Hi,
I'm Vo Thanh Minh Tue, Nus High School, Singapore. The Java Applet for the cyclotron is very interesting. I note that there are different meanings of the term "cyclotron frequency" in physics text. In some American textbooks (such as Serway's Physics for Scientist and Engineering and Hyper Physics Forum), cyclotron frequency refers to the angular frequency of the square wave of electric field applied between the dees. Hence, the angular frequency of the electric field matches the angular velocity of the particle: w=qB/m.
Thank you very much,
Vo Thanh Minh Tue.