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Projects, Upgrade and Consolidation Projects

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2019-02-06
14:17
Update of beam dynamics requirements for HL-LHC electrical circuits / Gamba, Davide (CERN) ; Arduini, Gianluigi (CERN) ; Cerqueira Bastos, Miguel (CERN) ; Coello De Portugal - Martinez Vazquez, Jaime Maria (Universitat Politecnica Catalunya (ES)) ; De Maria, Riccardo (CERN) ; Giovannozzi, Massimo (CERN) ; Martino, Michele (CERN) ; Tomas Garcia, Rogelio (CERN)
Since the publication of the document providing the specifications of the new circuits of the HL-LHC (see CERN-ACC-2017-0101), using criteria based on beam dynamics considerations, more accurate performance expectations of the power converter technology have been made available. [...]
CERN-ACC-2019-0030. - 2019.

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2019-01-28
10:57
LHC Full Energy Exploitation Study: Operation at Ultimate Energy of 7.5 TeV / Bruning, Oliver (CERN) ; Antipov, Sergey (CERN) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Arduini, Gianluigi (CERN) ; Apollonio, Andrea (CERN) ; Ball, Austin (CERN) ; Baglin, Vincent (CERN) ; Bartmann, Wolfgang (CERN) ; Battistin, Michele (CERN) ; Biancacci, Nicolo (CERN) et al.
This report discusses the feasibility and limitations for operating the LHC and HL-LHC at the ultimate beam energy of 7.5 TeV, corresponding to a main dipole magnetic field of 8.93 T and an operating current of 12748 A..
CERN-ACC-2019-0015. - 2019. - 57 p.

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2019-01-24
09:52
Staged implementation of low-impedance collimation in IR7: plans for LS2 / Redaelli, Stefano (CERN) ; Antipov, Sergey (CERN) ; Biancacci, Nicolo (CERN) ; Bertarelli, Alessandro (CERN) ; Bruce, Roderik (CERN) ; Carra, Federico (CERN) ; Gobbi, Giorgia (CERN) ; Lechner, Anton (CERN) ; Mereghetti, Alessio (CERN) ; Metral, Elias (CERN)
The HL-LHC upgrade baseline foresees to replace all secondary collimators of IR7 until LS3 in order to ensure a sufficient margin for beam stability with the high-brightness upgraded beams [...]
CERN-ACC-NOTE-2019-0001. - 2019. - 30 p.
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2019-01-15
09:36
Magnetic Frequency Response of High-Luminosity Large Hadron Collider Beam Screens / Morrone, Marco (CERN, Imperial College London) ; Martino, Michele (CERN) ; De Maria, Riccardo (CERN) ; Fitterer, Miriam (FNAL) ; Garion, Cedric (CERN)
Magnetic fields used to control particle beams in accelerators are usually controlled by regulating the electrical current of the power converters. [...]
CERN-ACC-2019-0004. - 2019. - 22 p.
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2018-12-20
14:54
High Energy Hadrons Fluence Measurements in the LHC during 2015, 2016 and 2017 Proton Physics Operations. / Martinella, Corinna (University of Jyvaskyla (FI))
In order to reduce the risk of failure for the electronic equipment installed in the underground areas of LHC, every year the Radiation Monitors (RadMons) are used to measure the High Energy Hadrons (HEH) fluence in the tunnel and in the shielded areas. [...]
CERN-ACC-NOTE-2018-0088. - 2018. - 47 p.
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2018-11-22
10:02
Integration of Wireless Mobile Equipment in Vacuum Supervisory Applications / Blanchard, Sebastien (CERN) ; Ferreira, Rodrigo (CERN) ; Gomes, Paulo (CERN)
At first sight, the data acquisition and remote control of equipment temporary used during the commissioning phase of a vacuum system seems not to be a high priority requirement [...]
CERN-ACC-NOTE-2018-0076. - 2018. - 14 p.

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2018-11-21
14:13
TDIS pressure profile simulations after LS2 / Ribes Metidieri, Patricia (University of Barcelona (ES)) ; Yin Vallgren, Christina (CERN) ; Skripka, Galina (CERN) ; Iadarola, Giovanni (CERN) ; Bregliozzi, Giuseppe (CERN)
During the LS2 (Long Shutdown 2), the current TDI (Beam Absorber for Injection) will be replaced by the new so called, TDIS (Beam Absorber for Injection Segmented). [...]
CERN-ACC-NOTE-2018-0075. - 2018. - 18 p.
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2018-11-16
14:11
Radiation levels in the LHC during the 2015 Pb-Pb and 2016 p-Pb run and mitigation strategy for the electronic systems during HL-LHC operation / Martinella, Corinna (University of Jyvaskyla (FI)) ; Bahamonde Castro, Cristina (Ministere des affaires etrangeres et europeennes (FR)) ; Lechner, Anton (CERN) ; Danzeca, Salvatore (CERN) ; Kadi, Yacine (CERN) ; Brugger, Markus (CERN) ; Garcia Alia, Ruben (CERN)
During the Pb-Pb and p-Pb operations of LHC, high localized beam losses can induce a risk of failure for the electronic systems installed in the tunnel. [...]
CERN-ACC-NOTE-2018-0073. - 2018. - 13 p.
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2018-09-20
15:05
A High-Brilliance Angstrom-FEL based on the LHeC / Nergiz, Zafer (Ankara University Institute of Accelerator Technologies (TR)) ; Aksakal, Husnu (Kahramanmaras Sutcu Imam Universitesi (TR)) ; Zimmermann, Frank (CERN)
The Large Hadron electron Collider (LHeC) is a proposed future particle physics project colliding 60 GeV electrons from a recirculating energy-recovery linac (ERL) with 7 TeV protons stored in the LHC. [...]
CERN-ACC-NOTE-2018-0061 ; ARIES 18-001. - 2018. - 6 p.
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2018-05-31
13:49
Crab Cavity effects on transverse distribution evolution and tail cleaning in the HL-LHC / Baudrenghien, Philippe (CERN) ; Mastoridis, Themistoklis (California Polytechnic State Univ. (US)) ; Steeper, S (California Polytechnic State Univ. (US)) ; Tucker, D (California Polytechnic State Univ. (US)) ; Wieker, Devin (California Polytechnic State Univ. (US))
This work presents the transverse action and tune distribution evolution as a function of the Crab Cavity RF noise Power Spectral Density (PSD). [...]
CERN-ACC-NOTE-2018-0042. - 2018. - 10 p.
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