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The horizontal injection section of the TRIUMF 500 MeV cyclotron has been replaced after 50 years of operation and the historic buncher configuration which consists of two separated double-gap bunchers for the 1st and 2nd harmonics of the cyclotron RF frequency of 23.06 MHz were successfully replaced with a multi-harmonic buncher operating on three harmonics. The novel multi-harmonic buncher structure has two electrodes and three gaps: one electrode driven with 1st and 3rd harmonics and the second electrode – with the 2nd harmonic. It is a combination of two double-gap structures having one common gap inside the cavity. The device is now installed and operational. The RF design, fabrication and commissioning results are presented and discussed in the article.
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