โ Scribed by R.J. Bosca; D.L. Weathers
No coin nor oath required. For personal study only.
When a transverse electric field between a pair of closely spaced electrodes is used to deflect an ion beam, the length of the field region along the beam axis directly affects the length of time required to make the transition between the beam's undeflected and deflected states. Using the SIMION TM 3D 7.0 ion optics simulation program, which calculates electrostatic fields via numerical solutions to Laplace's equation, a deflector of this type has been modeled for fast-pulsing a keV ion beam. Electric fields calculated in the model were used to simulate ion flight through the deflection region. By establishing a condition for ion transmission and by starting ion flights at different positions along the beam axis in the electric field region, the time dependence of the beam's transition from the undeflected to the deflected state was obtained. The simulated deflection is in good agreement with the measured performance of a deflection system on a Cockcroft-Walton accelerator. Other simulated slit configurations are also investigated that reduce the length of the fields along the beam axis, thus optimizing the pulsing mechanism.
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