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NC Modelling & measurement of non-linear effects
/ Buzio, Marco (speaker) (CERN)
This lecture concerns the techniques to measure and model mathematically non-linear effects in iron-dominated magnets, with the aim to control the magnetic field with a high precision, 100 ppm or better, as typically required in particle accelerators. The topics covered include a review of the physical phenomenology of magnetic saturation, hysteresis and eddy currents in material samples and accelerator magnets, as well of the most popular models to represent them; a discussion on the available instrumentation and measurement techniques; and a survey of open-loop and closed-loop (feedback-based) magnetic field control methods, with a critical comparison about their cost and effectiveness..
2023 - 2632.
CERN Accelerator School; CAS course on "Normal- and Superconducting Magnets", 19 November - 02 December 2023, St. Pölten, Austria
External links: Talk details; Event details
In : CAS course on "Normal- and Superconducting Magnets", 19 November - 02 December 2023, St. Pölten, Austria
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Magnetic measurement systems overview
/ Buzio, Marco (speaker) (CERN)
This lecture provides a broad overview of the topic of measurement of the field generated by accelerator magnets. First, the need of magnet testing is put in context by comparing it with numerical modelling and beam-based measurements. [...]
2023 - 3807.
CERN Accelerator School; CAS course on "Normal- and Superconducting Magnets", 19 November - 02 December 2023, St. Pölten, Austria
External links: Talk details; Event details
In : CAS course on "Normal- and Superconducting Magnets", 19 November - 02 December 2023, St. Pölten, Austria
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Introduction to practical exercises
/ Yang, Yifeng (speaker) (University of Southampton (GB)) ; Eisterer, Michael (speaker) ; Buzio, Marco (speaker) (CERN) ; García-Tabarés, Luis (speaker) ; Fiscarelli, Lucio (speaker) (CERN)
2023 - 2613.
CERN Accelerator School; CAS course on "Normal- and Superconducting Magnets", 19 November - 02 December 2023, St. Pölten, Austria
External links: Talk details; Event details
In : CAS course on "Normal- and Superconducting Magnets", 19 November - 02 December 2023, St. Pölten, Austria
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Development of a Real-Time Magnetic Field Measurement System for Synchrotron Control
/ Vella Wallbank, Joseph (CERN ; U. Malta) ; Amodeo, Maria (CERN ; Turin Polytechnic) ; Beaumont, Anthony (CERN) ; Buzio, Marco (CERN) ; Di Capua, Vincenzo (CERN ; U. Naples (main)) ; Grech, Christian (CERN ; U. Malta) ; Sammut, Nicholas (U. Malta) ; Giloteaux, David (CERN)
The precise knowledge of the magnetic field produced by dipole magnets is critical to the
operation of a synchrotron. Real-time measurement systems may be required, especially in the case of
iron-dominated electromagnets with strong non-linear effects, to acquire the magnetic field and feed
it back to various users. [...]
2021 - 29 p.
- Published in : Electronics 10 (2021) 2140
Fulltext: PDF;
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Hysteresis Modeling in Iron-Dominated Magnets Based on a Multi-Layered NARX Neural Network Approach
/ Amodeo, Maria (CERN ; Turin Polytechnic ; U. Naples (main)) ; Arpaia, Pasquale (CERN ; U. Naples (main)) ; Buzio, Marco (CERN) ; Di Capua, Vincenzo (CERN ; U. Naples (main)) ; Donnarumma, Francesco (CNR, Italy)
A full-fledged neural network modeling, based on a Multi-layered Nonlinear Autoregressive Exogenous Neural Network (NARX) architecture, is proposed for quasi-static and dynamic hysteresis loops, one of the most challenging topics for computational magnetism. This modeling approach overcomes drawbacks in attaining better than percent-level accuracy of classical and recent approaches for accelerator magnets, that combine hybridization of standard hysteretic models and neural network architectures. [...]
2021 - 18 p.
- Published in : Int. J. Neural Syst. 31 (2021) 2150033
Fulltext: PDF;
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Error characterization and calibration of real-time magnetic field measurement systems
/ Grech, Christian (CERN ; Malta U.) ; Amodeo, Maria (Turin Polytechnic ; CERN) ; Beaumont, Anthony (CERN) ; Buzio, Marco (CERN) ; Capua, Vincenzo Di (CERN ; Naples U.) ; Giloteaux, David (CERN) ; Sammut, Nicholas (CERN ; Malta U.) ; Wallbank, Joseph Vella (CERN ; Malta U.)
In synchrotrons at the European Organization for Nuclear Research (CERN), magnetic measurement systems known as B-trains measure the magnetic field in the main bending magnets in real-time, and transmit this signal for the control of the synchrotron’s RF accelerating cavities, magnet power converter and beam monitoring systems. This work presents an assessment of the capabilities and performance of the new FIRESTORM (Field In REal-time STreaming from Online Reference Magnets) system as part of the first phase of commissioning. [...]
2021 - 9 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 990 (2021) 164979
Fulltext: PDF;
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