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There is one cylinder and one metal plate. help me calculation of electric field.

  1. May 3, 2012 #1
    i have to design one shielding box. in that there is cylinder having high volatage +60kev. and box having metal plate. so i have to calculate the electric field on that cylinder and then decide , what should be the distance in between plate and cylinder. i have attach the geometry on the file. please see it.
     

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  2. jcsd
  3. May 3, 2012 #2
    Could anyone help me ?
     
  4. May 3, 2012 #3

    mfb

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    Staff: Mentor

    Can you use some approximation, like d>>R?
    In that case, it should be possible to approximate the box as a cylinder, and calculate it like a cylindrical capacitor using Gauss' law (google should give you some ways to do this).

    If not, a numerical simulation might be the easiest way to solve your problem.
     
  5. May 3, 2012 #4
    yes, thanks ... bt i think i wl get that for cylindrical capacitor. bt right now i have another design.. bt i wl try for solving it.
    btw what type of numerical solution that i should use??



     
  6. May 3, 2012 #5
    For a cylinder and one metal plate, the capacitance per unit length is given by Smythe Static and Dynamic Electricity 3rd edition page 78:
    [tex] C=\frac{2\pi\epsilon}{cosh^{-1}\frac{h}{R}} [/tex]
    for cylinder of radius R with axis parallel to and at a distance h above an infinite plane. The problem of a cylinder between two conducting planes is given on page 105.
     
  7. May 5, 2012 #6

    mfb

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    A two-dimensional grid, for example. Use your favourite tool, plug in the boundary conditions for the potential Φ (box and circle) and the Laplace equation [itex]\nabla^2 \Phi = 0[/itex] in the vacuum (or air, as good approximation).

    In excel, the result can look like this (I did this for a cylinder over an infinite plane orthogonal to the cylinder axis, and it uses cylindrical coordinates).
     
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