
#1
Dec812, 06:08 AM

P: 1

hi;
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
Dec812, 11:56 AM

Mentor
P: 10,813

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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