Göttingen 2025 – scientific programme
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 4: AKBP Posters
AKBP 4.2: Poster
Tuesday, April 1, 2025, 16:30–18:00, ZHG Foyer 1. OG
Development of a 4:1 Guanella-type Impedance Transformer for the future SIS100 Broadband Cavity Systems — •Christoph Julien Wegmann1 and Harald Klingbeil1,2 — 1Fachgebiet Beschleunigertechnik, Technische Universität Darmstadt, 64289 Darmstadt, Deutschland — 2Abteilung Ring RF Systems, GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Deutschland
Most particle accelerator cavity systems like e.g. the acceleration cavities focus on generating a harmonic voltage of a given frequency. The SIS100 heavy ion synchrotron under construction at GSI/FAIR will also contain broadband cavity systems generating signals with significant spectral components in a range from 100 kHz to 20 MHz.
Previous analyses have shown that designing a suitable transmission path leads to multiple serious challenges. One of these is that the input capacitance of the tetrode amplifier limits the upper cutoff frequency. To counteract this effect, the load impedance at the input of the tetrode amplifier can be reduced from 50 Ω to 12.5 Ω at the expense of more driver amplifier power. However, to achieve an impedance matching to the driver amplifier necessitates the inclusion of a transformer generating a broadband 4:1 impedance transformation over the entire relevant frequency range.
A Guanella-type 4:1 ferrite transmission line transformer meeting these requirements was developed, built and verified. The core operating principles, approaches and measurement results are presented.
Keywords: RF systems; MA-loaded cavity; Impedance matching; Transformer; Transmission line