Patent ID: 7435958
Filing Date: 2008-10-14
Classification: H01J

Abstract:
1. A specimen chamber for an electron beam apparatus comprising a mirror barrel for housing a magnetic lens for converging an electron beam onto a specimen, said specimen chamber for housing said specimen, said specimen chamber comprising: a main body comprising a non-magnetic material having conductivity, comprising a plurality of rounded inner corners, and comprising a bottom and sidewalls integrally formed by engraving and milling, and an inner plate made from a highly magnetic permeable material inside of said sidewalls, wherein said sidewalls of said main body have a thickness of at least 35 mm for reflecting and attenuating an AC magnetic field of an environmental magnetic field, and wherein said inner plate has a thickness of at least 1 mm for absorbing, or allowing to pass through, part of the AC magnetic field and a DC magnetic field of said environmental magnetic field.