1. An apparatus for extracting intensity controlled charged particles from charged particles circulating in a synchrotron of a charged particle cancer therapy system, comprising: oscillation blades, said oscillation blades comprising a radio-frequency voltage across said blades during use, said radio-frequency inducing oscillating charged particles from the charged particles circulating in said synchrotron; an extraction material in said synchrotron, wherein the oscillating charged particles traverse said extraction material during use generating both reduced energy charged particles and secondary emission electrons; and extraction blades, said extraction blades extracting said reduced energy charged particles from said synchrotron.