Investigations on the vacuum current in the magnetic insulated Karlsruhe light ion facility high-energy linear induction accelerator (KALIF–HELIA)

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Abstract
In order to increase the applied voltage in pulsed power ion diodes, the Karlsruhe light ion facility will be extended by a voltage adder. An important problem with such a device is how the electron loss current can be controlled in the vacuum feed. Based on a static, one-dimensional analytic model and two-dimensional particle-in-cell (PIC) simulations, a detailed knowledge of the electron flow in the voltage adder is obtained. Time-dependent simulations support qualitatively the observation of laminar electron flow. The electrons form a band corresponding to the section on which they originate. It is demonstrated that with the introduction of guard rings, appropriately positioned in the feed, the electron loss current can be reduced by more than 50%.

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