Radio Frequency Quadrupole Accelerating Structure Research at los Alamos

Radiofrequency Quadrupole Accelerators and Their Applications

“…In a practical RFQ accelerator, a method must be found for exciting the four poles to produce the desired standing-wave electric field distribution to meet the beam requirements. RFQ accelerators have been built and operated using a variety of resonant cavities, such as the four-vane (6,12), the double-H (10), the split-coaxial (63), and the four-rod (64) geometries, including the spiral-loaded ( 65) and a multiple lumped-inductor resonator (39). Of these, the four-vane, bec .…”

“…For the four-vane resonator, the dipole-mode interference was the most serious problem in the early development stages, induced mostly by small transverse vane positioning errors (12). One important contribution was the introduction of vane-coupling rings (66,67), which provide low-imped-ance conducting paths between opposite poles (without interfering with the beam).…”

“…In the Los Alamos Accelerator Technology Division, a decision was made to test the RFQ principle for possible application in several future accel erator programs whose objective was the development of high-current, low-emittance ion beams. In early 1979, initial work on RFQ beam dynam ics design and on rf structure design was reported at the 1979 Particle Accelerator Conference by Stokes et al (11) and by Potter et al(12). Later in 1979, at the Montauk Linac Conference, there were several papers on Los Alamos RFQ development.…”