[quote author=Fu-Kwun Hwang link=topic=33.msg7438#msg7438 date=1287740821]
[quote author=Zahraa link=topic=33.msg7436#msg7436 date=1287723437]
thank you again ...

but all the articles I have read about the cyclotron say : that the charged particles is effected with tow filed in the gap
magnetic and electric one ..

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Can you provide reference to the articles you read? Or copy the full text in detail?
[/quote]

see these pictures and notice that  the magnetic filed cross the gap.