How is the electric field zero inside the deesof a cyclotron ?
And how is electric field present only in between the dees to accelerate the charged particle ?

Please Explain
Thanks In Advance

Metal dees acts as a shield and due to this electrical shielding effect of dees, the space within each is a region of zero electric field. ​The particle  gets accelerated by electric field  each time it passes through between the dees.When the particle moves from one dee to another, it is acted upon by electric field. Electric field changes sign ulternately. Therefore the particle is accelerated by the electric field, which increases the energy of the particle.

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The dees of cyclotron are made up of metals. And, it is a well known fact that electric field inside a metal is zero - so that's why no electric field exists inside the dees.
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the dees are metallic conductor hence no electric field inside whereas there is electric field outside a metallic conductor
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