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A 3-MeV radio frequency quadrupole (RFQ) has been developed as a front-end component of the Proton Engineering Frontier Project (PEFP) 100-MeV proton linear accelerator. Because the frequency and the field profile are very sensitive to the mechanical error of the RFQ vane, vane alignment is required before brazing. When the initial alignment was performed, it was noticed that the measured resonant frequency of each section was 3  4 MHz higher than the designed frequency of 349.336 MHz and that the field profiles deviated from the designed value. To understand the differences between the measured RF parameters and the designed values, we proposed an error analysis method. The proposed error analysis method included several types of mechanical errors in the RFQ structures and their effects. The study showed that all the vane tips of PEFP RFQ section 3 and section 4 had dimensional errors of .0.1 mm and that two major vanes were consistently shifted from their designed positions by ±0.05 . 0.10 mm. Those errors could be compensated for by using slug tuners. p눊 릲?릹


A 3-MeV radio frequency quadrupole (RFQ) has been developed as a front-end component of the Proton Engineering Frontier Project (PEFP) 100-MeV proton linear accelerator. Because the frequency and the field profile are very sensitive to the mechanical error of the RFQ vane, vane alignment is required before brazing. When the initial alignment was performed, it was noticed that the measured resonant frequency of each section was 3  4 MHz higher than the designed frequency of 349.336 MHz and that the field profiles deviated from the designed value. To understand the differences between the measured RF parameters and the designed values, we proposed an error analysis method. The proposed error analysis method included several types of mechanical errors in the RFQ structures and their effects. The study showed that all the vane tips of PEFP RFQ section 3 and section 4 had dimensional errors of .0.1 mm and that two major vanes were consistently shifted from their designed positions by ±0.05 . 0.10 mm. Those errors could be compensated for by using slug tuners. p눊 릲?릹