Proof-of-principle experiment of slow beam extraction from a synchrotron using a radio frequency knockout system with a broadband

A simulation study on an RFKO beam extraction has shown that the spill with the CN including many bands around the betatron resonances is clearly more uniform than that with the CN by one band. In order to realize this method, a prototype of the RF-knockout system with a frequency band of 1-14 MHz is developed for a proof-of-principle experiment at the WERC synchrotron. The beam experiment shows that a uniformity of spill intensity improves with the number of frequency band as predicted in the beam simulation. The standard deviation of spill fluctuation to the average value with ten bands becomes 57% of that with one band. (author)