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Vital part of the storage ring, the RF system provides the accelerating field for the electron beam. The electromagnetic energy, generated by the RF power amplifiers, is transferred to the electron bunches each time they pass through the accelerating cavities. The brightness of the beam can be limited by oscillations of the electron bunches, excited by the high order modes (HOM) of the cavities. The use of superconducting cavities makes the damping of these parasitic modes easier, and therefore helps improving the beam stability. The SOLEIL cryomodule relies on a "home made" design, based on a pair of cavities inside a single cryomodule. Four HOM couplers located on their connection tube provide a strong attenuation of the HOM impedances and couple out the induced HOM power without disturbing the accelerating mode.
Each of the four cavities is powered by one 190 kW solid state amplifier - also developed at SOLEIL (see news of January).
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