Neumann, A.; Anders, W.; Frahm, A.; Goebel, F.; Heugel, A.; Klauke, S.; Knobloch, J.; Schuster, M.; Tamashevich, Y.: RF Conditioning of 120 kW CW 1.3 GHz High Power Couplers for the bERLinPro Energy Recovery Linac. In: Kenji Saito ... [Ed.] : SRF2021 : Proceedings of the 20th International Conference on RF Superconductivity, virtuell, 27 June 2021 to 2 July 2021Geneve: JACoW, 2021. - ISBN 978-3-95450-233-2, p. MOPTEV007/1-5
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Abstract:
This year, the commissioning of the 50 MeV, 100 mA bERLinPro Energy Recovery Linac test facility [1] will resume. For the Booster cryo-module of the injector line, operated with three modified 1.3 GHz Cornell style 2-cell SRF cavities, a new type of power coupler was developed, based on KEK’s C-ERL injector coupler. Modifications were made for a stronger coupling and lower emittance diluting coupler tip variant, a so-called "Golf Tee" shape and the cooling concept was redesigned based on KEK’s first experiences. For the final stage, the injector needs to deliver a low emittance beam of 100 mA average beam current at 6.5 MeV. That results in a traveling and continuous wave forward power requirement of up to 120 kW each of the twin setup feeding one Booster cavity. In this contribution we will give a short overview of the RF design and its impact on the beam’s emittance, give an overview of the conditioning teststand and the results achieved with the first pairs of couplers.