Development of high current density sheet beam electron gun for Terahertz devices

The development of high current density sheet beam electron gun for Terahertz devices is carried-out. It operates at beam voltage of 12 kV and perveance 0.0136 μp to meet ours requirement of high beam current density 100 A/cm
²
and low emittance 0.068 π-mm-mrad at the beam—waist position. Currently, mentioned gun is being fabricated. Work has been initiated to test the performance of Scandate cathode using anode—aperture mapping. Current density of 50 A/cm2 has been ensured across the beam cross-section of 100 × 600 μm
²
.