RFQ'S in research and industry

The Radio Frequency Quadrupole accelerator (RFQ) has now matured to the point where it has found wide application. Many machines are in use as part of a synchrotron injector chain with others in unique and unusual applications. Several new RFQ's are now under construction or operating since the last survey. They are of various configurations, making use of various techniques of fabrication and field stabilization. Duty factors are being pushed up, new beam dynamics design techniques are to be used and emittance blow up mechanisms are better understood. Finally, RFQ's are moving from the laboratory to the commercial marketplace.