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Package
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Trak Charged Particle Toolkit
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Input files
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PlanarElectronGun.min, PlanarElectronGun.ein, PlanarElectronGun.tin, PierceElectrodeCalculator.xls
Download PierceElectronGun.zip
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Description
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The goal is to simulate an ideal Pierce planar electron gun. The emission surface width is 2.0 cm, the cathode-anode spacing is 5.0 cm and the applied voltage is 1000 V. Symmetry is applied: the calculation models the upper half plane in y.
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Results
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The beam particles at the anode are parallel to within 0.05 degrees. The total current of 0.29504 A/m implies a current density of 2.950 mA/cm2. The prediction of the 1D Child-Langmuir law is 2.947 mA/cm2 |
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Comments
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The input files contain a useful spreadsheet to approximate the difficult geometry of the exit electrode for any choice of gap spacing D. The geometry was based on a Comsol example.
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