CERN Accelerating science

All CERN Accelerators documents

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2019-10-19
06:02
The ITER In-Vessel Coils – design finalization and challenges / Vostner, Alexander (Euratom, St. Paul Lez Durance) ; Bontemps, Vincent (Euratom, St. Paul Lez Durance) ; Encheva, Anna (Euratom, St. Paul Lez Durance) ; Jin, Huan (Hefei, Inst. Plasma Phys.) ; Laquiere, Julien (Euratom, St. Paul Lez Durance) ; Macioce, Davide (Euratom, St. Paul Lez Durance) ; Mariani, Nicola (Euratom, St. Paul Lez Durance) ; Mcintosh, Simon (Euratom, St. Paul Lez Durance) ; Peng, Xuebing (Euratom, St. Paul Lez Durance) ; Singh, Shuvay (CERN) et al.
ITER In-Vessel Coils (IVCs), resistive magnets to be installed in close proximity to ITER plasma to compensate fast perturbations of the plasma itself, have undergone a comprehensive revision of their requirements and operational loads, leading to design modifications and R&D; activities. An update of the plasma operating scenarios has been done and the maximum currents during transient plasma events have been assessed considering actual operating currents and the surrounding vacuum vessel support structure leading to more representative load cases. [...]
2019 - 6 p. - Published in : Fusion Eng. Des. 146 (2019) 1490-1495

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2019-10-19
06:02
Dynamic pressure in the LHC: Influence of ions induced by ionization of residual gas by both the proton beam and the electron cloud / Bilgen, Suheyla (Orsay, LAL) ; Baglin, Vincent (CERN) ; Bruni, Christelle (Orsay, LAL) ; Mercier, Bruno (Orsay, LAL) ; Sattonnay, Gaël (Orsay, LAL)
For the future HL-LHC or FCC study, the understanding of the beam interactions with the vacuum chamber is fundamental to provide solutions to mitigate the pressure rises induced by electronic, photonic and ionic molecular desorption. The proton beam circulating in the LHC vacuum chamber ionizes the residual gas producing electrons as well as positive ions. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-TUPMP004 Preprint: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.TUPMP004

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2019-10-19
06:02
Operational results of LHC collimator alignment using machine learning / Azzopardi, Gabriella (Malta U. ; CERN) ; Muscat, Adrian (Malta U.) ; Redaelli, Stefano (CERN) ; Salvachua, Belen (CERN) ; Valentino, Gianluca (Malta U.)
A complex collimation system is installed in the Large Hadron Collider to protect sensitive equipment from unavoidable beam losses. The collimators are positioned close to the beam in the form of a hierarchy, which is guaranteed by precisely aligning each collimator with a precision of a few tens of micrometers. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-TUZZPLM1 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.TUZZPLM1

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2019-10-19
06:02
Study of the transverse emittance blow-up along the Proton Synchrotron Booster cycle during wire scanner operation / Santamaría García, Andrea (CERN) ; Antoniou, Fanouria (CERN) ; Bartosik, Hannes (CERN) ; Briz Monago, Jose (CERN) ; Di Giovanni, Gian Piero (CERN) ; Guerrero Ollacarizqueta, Ana (CERN) ; Hunt, James (CERN) ; Mikulec, Bettina (CERN) ; Roncarolo, Federico (CERN) ; Senes, Eugenio (CERN) et al.
Transverse emittance measurements with wire scanners have been extensively studied across the accelerator complex at CERN due to their important role in characterizing the beams and their complicated modelling. In recent years, this topic has been of particular interest for the LHC Injectors Upgrade (LIU) project, where a tight transverse emittance blow-up budget between the Proton Synchrotron Booster (PSB) and the Proton Synchrotron (PS) is imposed to ensure the required beam brightness for the High Luminosity LHC (HL-LHC). [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-MOPTS101 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPTS101

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2019-10-19
06:02
Transverse emittance measurement in the CERN Proton Synchrotron in view of beam production for the High-Luminosity LHC / Senes, Eugenio (CERN ; JAI, UK ; U. Oxford (main)) ; Emery, Jonathan (CERN) ; Forte, Vincenzo (CERN) ; Fraser, Matthew (CERN) ; Guerrero Ollacarizqueta, Ana (CERN) ; Huschauer, Alexander (CERN) ; Roncarolo, Federico (CERN) ; Sirvent, Jose (CERN ; Barcelona U.) ; Skowroński, Piotr (CERN) ; Tecker, Frank (CERN)
In the framework of the LHC Injectors Upgrade project the improvements required to achieve the parameters of the future beams for the High-Luminosity LHC are being studied and implemented. In order to deliver high brightness beams, control over the beam intensity and emittance is fundamental. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-MOPTS100 Preprint: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPTS100

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2019-10-19
06:02
The development programme of cathodes and electron guns for the hollow electron lenses of the High Luminosity LHC project / Perini, Diego (CERN) ; Crawford, Darren (Fermilab) ; Feng, Jinjun (Vacuum Elect. Res. Inst., Beijing) ; Gobbi, Giorgia (CERN) ; Li, Zepeng (Vacuum Elect. Res. Inst., Beijing) ; Liu, Wei (Beijing U. of Tech.) ; Ruan, Jinhao (Fermilab) ; Shao, Wensheng (Vacuum Elect. Res. Inst., Beijing) ; Stancari, Giulio (Fermilab) ; Valerio, Linda (Fermilab) et al.
The High Luminosity LHC project (HL-LHC) foresees the construction and installation of important new equipment to increase the performance of the LHC machine. The Hollow Electron Lens (HEL) is a promising system to control the beam halo. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-MOPTS099 Preprint: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPTS099

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2019-10-19
06:02
PERLE: A high power energy recovery facility / Kaabi, Walid (Orsay, LAL) ; Angal-Kalinin, Deepa (Daresbury ; Cockcroft Inst. Accel. Sci. Tech.) ; Bogacz, Alex (Jefferson Lab) ; Bousson, Sébastien (Orsay, IPN) ; Brüning, Oliver (CERN) ; Calaga, Rama (CERN) ; Chaikovska, Iryna (Orsay, LAL) ; Dassa, Luca (CERN) ; Gerigk, Frank (CERN) ; Hounsell, Benjamin (Liverpool U. ; Cockcroft Inst. Accel. Sci. Tech. ; Orsay, LAL) et al.
PERLE is a proposed high power Energy Recovery Linac, designed on multi-turn configuration, based on SRF technology, to be hosted at Orsay-France in a collaborative effort between local laboratories: LAL and IPNO, together with an international collaboration involving today: CERN, JLAB, STFC ASTeC Daresbury, Liverpool University and BINP Novosibirsk. PERLE will be a unique leading edge facility designed to push advances in accelerator technology, to provide intense and highly flexible test beams for component development. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-TUPGW008 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.TUPGW008

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2019-10-19
06:02
Data-driven controller design using the CERN Power Converter Control Libraries (CCLIBS) / Nicoletti, Achille (CERN) ; Martino, Michele (CERN)
The data-driven control approach is a control methodology in which a controller is designed without the need of a model. Parametric uncertainties and the associated unmodeled dynamics are therefore irrelevant; the only source of uncertainty comes from the measurement process. [...]
2019 - 3 p. - Published in : 10.18429/JACoW-IPAC2019-TUPMP039 Preprint: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.TUPMP039

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2019-10-19
06:01
Recent developments of Monte-Carlo codes Molflow+ and Synrad+ / Kersevan, Roberto (CERN) ; Ady, Marton (CERN)
Molflow+ and Synrad+ are Monte Carlo simulation tools for ultra-high vacuum and synchrotron radiation, respectively. Over the years they have become a common tool for designing and analysing the vacuum system of particle accelerators. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-TUPMP037 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.TUPMP037

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2019-10-19
06:01
A modular optical firing interface for CERN’s generic power converter control platform / Di Cosmo, Matteo (CERN) ; Gaime, Thomas (CERN) ; Todd, Benjamin (CERN)
The power converters group at CERN has developed a third generic converter controller (FGC3) and regulation platform (RegFGC3), capable of controlling any of CERN's power converters. This platform provides electrical connections to the low-level control elements of power converters, and in some cases a galvanic isolation is required between the converter controller output, and the power converter under control. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-TUPMP034 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.TUPMP034

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