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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

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# Solving by finite difference method

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