Loop coupling to a radio frequency quadrupole resonator (RFQ)

Providing radio frequency energy to an RFQ resonator using a coupling loop instead of a slot gives more freedom in vane size design (smaller space occupied by the loop) and the possibility of tight coupling to ease operational problems. Included is a discussion of various techniques to eliminate or separate the TE110 mode from the desired TE210 mode. Results on a model designed to test these techniques will be discussed