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Development of a rotating-coil scanner for superconducting accelerator magnets
/ Rogacki, P (CERN ; RWTH Aachen U.) ; Fiscarelli, L (CERN) ; Russenschuck, Stephan (CERN) ; Hameyer, K (RWTH Aachen U.)
The superconducting magnets for High-Luminosity Large Hadron Collider (HL-LHC) upgrade project at CERN require magnetic measurements with high precision in field angle and multipole field errors. The paper describes the design, development, and metrological characterization of a new, rotating-coil magnetometer and a transport system to scan the magnetic field along the axis of the accelerator magnet..
2019 - 9 p.
- Published in : 10.5162/sensoren2019/3.4.3
Fulltext: PDF;
In : 20th GMA/ITG-Fachtagung Sensoren und Messsysteme 2019, Nürnberg, Germany, 25 - 26 Jun 2019, pp.275-282
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Feedback design for control of the micro-bunching instability based on reinforcement learning
/ Boltz, T (KIT, Karlsruhe) ; Brosi, M (KIT, Karlsruhe) ; Bründermann, E (KIT, Karlsruhe) ; Haerer, B (KIT, Karlsruhe) ; Kaiser, P (KIT, Karlsruhe) ; Pohl, C (KIT, Karlsruhe) ; Schreiber, P (KIT, Karlsruhe) ; Yan, M (KIT, Karlsruhe) ; Asfour, T (KIT, Karlsruhe) ; Müller, A -S (KIT, Karlsruhe)
The operation of ring-based synchrotron light sources with short electron bunches increases the emission of coherent synchrotron radiation in the THz frequency range. However, the micro-bunching instability resulting from self-interaction of the bunch with its own radiation field limits stable operation with constant intensity of CSR emission to a particular threshold current. [...]
2020 - 3 p.
- Published in : 10.23732/CYRCP-2020-009.227
Fulltext: PDF;
In : ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23 - 27 Sep 2019, pp.227-229 (CERN-2020-009)
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High-performance permeability measurements: A case study at CERN
/ Arpaia, Pasquale (Sannio U. ; CERN) ; Buzio, Marco (CERN) ; Fiscarelli, Lucio (Sannio U. ; CERN) ; Montenero, Giuseppe (Sannio U. ; CERN) ; Walckiers, Louis (CERN)
An accurate and flexible system for magnetic permeability measurements is described. In particular, effects such as eddy currents and signal drift are minimized by exploiting the main system features: (i) high-performance digital integration by means of a digital integrator, with a theoretical resolution of 10 ppt using an 18-Bit A/D Converter at 800 kS/s, specifically developed for magnetic measurements, and (ii) flexibility of the measurement procedure for overcoming magnetic field non-uniformity errors through a procedure specifically generated by means of a flexible software framework. [...]
2010 - 4 p.
- Published in : 10.1109/IMTC.2010.5488003
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Field Quality of MBH 11-T Dipoles for HL-LHC and Impact on Beam Dynamic Aperture
/ Fiscarelli, Lucio (CERN) ; Giovannozzi, Massimo (CERN) ; Hermes, Pascal Dominik (CERN) ; Izquierdo Bermudez, Susana (CERN) ; Russenschuck, Stephan (CERN) ; Savary, Frederic (CERN)
For the high-luminosity upgrade of the Large Hadron Collider (HL-LHC), the development of the 11-T Nb$_{3}$Sn dipole (MBH) is progressing. At present, one double-aperture and five single-aperture short-model magnets have been built and tested. [...]
2018 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 28 (2018) 4004005
In : 25th International Conference on Magnet Technology, Amsterdam, The Netherlands, 27 Aug - 1 Sep 2017, pp.4004005
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Status of negative momentum compaction operation at KARA
/ Schreiber, P (KIT, Karlsruhe) ; Boltz, T (KIT, Karlsruhe) ; Brosi, M (KIT, Karlsruhe) ; Haerer, B (KIT, Karlsruhe) ; Mochihashi, A (KIT, Karlsruhe) ; Papash, A I (KIT, Karlsruhe) ; Schuh, M (KIT, Karlsruhe) ; Müller, A -S (KIT, Karlsruhe)
For future synchrotron light sources different operation modes are of interest. Therefore various modes are currently being tested at the Karlsruhe Research Accelerator (KARA) including optics for a negative momentum compaction factor. [...]
2020 - 3 p.
- Published in : 10.23732/CYRCP-2020-009.297
Fulltext: PDF;
In : ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23 - 27 Sep 2019, pp.297-299 (CERN-2020-009)
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Geometric field errors of short models for MQXF, the Nb$_{3}$Sn low-$\beta$ quadrupole for the High Luminosity LHC
/ Izquierdo Bermudez, Susana (CERN) ; Ambrosio, Giorgio (Fermilab) ; Bajas, Hugues (CERN) ; Chlachidze, Guram (Fermilab) ; Ferradas Troitino, Jose (CERN) ; Ferracin, Paolo (CERN) ; Fiscarelli, Lucio (CERN) ; Hagen, Per (CERN) ; Holik, Eddie Frank (Fermilab) ; Di Marco, Joseph (Fermilab) et al.
In the framework of the high-luminosity upgrade of the large hadron collider, the U.S. LARP collaboration and CERN are jointly developing a 150-mm aperture Nb$_{3}$Sn quadrupole for the Large Hadron Collider (LHC) interaction regions. [...]
2018 - 6 p.
- Published in : IEEE Trans. Appl. Supercond. 28 (2018) 4006306
In : 25th International Conference on Magnet Technology, Amsterdam, The Netherlands, 27 Aug - 1 Sep 2017, pp.4006306
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Studies of Longitudinal Dynamics in the Micro-Bunching Instability Using Machine Learning
/ Boltz, Tobias (KIT, Karlsruhe) ; Brosi, Miriam (KIT, Karlsruhe) ; Bründermann, Erik (KIT, Karlsruhe) ; Müller, Anke-Susanne (KIT, Karlsruhe) ; Schwarz, Markus (CERN) ; Schönfeldt, Patrik (KIT, Karlsruhe) ; Yan, Minjie (KIT, Karlsruhe)
The operation of synchrotron light sources with short electron bunches increases the emitted CSR power in the THz frequency range. However, the spatial compression leads to complex longitudinal dynamics, causing the formation of micro-structures in the longitudinal bunch profiles. [...]
2018 - 3 p.
- Published in : 10.18429/JACoW-IPAC2018-THPAK030
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.THPAK030
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