Patent ID: 8659229
Filing Date: 2014-02-25
Classification: H01J

Abstract:
1. A method of modifying plasma density within an enclosure, said enclosure having a first side having an extraction slit and having a length, a width and a depth, where length is defined as the dimension parallel to said extraction slit, and width is defined as planar with said first side and perpendicular to length, said method comprising: disposing an antenna, comprising a plurality of connected coil segments, against a second side of said enclosure to create a plasma within said enclosure; and placing an attenuating material near said antenna, such that said antenna is disposed between said attenuating material and said second wall, such that said attenuating material is sized so as to cover a portion of one dimension of said antenna, such that said attenuating material covers only a portion of each of said plurality of coil segments.