München 2019 – wissenschaftliches Programm

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 15: Poster session

AKBP 15.8: Poster

Donnerstag, 21. März 2019, 16:30–18:00, Durchgangshalle

Frequency Tuning of the 325 MHz Ladder-RFQ — •Huifang Wang, Maximilian Schütt, and Ulrich Ratzinger — IAP, Goethe University Frankfurt

A Ladder-Type- RFQ has been built for the FAIR Proton-Linac operating at 325.224 MHz. The 3.4 m Ladder-RFQ will accelerate up to 100 mA protons from 95 keV to 3 MeV at a duty factor of 0.08%. To tune the frequency a total of 12 tuners are planned, which two of them are movable and ten static plungers. By simulations with Microwave Studio (CST MWS) the exact positions, the shape of the frequency tuners as well as the combination of the two movable tuners have been determined. Furthermore the mode-crossing of the tuner eigenmode and cavity mode has been studied. In addition, the longitudinal field distribution (Flatness) in the unmodulated RFQ was measured using the bead-pulling measurement with various beads, which are suitable for modulated electrode.