White Papers

Beam Spot Size as a Function of Excitation Levels of Magnetic Quadrupoles

This paper will present an overview of the focusing properties of magnetic quadrupoles and show how beam spot size can be visualized using arc segment emitters. We will also show how parametric variation of the excitation current can be used to determine the optimum level for minimum spot size at points along the beam axis. Some other concepts discussed in this white paper:

  • Rays launching from the perimeter of an emitter surface provide a fast efficient method of computing spot size.
  • Parametric variation of magnet excitation to determine the optimal level for obtaining minimum spot size at points along the beam axis.


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