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Solving by finite difference method

  1. Dec 8, 2012 #1
    I have 3 hyperbolic electrodes ,one as a ring and 2 others as endcap
    electrodes which have potential v and 0 respectively.(quadrupole ion trap)
    I want to solve potential inside the trap by finite difference method.

    I don't know how general equations for unshaped materials will change , If I truncate my shape .
    I don't know how to determine the magnitude of nodes which are on truncated line or exactly before that?

    please help me
    thanks a lot
  2. jcsd
  3. Dec 8, 2012 #2


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    2017 Award

    Staff: Mentor

    Where do you truncate your shape?
    If the field is not too far away from uniform, you can assume a uniform field (in direction of the border) as boundary condition.
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