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Electron beam transport analysis of W-band sheet beam klystron
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Image of FIG. 1.
FIG. 1.

3D model of the WSBK beam transport structure (electron gun, drift tube, and PCM).

Image of FIG. 2.
FIG. 2.

Electron gun model. (a) 3D view. (b) FE. (c) Cylindrical cathode.

Image of FIG. 3.
FIG. 3.

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).

Image of FIG. 4.
FIG. 4.

2D particle distributions at the cross-sectional planes (CST-PS) cathode surface, (b) , (c) , and (d) .

Image of FIG. 5.
FIG. 5.

2D axial magnetic field distribution from (a) CST PARTICLE STUDIO, (b) MAXWELL3D, and (c) OMNITRAK.

Image of FIG. 6.
FIG. 6.

1D distance vs axial magnetic field graph along the tunnel axis, obtained from CST-PS, MAXWELL3D, and OMNITRAK.

Image of FIG. 7.
FIG. 7.

Beam transport system simulation sequence. (a) Focusing magnet model for magnetic field transfer to (b) electron-gun and drift-tube model.

Image of FIG. 8.
FIG. 8.

Remanence magnetic flux density (Br) vs beam transmission graph (b) distance vs beam transmission graphs with and without anode flange.

Image of FIG. 9.
FIG. 9.

Distance vs beam transmission with asymmetric and symmetric positions of the 1st transition iron pole-piece.

Image of FIG. 10.
FIG. 10.

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).

Image of FIG. 11.
FIG. 11.

Simulation analysis result of completely designed WSBK transport system. (a) Static axial magnetic field distribution. (b) Emitted beam trajectory.

Image of FIG. 12.
FIG. 12.

Cross-sectional plots of particle distribution at the axial distance of (a) 20 mm, (b) 50 mm, (c) 80 mm, and (d) 110 mm.

Image of FIG. 13.
FIG. 13.

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%.

Image of FIG. 14.
FIG. 14.

Electron beam distributions in and planes at , 10, 20, 30, 40, and 50 mm positions. (a) , (b) , and (c) .

Image of FIG. 15.
FIG. 15.

Marginal probability distribution in the -direction (top) and -direction (bottom). (a) , (b) , and (c) .

Image of FIG. 16.
FIG. 16.

Phase-space distribution at a point 1.4 mm upstream from the face of pole 1. (a) , (b) , and (c) .

Image of FIG. 17.
FIG. 17.

(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.

Image of FIG. 18.
FIG. 18.

Short-direction phase-space distributions at the end of the magnet stack . (a) Cold beam. (b) .

Image of FIG. 19.
FIG. 19.

Beam voltage vs transmission graphs obtained from experiment and simulation (CST-PS and OMNITRAK).


Generic image for table
Table I.

Current and transmission.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Electron beam transport analysis of W-band sheet beam klystron