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Package
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Trak Charged Particle Toolkit
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Input files
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AsterixBeams.min, AsterixBeams.ein, AsterixBeams.tin, AxialDist.png, Orbits.png, rod_pinch_experiments.pdf
Download AsterixPinchedBeam.zip
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Description
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Simulation of high voltage experiments in the Asterix accelerator. The goal was to generate an intense electron beam pinched to a small spot for pulsed radiography. This calculation demonstrates several unique features of Trak, including modeling of self-consistent beam-generated magnetic fields and counter-streaming electron/ion flow. The presence of ions is critical to achieving a tight pinch.
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Results
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The input files describe diode operation with a 2.0 mm diameter anode with an applied voltage of 5.8 MV. The total current is 122.37 kA. The electron current is 93.86 kA and the proton current is 28.51 kA. The values are in good agreement with the peak operational level of the reported experiments. The fraction of ion current is much higher than that in a simple diode because the electrons follow complex orbits in the strong magnetic field. The top figure shows selected electron trajectories (left) compared to the simple streaming trajectors of ions (right). The lower figure shows the axial distribution of impact electrons on the anode rod. |
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Comments
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The research paper, Radiographic results for the rod-pinch diode scaled up to 6 mv, F.C. Young, et.al. is included input files and is available at https://apps.dtic.mil/sti/tr/pdf/ADA636513.pdf. |
