Patent ID: 8426835

Claim:
A charged particle radiation device having a charged particle source, an extraction electrode for extracting charged particles from the charged particle source, a sample holding means for holding a sample to be irradiated with charged particles extracted by the extraction electrode, a charged particle optical system for irradiating the sample held on the sample holding means with the charged particles that are extracted, a first evacuation means for evacuating a first vacuum chamber in which the charged particle source is arranged, and a second vacuum chamber, independent of the first vacuum chamber, for evacuating a second vacuum chamber connected to the first vacuum chamber, the charged particle radiation device further having: a shielding electrode of a cylindrical structure that is so arranged as to surround the charged particle source and shield against the procession of back scattered charged particles from the extraction electrode, wherein: the top end and the bottom end of the cylinder of the cylindrically structured shielding electrode are open to the inside of the first vacuum chamber.