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2020-11-27
17:31
Electron Cloud and Synchrotron Radiation characterization of technical surfaces with the Large Hadron Collider Vacuum Pilot Sector / Buratin, Elena (EPFL - Ecole Polytechnique Federale Lausanne (CH))
This PhD thesis presents the experimental study on electron cloud (EC) and synchrotron radiation (SR) phenomena affecting the LHC storage ring performance. These phenomena are one of the major issues of the LHC storage ring, generating beam instabili-ties, pressure rise and heat loads on the beam pipes. [...]
CERN-THESIS-2020-206.- 158 p. Fulltext: PDF; External link: Approve this document (restricted)

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2020-11-26
12:42
Dynamic simulations and transient management of the HL-LHC cryogenic system during beam operation / Bradu, Benjamin (CERN)
This paper presents a set of dynamic simulations performed on the future High Luminosity Large Hadron Collider (HL-LHC) cryogenic system. [...]
CERN-ACC-NOTE-2020-0060. - 2020. - 36 p.
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2020-11-18
11:30
Unidentified Falling Objects in the Large Hadron Collider: Formation, Charging Mechanisms and Dynamics of Dust Particulates in a High Energy Proton Accelerator / Belanger, Philippe
Micrometer-sized dust particulates present in the LHC beam pipe are known to be causing a large number of sporadic beam loss events all around the LHC, some of which are large enough to provoke protection dumps or induce magnet quenches [...]
CERN-THESIS-2020-196 http://hdl.handle.net/2429/76246 ; DOI:10.14288/1.0394575. - Vancouver : University of British Columbia, 2020-10-01. - 79 p.

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2020-11-10
06:52
Energy-resolved secondary-electron emission of candidate beam screen materials for electron cloud mitigation at the Large Hadron Collider / Schulte, S (Ilmenau Tech. U.) ; Hartung, G (Ilmenau Tech. U.) ; Kröger, J (Ilmenau Tech. U.) ; Himmerlich, M (CERN) ; Petit, V (CERN) ; Taborelli, M (CERN)
Energy-resolved secondary electron spectroscopy has been performed on air-exposed standard Cu samples and modified Cu surfaces that are tested and possibly applied to efficiently suppress electron cloud formation in the high-luminosity upgrade of the Large Hadron Collider at CERN. The Cu samples comprise pristine oxygen-free, carbon-coated and laser-structured surfaces, which were characterized prior to and after electron irradiation and rare-gas ion bombardment. [...]
2020 - 10 p. - Published in : Phys. Rev. Accel. Beams 23 (2020) 103101 Fulltext from Publisher: PDF;

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2020-11-06
09:32
ATLAS Experiment Colouring Book in Welsh | Llyfr lliwio’r Arbrawf ATLAS / Anthony, Katarina (Universita degli Studi di Udine (IT))
Language: Welsh - The ATLAS Experiment Colouring Book is a free-to-download educational book, ideal for kids aged 5-9. [...]
ATLAS-OUTREACH-2020-003. - 2020. - 16.
Language: wel

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2020-11-05
14:50
Noise effects in the Large Hadron Collider (LHC) and its High-Luminosity upgrade (HL-LHC) / Kostoglou, Sofia
In order to optimize the performance of a high-energy particle collider such as the Large Hadron Collider (LHC) and its high-luminosity upgrade (HL-LHC), a thorough understanding of all the phenomena that can act as a luminosity degradation mechanism is required [...]
CERN-THESIS-2020-169 - 189 p.

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2020-10-27
17:01
Impact and possible mitigation measures in case of failure of lattice sextupole and octupole circuits in Run 3 / Fartoukh, Stephane (CERN)
Depending on the machine configuration which is used in operation, the failure of some lattice sextupole and octupole circuits might have a substantial impact on the machine performance (β∗ and beam brightness limitations). [...]
CERN-ACC-NOTE-2020-0057. - 2020. - 25 p.
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2020-10-27
16:57
Combined ramp and telescopic squeeze / Fartoukh, Stephane (CERN) ; Azzopardi, Gabriella (CERN) ; Bruce, Roderik (CERN) ; Buffat, Xavier (CERN) ; Coello De Portugal - Martinez Vazquez, Jaime Maria ; Fuster Martinez, Nuria ; Iadarola, Giovanni (CERN) ; Karastathis, Nikos ; Kostoglou, Sofia (CERN) ; Maclean, Ewen Hamish (CERN) et al.
This paper highlights the outcome of the 2018 round ATS MD program, which aimed at demonstrating the feasibility of a combined ramp and telescopic squeeze as a potential key ingredient to operate the machine in Run 3, with much brighter and more energetic beams with respect to Run 2. [...]
CERN-ACC-2020-0028. - 2020. - 40 p.
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2020-10-27
16:18
MD2490 – Measurement of the TMCI threshold at flat-top in the LHC / Albert, Markus (CERN) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Antipov, Sergey ; Biancacci, Nicolo (CERN) ; Buffat, Xavier (CERN) ; Carver, Lee Robert (University of Liverpool (GB)) ; Fuchsberger, Kajetan ; Mereghetti, Alessio ; Metral, Elias (CERN) ; Mounet, Nicolas (CERN) et al.
This report summarizes the results of MD2490 on the measurement of the intensity threshold of the Transverse Mode Coupling Instability (TMCI) in the LHC at flat top. [...]
CERN-ACC-NOTE-2020-0056. - 2020.
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2020-10-06
17:47
MD3310 – Complex tune shift measurement at flat-top in the LHC / Amorim, David (Universite Grenoble-Alpes (FR)) ; Antipov, Sergey ; Biancacci, Nicolo (CERN) ; Buffat, Xavier (CERN) ; Giordano, Francesco (Universita e sezione INFN di Napoli (IT)) ; Hemelsoet, Georges-Henry (CERN) ; Levens, Tom (CERN) ; Metral, Elias (CERN) ; Mounet, Nicolas (CERN) ; Ribes Metidieri, Ariadna (University of Barcelona (ES)) et al.
This note summarises the MD3310 activity. [...]
CERN-ACC-NOTE-2020-0053. - 2020. - 6 p.
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