Speaker
Description
TESLA 9-cell elliptical cavities are used in the accelerators of the European XFEL and LCLS-II. The high duty cycle upgrade study for EuXFEL and the LCLS-II-HE program target loaded Quality factors of 6e7 and beyond, leading to RF cavity half bandwidths below 11Hz. Stable operation in these conditions heavily relies on active RF resonance control, as required RF drive power to maintain amplitude and phase lock surpasses amplifier max ratings if detuning is not compensated.
To counteract mechanical vibrations, e.g. introduced by rotational machines in the proximity of the accelerating modules, a dedicated narrowband active noise control algorithm was introduced in previous work. This proceeding presents CPU based implementations and latest test results obtained at the Cryomodule Test Bench (CMTB) at DESY and LCLS-II at SLAC, where the stable operation gradient of a cavity could be increased from 9 to 15MV/m without violating RF control limits.
Funding Agency
This work was partially funded in the context of the R&D program of the EuXFEL and received funding from the EU Horizon Europe research and innovation program under grant agreement N.~101131435.
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