CERN Accelerating science

LHC

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2018-04-23
09:05
Proposal for a Simplified Management of Accelerator Settings in the Injector Complex Based on Automatic Setting Propagation / Damerau, Heiko (CERN)
With the increasing number of beams with different characteristics the number of controls settings to pilot the accelerator hardware has grown proportionally. [...]
CERN-ACC-NOTE-2018-0037.
- 2018. - 6 p.

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2018-04-20
16:04
Status of the studies on collective effects involving beam-beam interactions at the HL-LHC / Buffat, Xavier (CERN) ; Barraud, Laurent (Universite Pierre et Marie Curie et Universite Denis Diderot (FR)) ; Metral, Elias (CERN) ; Ribes Metidieri, Ariadna (University of Barcelona (ES)) ; Barranco Garcia, Javier (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Goncalves Jorge, Patrik ; Pieloni, Tatiana (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Tambasco, Claudia (EPFL - Ecole Polytechnique Federale Lausanne (CH))
This note summarised the status of the studies on the coherent beam-beam effects in the HL-LHC project. [...]
CERN-ACC-NOTE-2018-0036.
- 2018. - 24 p.
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2018-04-20
15:58
Report from LHC MDs 1391 and 1483: Tests of new methods for study of nonlinear errors in the LHC experimental insertions / Maclean, Ewen Hamish (University of Malta (MT)) ; Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Fuchsberger, Kajetan (CERN) ; Giovannozzi, Massimo (CERN) ; Persson, Tobias Hakan Bjorn (CERN) ; Tomas Garcia, Rogelio (CERN)
Nonlinear errors in experimental insertions can pose a significant challenge to the operability of low-β∗ colliders. [...]
CERN-ACC-NOTE-2018-0035.
- 2017. - 14 p.

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2018-04-20
15:54
Report from LHC MD 1391: First tests of the variation of amplitude detuning with crossing angle as an observable for high-order errors in low-β∗ colliders / Maclean, Ewen Hamish (University of Malta (MT)) ; Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Fuchsberger, Kajetan (CERN) ; Giovannozzi, Massimo (CERN) ; Persson, Tobias Hakan Bjorn (CERN) ; Tomas Garcia, Rogelio (CERN)
Nonlinear errors in experimental insertions can pose a significant challenge to the operability of low-β∗ colliders. [...]
CERN-ACC-NOTE-2018-0034.
- 2017. - 10 p.

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2018-04-18
06:13
Simulations in Support of Wire Beam-Beam Compensation Experiment at the LHC / Patapenka, Andrei (NIU, DeKalb ; Fermilab) ; Papaphilippou, Yannis (CERN) ; De Maria, Riccardo (CERN) ; Valishev, Alexander (Fermilab)
The compensation of long-range beam-beam interaction with current wires is considered as a possible technology for the HL-LHC upgrade project. A demonstration experiment is planned in the present LHC machine starting in 2018. [...]
NAPAC-2016-TUPOB17.- 2017 - 3 p. - Published in : 10.18429/JACoW-NAPAC2016-TUPOB17 Fulltext: PDF; External link: JACoW
In : 2016 North American Particle Accelerator Conference, Chicago, IL, USA, 9 - 14 Oct 2016, pp.TUPOB17

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2018-04-18
06:13
Multiphysics Analysis of Crab Cavities for High Luminosity LHC Upgrade / Kononenko, Oleksiy (SLAC) ; Calaga, Rama (CERN) ; Li, Zenghai (SLAC) ; Zanoni, Carlo (CERN)
Development of the superconducting RF crab cavities is one of the major activities under the high luminosity LHC upgrade project that aims to increase the machine discovery potential. The crab cavities will be used for maximizing and leveling the LHC luminosity hence having tight tolerances for the operating voltage and phase. [...]
NAPAC-2016-MOB2CO04.- 2017 - 3 p. - Published in : 10.18429/JACoW-NAPAC2016-MOB2CO04 Fulltext: PDF; External link: JACoW
In : 2016 North American Particle Accelerator Conference, Chicago, IL, USA, 9 - 14 Oct 2016, pp.MOB2CO04

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2018-04-13
10:26
MD2065: Emittance exchange with linear coupling / Carver, Lee Robert (University of Liverpool (GB)) ; Buffat, Xavier (CERN) ; Persson, Tobias Hakan Bjorn (CERN) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Levens, Tom (CERN) ; Pesah, Arthur Chalom
In order to better understand the luminosity imbalance between ATLAS and CMS that was observed in 2016, it was proposed to perform a test whereby the horizontal and vertical emittances are exchanged by crossing the tunes in the presence of linear coupling. [...]
CERN-ACC-NOTE-2018-0033.
- 2018. - 4 p.
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2018-04-13
06:37
Future of the LHC / Forty, Roger (CERN)
The future of the LHC is discussed, considering aspects related to the accelerator, experiments, and physics. This includes the recently-approved high luminosity upgrade, HL-LHC, and beyond..
2017 - 8 p. - Published in : Frascati Phys. Ser.: 64 (2017) , pp. 19-26 Fulltext: PDF;
In : Vulcano Workshop 2016, Sicily, Italy, 22 - 28 May 2016, pp.19-26

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2018-04-10
06:02
Design and radiation tests on a LED based emergency evacuation directional lighting / Trikoupis, Nikolaos (CERN) ; Casas, Juan (CERN)
A LED (Light Emitting Diode) based directional lighting system has been designed to indicate the best evacuation direction for applications like the Large Hadron Collider (LHC) tunnel. The design includes constraints for redundancy required by safety systems and for components selection by radiation effects. [...]
SISSA, 2017 - 5 p. - Published in : PoS TWEPP-17 (2017) 092 Fulltext: PDF; External link: PoS server
In : Topical Workshop on Electronics for Particle Physics, Santa Cruz, Ca, United States Of America, 11 - 15 Sep 2017, pp.092

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2018-04-03
16:30
MD2725: 16L2 aperture measurement / Mirarchi, Daniele ; Redaelli, Stefano (CERN) ; Rossi, Roberto (Sapienza Universita e INFN, Roma I (IT))
Dumps induced by sudden increase of losses in the half-cell 16L2 have been a serious machine limitation during the 2017 run. [...]
CERN-ACC-NOTE-2018-0030.
- 2018. - 8 p.
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