Dresden 2020 – scientific programme

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 16: Posters

AKBP 16.7: Poster

Thursday, March 19, 2020, 16:30–18:00, P1C

RF Tuning of the 325 MHz Ladder-RFQ — •Maximilian Schuett, Marc Syha, and Ulrich Ratzinger — IAP, Goethe University Frankfurt, Germany

Based on the positive results of the unmodulated 325 MHz Ladder-RFQ prototype from 2013 to 2016, we developed and designed a modulated 3.4 m Ladder-RFQ*. The Ladder-RFQ features a very constant voltage along the axis, low dipole modes and easy field tuning opportunities. Furthermore, the Ladder-RFQ is completely maintainable and free of welding and soldering. The prototype accepted 3 times the operating power of which is needed in operation**. That level corresponds to a Kilpatrick factor of 3.1 with a pulse length of 200 µ s.

The 325 MHz Ladder-RFQ is designed to accelerate protons from 95 keV to 3.0 MeV according to the design specifications of the proton linac within the FAIR project. This particular high frequency for a 4-ROD-RFQ creates difficulties, which triggered the development of a Ladder-RFQ with its high symmetry. The results of the unmodulated prototype have shown, that the Ladder-RFQ is very well suited for that frequency. The duty cycle is up to 5% for the applied cooling concept. Tuning and the final machining step have been completed in April 2019. We will show low level RF measurements as well as frequency and field tuning opportunities with solid movable plungers.

*Journal of Physics: Conf. Series 874 (2017) 012048 **Proceedings of LINAC2016, East Lansing, TUPLR053