NEUTRON VACUUM TUBE Russian patent published in 2008 - IPC G21G4/02 H05H3/06 H05H5/03 

FIELD: generation of fast pulsating neutron fluxes; small-sized sealed-off acceleration tubes; acceleration engineering and geophysical instrumentation engineering.

SUBSTANCE: proposed neutron vacuum tube that can be used for instance in commercial neutron impulse generators for investigating wells by way of pulsating neutron logging has target inside vacuum-sealed shell saturated with heavy isotopes of hydrogen, ion-optic electrode set for generating and accelerating ion beam, means for maintaining working pressure, and arcing ion source. Ion source has cathode, anode, and igniter electrode, as well as cylindrical permanent magnet setting up heterogeneous axial magnetic field around anode and ion source disposed coaxially to electrodes. Flat axially saturated permanent magnet is disposed directly under ion source cathode. Cylindrical permanent magnet producing axially heterogeneous magnetic field and flat axially saturated permanent magnet are facing one another by unlike-polarity poles.

EFFECT: enhanced operating stability of ion source which enhances stability of neutron flux and extends service life of neutron vacuum tube.

3 cl, 1 dwg