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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 15: Poster session

AKBP 15.10: Poster

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

RF Measurements and Tuning of the 325 MHz Ladder-RFQ — •Maximilian Schütt, 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 unmodulated Ladder-RFQ features a very constant voltage along the axis. It 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 0.2 ms. The 325 MHz RFQ is designed to accelerate protons from 95 keV to 3.0 MeV according to the design parameters 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. Manufacturing has been completed in September 2018. We will show the finalization of assembly after manufacturing as well as low level RF measurements. The final machining step for the flatness & frequency tuning is envisaged in spring 2019.

*Journal of Physics: Conf. Series 874 (2017) 012048 **Proceedings of LINAC2016, East Lansing, TUPLR053 Funded by BMBF 05P15RFRBA