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High current density results from a LaB6 thermionic cathode electron gun

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2 Author(s)
Herniter, M.E. ; Coll. of Eng. & Technol., Northern Arizona Univ., Flagstaff, AZ, USA ; Getty, W.D.

A Pierce-type electron gun using a planar 1.9-cm-diameter lanthanum hexaboride cathode is being studied as a robust thermionic emitter at high cathode-current densities. The gun has been operated up to voltages of 115 kV, achieving beam current densities of 30 A/cm2 . The electron gun operated dependably up to 90 kV, achieving temperature-limited currents of 50 A. Due to the high fields at the tip of the Pierce-focusing electrode, the gun would usually arc at voltages >90 kV. Ten shots were obtained at a gun voltage of 115 kV, achieving transmitted currents up to 89 A, transmitted beam power up to 10.2 MW, and transmitted power densities up to 3.4 MW/cm2

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Plasma Science, IEEE Transactions on  (Volume:18 ,  Issue: 6 )