Ushakov, A.; Neumann, A.; Echevarria, P.: RF system on a chip: a compact controller for SRF cavity field and detuning control. In: Ralph Assmann [Ed.] : IPAC'23 : Proceedings of the 14th International Particle Accelerator Conference ; Venice, Italy from 7 to 12 May 2023Geneve: JACoW, 2023. - ISBN 978-3-95450-231-8, p. THPL047/1-3
https://accelconf.web.cern.ch/ipac2023/pdf/THPL047.pdf
Open Access Version
Abstract:
For SRF cavity systems operated in continuous wave (CW) at low effective beam loading as in Energy Recovery Linacs or Free Electron Lasers with rather low beam cur-rent, control of the tuning and counteracting any detuning caused by microphonics or Lorentz force driven coupled ponderomotive instability is mandatory to deliver and pre-serve a stable beam in longitudinal phase space regime. To develop beyond the currently employed mTCA based LLRF systems, a compact RF on a chip system was devel-oped, which features several potential applications. Those range from a digital PLL to test and characterize the RF performance of cavities to a selection of detuning control algorithms, we have worked on it recent years, as e.g. a Kalman filter based state estimator controller [1] or an adaptive feedforward algorithm [2]. Here, we will show our first experimental findings with a TESLA style nine-cell SRF cavity operated in CW at our horizontal test facility HoBiCaT.