3D model of the WSBK beam transport structure (electron gun, drift tube, and PCM).
Electron gun model. (a) 3D view. (b) FE. (c) Cylindrical cathode.
Electrostatic field vector plot (L) and spatial particle distribution (R) of the sheet beam gun (CST-PS). (a) Top view ( plane); (b) side view ( plane).
2D particle distributions at the cross-sectional planes (CST-PS) cathode surface, (b) , (c) , and (d) .
2D axial magnetic field distribution from (a) CST PARTICLE STUDIO, (b) MAXWELL3D, and (c) OMNITRAK.
1D distance vs axial magnetic field graph along the tunnel axis, obtained from CST-PS, MAXWELL3D, and OMNITRAK.
Beam transport system simulation sequence. (a) Focusing magnet model for magnetic field transfer to (b) electron-gun and drift-tube model.
Remanence magnetic flux density (Br) vs beam transmission graph (b) distance vs beam transmission graphs with and without anode flange.
Distance vs beam transmission with asymmetric and symmetric positions of the 1st transition iron pole-piece.
Beam transmission graph with respect to distance between the cathode and the first iron pole-piece (inset is the illustration indicating the cathode-PCM distance).
Simulation analysis result of completely designed WSBK transport system. (a) Static axial magnetic field distribution. (b) Emitted beam trajectory.
Cross-sectional plots of particle distribution at the axial distance of (a) 20 mm, (b) 50 mm, (c) 80 mm, and (d) 110 mm.
Axial distance vs beam transmission graph of completely designed WSBK beam transport system from the electron gun to the collector. The monitored transmission is more than 99.6%.
Electron beam distributions in and planes at , 10, 20, 30, 40, and 50 mm positions. (a) , (b) , and (c) .
Marginal probability distribution in the -direction (top) and -direction (bottom). (a) , (b) , and (c) .
Phase-space distribution at a point 1.4 mm upstream from the face of pole 1. (a) , (b) , and (c) .
(a) View normal to long direction of the beam entering the magnet array, (b) view normal to the axis showing the magnetic field amplitude near the magnet entrance and projections of electron orbits through the full transport system.
Short-direction phase-space distributions at the end of the magnet stack . (a) Cold beam. (b) .
Beam voltage vs transmission graphs obtained from experiment and simulation (CST-PS and OMNITRAK).
Current and transmission.
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