Claudio Rivetta
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View article: Smart dim fuse: electrical load flexibility controller using sub-circuit voltage modulation and load sensing
Smart dim fuse: electrical load flexibility controller using sub-circuit voltage modulation and load sensing Open
Improved control of electrical power consumption is provided with “Smart Dim Fuses” (SDF) which can alter their output voltage as provided to the load circuits they are connected to. SDF units can replace conventional circuit breakers in e…
View article: Identification of the Inter-Bunch and Intra-Bunch Beam Dynamics Based on Dynamic Modal Decomposition (DMD)
Identification of the Inter-Bunch and Intra-Bunch Beam Dynamics Based on Dynamic Modal Decomposition (DMD) Open
The quantification of the Inter-bunch and Intra-bunch beam dynamics is important to define monitoring and operation tools in accelerators as well as to design model-based controllers to stabilize the transversal and longitudinal beam motio…
View article: Optimal Operator Training Reference Models for Human-in-the-loop Systems
Optimal Operator Training Reference Models for Human-in-the-loop Systems Open
The human operator is an integral part of a stable and safe power system. While there is increasing attention paid to automation improvements, the importance of understanding and training human operators may be understated. This paper disc…
View article: The SPS Wideband Feedback Processor: A Flexible FPGA-Based Digital Signal Processing Demonstration Platform for Intra-Bunch Beam Stability Studies
The SPS Wideband Feedback Processor: A Flexible FPGA-Based Digital Signal Processing Demonstration Platform for Intra-Bunch Beam Stability Studies Open
A flexible digital signal processing platform based on FPGA technology has been developed for vertical intra-bunch beam stability studies at the CERN SPS. This system is unique in that samples at a very high rate (4GSa/s) in order to measu…
View article: Impact of a Wideband Feedback Prototype System on TMCI in the SPS
Impact of a Wideband Feedback Prototype System on TMCI in the SPS Open
The transverse mode coupling instability (TMCI) in the SPS has been identified as one of the potential performance limitations for future high intensity LHC beams that will be required for the High Luminosity (HL)-LHC era and is being addr…
View article: LCLS-II Gun/Buncher LLRF System Design
LCLS-II Gun/Buncher LLRF System Design Open
For a free electron laser, the stability of injector is critical to the final electron beam parameters, e.g., beam energy, beam arrival time, and eventually it determines the photon quality. The LCLS-II project's injector contains a VHF co…
View article: Recent Results from the Wideband Feedback System Tests at the SPS and Future Plans
Recent Results from the Wideband Feedback System Tests at the SPS and Future Plans Open
A high bandwidth transverse feedback demonstrator system has been devised within the LARP framework in collaboration with SLAC for the LHC Injectors Upgrade (LIU) Project. The initial system targeted the Super Proton Synchrotron (SPS) at C…
View article: Design and Implementation of the LLRF System for LCLS-II
Design and Implementation of the LLRF System for LCLS-II Open
The SLAC National Accelerator Laboratory is building LCLS-II, a new 4 GeV CW superconducting (SCRF) linac as a major upgrade of the existing LCLS. The SCRF linac consists of 35 ILC style cryomodules (eight cavities each) for a total of 280…
View article: High Precision RF Control for SRF Cavities in LCLS-II
High Precision RF Control for SRF Cavities in LCLS-II Open
The unique properties of SRF cavities enable a new generation of X-ray light sources in XFEL and LCLS-II. The LCLS-II design calls for 280 L-band cavities to be operated in CW mode with a Q_{L} of 4x10⁷, using Single-Source Single-Cavity c…
View article: 3D multiphysics modeling of superconducting cavities with a massively parallel simulation suite
3D multiphysics modeling of superconducting cavities with a massively parallel simulation suite Open
Radiofrequency cavities based on superconducting technology are widely used in particle accelerators for various applications. The cavities usually have high quality factors and hence narrow bandwidths, so the field stability is sensitive …
View article: Complex-coefficient systems in control
Complex-coefficient systems in control Open
Complex-valued dynamics can be used for modeling rotationally invariant two-input two-output systems and bandpass systems when they are considered in the baseband. In a few instances, control design has been done in the complex domain, whi…
View article: High Precision RF Control for the LCLS-II
High Precision RF Control for the LCLS-II Open
The LCLS-II is a CW superconducting linac under construction to drive an X-ray FEL. The energy and timing stability requirements of the FEL drive the need for very high precision RF control. This paper summarize the design considerations a…
View article: Control of Intra-Bunch Vertical Instabilities at the SPS - Measurements and Technology Demonstration
Control of Intra-Bunch Vertical Instabilities at the SPS - Measurements and Technology Demonstration Open
We present recent measurements demonstrating control of unstable beam motion in single bunch and bunch train configurations at the SPS. The work is motivated by anticipated intensity increases from the LIU and HL-LHC upgrade programs, and …
View article: Electro-Mechanical Modeling of the LCLS-II Superconducting Cavities
Electro-Mechanical Modeling of the LCLS-II Superconducting Cavities Open
The 4 GeV LCLS-II superconducting linac will contain 280, 1.3 GHz TESLA-style cavities operated CW at 16 MV/m. Because of the low beam current, the cavity bandwidth will be fairly small, about 32 Hz, which makes the field stability sensiti…
View article: Simulation Results of a Feedback Control System to Damp Electron Cloud Single-Bunch Transverse Instabilities In The Cern SPS
Simulation Results of a Feedback Control System to Damp Electron Cloud Single-Bunch Transverse Instabilities In The Cern SPS Open
Transverse Single-Bunch Instabilities due to the Electron Cloud effect are limiting the operation at high current of the SPS at CERN. Recently a high-bandwidth Feedback System has been proposed as a possible solution to stabilize the beam …
View article: Wideband Vertical Intra-Bunch Feedback at the SPS - Technology Development, Recent Accelerator Measurements and Next Steps
Wideband Vertical Intra-Bunch Feedback at the SPS - Technology Development, Recent Accelerator Measurements and Next Steps Open
A wideband vertical intra-bunch feedback system is in development at the CERN SPS for use to control potential Ecloud and TMCI instabilities. The work is motivated by planned intensity increases from the LIU and HL-LHC upgrade programs. Sy…
View article: Recent Upgrades to the CERN SPS Wideband Intra-bunch Transverse Feedback Processor
Recent Upgrades to the CERN SPS Wideband Intra-bunch Transverse Feedback Processor Open
In support of the CERN High Luminosity LHC (HL-LHC) upgrade program, a research and development effort has been underway to understand and develop feedback control techniques for mitigating transverse intra-bunch instabilities in the SPS d…
View article: Identification of Intra-bunch Transverse Dynamics for Model-Based Control Purposes at CERN Super Proton Synchrotron
Identification of Intra-bunch Transverse Dynamics for Model-Based Control Purposes at CERN Super Proton Synchrotron Open
The high luminosity upgrade plan for the LHC (HiLumi-LHC) increases the bunch intensity and the ultimate intensities require mitigation of possible intra-bunch instabilities in the SPS. Feedback systems can stabilize intra-bunch dynamics. …