMENTS INC2 TECH DRIVE SUITE 201 ANDOVER MA 01810

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Chen, Xing Lexington, US 193 4664
Ji, Chengxiang Winchester, US 4 45
Madden, Erin Lynnfield, US 2 17
Pokidov, Ilya North Reading, US 17 93
Wenzel, Kevin W Belmont, US 13 126

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