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2019-05-13
11:28
Tolerance study for accelerating structure in the CLIC main linac / Liu, Jiayang (Tsinghua University / CERN) ; Grudiev, Alexej (CERN)
The tolerances are essential for defining the fabrication shape accuracy specification as well as the structure temperature control. [...]
CERN-ACC-2019-0049 ; CLIC-Note-1142. - 2019. - 17 p.
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2019-03-22
10:05
The High-Luminosity Large Hadron Collider / Bruning, Oliver (CERN) ; Rossi, Lucio (CERN)
Oliver Brüning and Lucio Rossi discuss an upgrade of the Large Hadron Collider (LHC), the High-Luminosity LHC (HL-LHC), which aims to significantly increase the luminosity..
CERN-ACC-2019-0039.- Geneva : CERN, 2019 - 3 p. - Published in : Nature Rev. Phys. 1 (2019) 1 External link: Fulltext (read only)

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2019-03-14
16:15
An Approach to Reliability Assessment of Complex Systems at CERN / Blumenschein, Miriam Ruth (CERN) ; Spasic, Jelena (CERN) ; Steckert, Jens (CERN) ; Uythoven, Jan (CERN)
This paper presents the systematic approach Reliability Requirements and Initial Risk Evaluation (RIRE) developed and used at CERN [...]
CERN-ACC-2019-0038. - 2019. - 6 p.
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2019-02-12
17:06
MD#2889: 16L2 Event Dynamics and UFO Nature Investigation / Lindstrom, Bjorn Hans Filip (Uppsala University (SE)) ; Apollonio, Andrea (CERN) ; Dziadosz, Martyna (AGH University of Science and Technology (PL)) ; Gorzawski, Arkadiusz (University of Malta (MT)) ; Grob, Laura Katharina ; Holzer, Eva Barbara (CERN) ; Lechner, Anton (CERN) ; Medvedeva, Tatiana (Russian Academy of Sciences (RU)) ; Schmidt, Rudiger (Technische Universitaet Darmstadt (DE)) ; Valette, Matthieu et al.
Micrometer sized particles (UFOs) entering the beam are a known cause of localized beam losses since the beginning of high intensity beam operation, however the origin of these particles is not fully known [...]
CERN-ACC-2019-0032. - 2019. - 5 p.
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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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2019-02-04
15:25
Detailed review of the LHC optics commissioning for the nonlinear era / Maclean, Ewen Hamish (University of Malta (MT)) ; Tomas Garcia, Rogelio (CERN) ; Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Coello De Portugal - Martinez Vazquez, Jaime Maria (Universitat Politecnica Catalunya (ES)) ; Fol, Elena (Johann-Wolfgang-Goethe Univ. (DE)) ; Fuchsberger, Kajetan (CERN) ; Garcia-Tabares Valdivieso, Ana (Universidad Complutense (ES)) ; Giovannozzi, Massimo (CERN) ; Hofer, Michael (Vienna University of Technology (AT)) ; Malina, Lukas (CERN) et al.
In 2017, optics commissioning strategy for low-β∗ operation of the CERN Large Hadron Collider (LHC) underwent a major revision. [...]
CERN-ACC-2019-0029. - 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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2019-01-15
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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2019-01-11
09:57
MD#1828: Beam scraping in case of non-working LBDS / Valette, Matthieu ; Lindstrom, Bjorn Hans Filip (Uppsala University (SE)) ; Mereghetti, Alessio (CERN) ; Schmidt, Rudiger (Technische Universitaet Darmstadt (DE)) ; Solfaroli Camillocci, Matteo (CERN) ; Uythoven, Jan (CERN) ; Valuch, Daniel (CERN) ; Wenninger, Jorg (CERN) ; Wollmann, Daniel (CERN) ; Zerlauth, Markus (CERN)
In the very unlikely event of a non-working beam dumping system in the LHC, the up to 360 MJ (680 MJ for HiLumi) of beam energy per beam can be dissipated in the collimation system as a last alternative to an extraction into the beam dump. [...]
CERN-ACC-2019-0002. - 2019. - 6 p.
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2018-12-21
13:01
BE Department Annual Report 2017 / Collier, Paul (CERN) ; Arduini, Gianluigi (CERN) ; Billen, Ronny (CERN) ; Hatziangeli, Eugenia (CERN) ; Jensen, Erk (CERN) ; Jones, Rhodri (CERN) ; Lamont, Mike (CERN) ; Mackney, Anna (CERN) ; Sollander, Peter (CERN) ; Steerenberg, Rende (CERN)
The Beams Department hosts the Groups responsible for the beam generation, acceleration, diagnostics, controls and performance optimization for the whole CERN accelerator complex. [...]
CERN-ACC-2018-0063. - 2018. - 70 p.
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