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The SIS100 heavy-ion synchrotron under construction at GSI/FAIR will contain a total of 4 broadband cavities for barrier bucket and longitudinal feedback operation. These need to generate non-harmonic gap voltages with relevant spectral components in a range from 100 kHz to 15 MHz. Previous analyses showed that the input capacitance of the tetrode amplifier limits the cavity’s upper cutoff frequency. To counteract this effect, the load impedance at the input of the tetrode amplifier shall be reduced from 50 ohms to 12.5 ohms at the expense of more driver amplifier power. In this case, achieving 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 by measurement.
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