Abstract
A uniform focusing system and corresponding sheet beam electron gun for a 140 GHz staggered double vane traveling wave tube (SDV-TWT) were exhibited in this paper. The sheet beam electron gun generates electron beam with properties of voltage 25 kV, current 250 mA and beam size of 0.75 × 0.15 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . Simulation results demonstrate that a low uniform permanent magnetic field (UP) of 3400 Gs could focus the sheet beam in the beam tunnel of 1.6 ×0.24 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . And the sheet beam could travel 100 mm stably with a transportation rate of 100 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">%</sup> , with good shape and laminarity.
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