Conveners
Control Architecture and Strategies
- Benjamin Woolley (CERN)
Control Architecture and Strategies
- Zheqiao Geng (PSI - Paul Scherrer Institut)
Control Architecture and Strategies
- Zheqiao Geng (PSI - Paul Scherrer Institut)
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Dmitry Teytelman (Dimtel, Inc.)10/13/26, 4:15 PMControl Architecture and StrategiesOral
Bunch-by-bunch feedback control of coupled-bunch instabilities in the last 30 years became a ubiquitous feature of storage rings, both light sources and colliders. In my talk I will introduce the formalism of coupled-bunch instabilities and bunch-by-bunch feedback. Next, I will describe in detail the technology that these feedback systems rely upon. Using measurements from a number of real...
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Jon Vivas (University of the Basque Country EHU)10/13/26, 4:55 PMControl Architecture and StrategiesOral
Magnetrons offer high energy efficiency, making them attractive power sources; however, their RF output lacks the phase and amplitude stability required for high-precision applications like particle accelerators. While techniques like RF signal injection have been explored to stabilize magnetron outputs, this research introduces a Low-Level RF (LLRF) control framework designed to enhance...
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Xianghe Fang (INFN-LNF)10/13/26, 5:25 PMControl Loop Modeling, Tuning and OptimizationOral
Beam-driven plasma wakefield accelerators impose extremely stringent requirements on RF phase stability to ensure reliable beam generation and synchronization. At SPARC_LAB, a fast RF feedback system has been developed for the S-band RF power plant to satisfy the facility's synchronization requirement of less than 20 fs RMS phase jitter with respect to the reference master oscillator (RMO)....
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Bartosz Bielawski (CERN)10/13/26, 5:55 PMControl Architecture and StrategiesOral
The CERN Linac4 low-level RF relies on an adaptive feed-forward (AFF) to correct the beam-loading transient that the field feedback (PI or LQG) cannot remove within a single pulse. The AFF learns a correction from the field error of previous pulses and reduces the beam loading at the batch start to below 0.4%, a factor of two better than the specification. Over several years of operation we...
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Bruno Valentin Seifert (CERN)10/14/26, 1:45 PMControl Architecture and StrategiesOral
RF conditioning of accelerating cavities and power couplers is required to reach nominal operating voltage. High field gradients trigger multipacting and outgassing, which raise the vacuum pressure and limit the RF power that can be applied before arcing occurs. For efficient and safe conditioning, a feedback loop keeps the drive inside the optimal zone where vacuum activity is provoked but...
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Borut Baricevic (Instrumentation Technologies d.o.o)10/14/26, 2:45 PMControl Hardware PlatformsOral
Achieving high RF field stability in accelerating cavities driven by microsecond-scale pulses remains a challenge for modern LLRF systems. The short pulse duration limits the implementation of conventional FPGA-based intra-pulse feedback, while pulse-to-pulse correction alone cannot fully compensate for phase perturbations introduced by the high-power RF chain.
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An implementation of this novel... -
Dmitry Teytelman (Dimtel, Inc.)10/14/26, 3:15 PMControl Architecture and StrategiesOral
Modern diffraction-limited storage ring light sources run at high beam currents and use harmonic cavities to lengthen the bunches for increased lifetime. These features make feedback control of the longitudinal coupled-bunch instabilities very challenging due to the bunches' wideband and variable dynamics. In the last few years, the long-ignored idea of using a differentiator as the feedback...
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