The application discloses a high-energy outgoing
electron protection device for a
neutral beam injection negative
ion source, belongs to the field of the
neutral beam injection negative
ion source of magnetic confinement
nuclear fusion, and mainly comprises a protection plate, a supporting base, a
thermocouple and an
infrared thermal imager. The protection plate is used for intercepting high-energy outgoing electrons. The supporting base is used for mounting and positioning the protection plate in a beam line
vacuum chamber. The
thermocouple is used for realizing real-time monitoring of the local temperature of the protection plate. The
infrared thermal imager is used for observing a large-area heat source of the protection plate and determining the
heat deposition position distribution of the high-energy outgoing electrons. The application realizes protection of
heat load sensitive components such as a cryogenic pump by intercepting the high-energy outgoing
electron beam and monitoring the deposition position of the high-energy outgoing
electron beam, promotes the
performance improvement and scheme perfection of an electron suppression means, is favorable for long-pulse stable operation of the negative
ion source, and can effectively protect the high-energy outgoing electron in the
neutral beam injection negative
ion source.