COMMISSIONING RESULTS FROM THE LEDA LOW-ENERGY DEMONSTRATION ACCELERATOR (LEDA) RADIO-FREQUENCY QUADRUPOLE (RFQ)

The LEDA RFQ is a 100% duty factor (CW) linac that delivers >100 mA of H + beam at 6.7 MeV. The 8-m-long, 350-MHz RFQ structure accelerates a dc, 75-keV, 110mA H + beam from the LEDA injector with ~94% transmission. After the ~200-µsec-long turn-on transient, RFQ output beams with currents >90 mA have RFQ transmission that is ~10% lower than the PARMTEQM prediction. Raising the rf cavity field level to 105-110% of the design field increases the RFQ transmission to the design value. Preliminary analysis of the 93-mA quadscan data suggests the RFQ output beam rms emittance, ex ≈=0.25 π mm mrad (normalized), is less than the measurement error away from the design, 0.23 π mm mrad.

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