CERN Accelerating science

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2018-02-24
06:44
The use of a 90 metre thermosiphon cooling plant and associated custom ultrasonic instrumentation in the cooling of the ATLAS inner silicon tracker / Hallewell, Greg (Marseille, CPPM) ; Battistin, Michele (CERN) ; Berry, Stephane (CERN) ; Bonneau, Pierre (CERN) ; Bortolin, Claudio (CERN) ; Crespo-Lopez, Olivier (CERN) ; Deterre, Cecile (DESY) ; Doubek, Martin (Prague, Tech. U.) ; Favre, Gilles (CERN) ; Katunin, Sergey (St. Petersburg, INP) et al.
A new 60kW thermosiphon fluorocarbon cooling plant has been commissioned to cool the silicon tracker of the ATLAS experiment at the CERN LHC. The thermosiphon operates over a height of 90 metres and is integrated into the CERN UNICOS system and the ATLAS detector control system (DCS). [...]
2018 - 6 p. - Published in : 10.18429/JACoW-ICALEPCS2017-THPHA193 Fulltext: PDF;
In : International Conference on Accelerator and Large Experimental Physics Control Systems, Barcelona, Spain, 8 - 13 Oct 2017, pp.THPHA193

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2018-02-24
06:44
Development, commissioning and operation of the large scale CO$_2$ detector cooling systems for CMS pixel phase I upgrade / Ostrega, Maciej (CERN) ; Daguin, Jerome (CERN) ; Pavis, Steven (CERN) ; Petagna, Paolo (CERN) ; Tropea, Paola (CERN) ; Verlaat, Bart (CERN) ; Zwalinski, Lukasz (CERN)
During the 2017 Year-end Technical Stop of the Large Hadron Collider at CERN, the CMS experiment has successfully installed a new pixel detector in the frame of Phase I upgrade. This new detector will operate using evaporative CO$_{2}$ technology as its cooling system. [...]
2018 - 4 p. - Published in : 10.18429/JACoW-ICALEPCS2017-THPHA050 Fulltext: PDF;
In : International Conference on Accelerator and Large Experimental Physics Control Systems, Barcelona, Spain, 8 - 13 Oct 2017, pp.THPHA050

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2018-02-24
06:44
Information system for ALICE experiment data access / Jadlovsky, Jan (Kosice Tech. U.) ; Bond, Peter (CERN) ; Cabala, Jan (Kosice Tech. U.) ; Cerkala, Jakub (Kosice Tech. U.) ; Chochula, Peter (CERN) ; Hanc, Erik (Kosice Tech. U.) ; Jadlovska, Anna (Kosice Tech. U.) ; Jadlovska, Slavka (Kosice Tech. U.) ; Kopcik, Michal (Kosice Tech. U.) ; Oravec, Matej (Kosice Tech. U.) et al.
The main goal of this paper is the presentation of Dcs ARchive MAnager for ALICE Experiment detector conditions data (DARMA), which is the updated version of the AMANDA 3 software currently used within ALICE experiment at CERN. The typical user of this system is either a physicist who performs further analysis on data acquired during the operation of the ALICE detector or an engineer, who analyzes the detector status between iterations of experiments. [...]
2018 - 4 p. - Published in : 10.18429/JACoW-ICALEPCS2017-THPHA041 Fulltext: PDF;
In : International Conference on Accelerator and Large Experimental Physics Control Systems, Barcelona, Spain, 8 - 13 Oct 2017, pp.THPHA041

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2018-02-21
12:14
Beam-induced heat loads on the beam screens of the inner triplets for the HL-LHC / Skripka, Galina (CERN) ; Iadarola, Giovanni (CERN)
The expected heat load induced on the beam screens has been evaluated for the triplet assemblies in the four experimental Insertion Regions (IRs) of the HL-LHC [...]
CERN-ACC-NOTE-2018-0009.
- 2018. - 50 p.
Full text

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2018-02-20
15:34
Aperture measurements with AC dipole / Fuster Martinez, Nuria (CERN) ; Maclean, Ewen Hamish (CERN) ; Dilly, Joschua Werner (Ministere des affaires etrangeres et europeennes (FR)) ; Nevay, Laurence James (University of London (GB)) ; Bruce, Roderik (CERN) ; Tomas Garcia, Rogelio (CERN) ; Redaelli, Stefano (CERN) ; Persson, Tobias Hakan Bjorn (CERN)
During the MDs performed on the 15th of September and 29th of November 2017, we measured the LHC global aperture at injection with a new AC dipole method as well as using the Transverse Damper (ADT) blow-up method used during the 2017 LHC commissioning for benchmarking. [...]
CERN-ACC-NOTE-2018-0008.
- 2018. - 13 p.
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2018-02-20
10:11
Effect of a resonant excitation on the evolution of the beam emittance and halo population / Fitterer, Miriam (Fermi National Accelerator Lab. (US)) ; Stancari, Giulio (Fermi National Accelerator Lab. (US)) ; Valishev, Alexander (Fermi National Accelerator Lab. (US)) ; Bruce, Roderik (CERN) ; Redaelli, Stefano (CERN) ; Salvachua Ferrando, Belen Maria (CERN) ; Valuch, Daniel (CERN) ; Valentino, Gianluca (University of Malta (MT)) ; Wagner, Joschka (Johann-Wolfgang-Goethe Univ. (DE))
Collimation with hollow electron beams or lenses (HEL) is currently one of the most promising concepts for active halo control in HL-LHC. [...]
CERN-ACC-NOTE-2018-0007.
- 2018. - 144 p.
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2018-02-15
15:50
MD1271: Effect of low frequency noise on the evolution of the emittance and halo population / Fitterer, Miriam (Fermi National Accelerator Lab. (US)) ; Stancari, Giulio (Fermi National Accelerator Lab. (US)) ; Valishev, Alexander (Fermi National Accelerator Lab. (US)) ; Bruce, Roderik (CERN) ; Hofle, Wolfgang (CERN) ; Hostettler, Michi (Universitaet Bern (CH)) ; Papadopoulou, Parthena Stefania (CERN) ; Papotti, Giulia (CERN) ; Papaphilippou, Yannis (CERN) ; Pellegrini, Dario (CERN) et al.
For the High Luminosity upgrade the β* in IR1 and IR5 will be further reduced compared to the current LHC [...]
CERN-ACC-NOTE-2018-0006.
- 2018. - 40 p.
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2018-02-15
14:39
MD#1826: Measurement of Quench Heater vertical kick / Valette, Matthieu (CERN) ; Wollmann, Daniel (CERN) ; Lindstrom, Bjorn Hans Filip (Uppsala University (SE)) ; Bortot, Lorenzo (CERN) ; Fernandez Navarro, Alejandro (CERN) ; Schmidt, Rudiger (Technische Universitaet Darmstadt (DE)) ; Verweij, Arjan (CERN)
Following the observation of vertical orbit oscillations of the LHC beam between the detection of a (beam induced) quench of an LHC main dipole and the beam dump, a study was started to verify that the orbit distortions are caused by the firing of the quench heaters (QH). [...]
CERN-ACC-2018-0007.
- 2018. - 8 p.
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2018-02-14
16:42
Impact of the ADT on the beam quality with high brightness beams in collision (MD2155) / Buffat, Xavier (CERN) ; Furuseth, Sondre (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Kostoglou, Sofia (National Technical Univ. of Athens (GR)) ; Salvachua Ferrando, Belen Maria (CERN) ; Papadopoulou, Parthena Stefania (CERN) ; Ponce, Laurette (CERN) ; Solfaroli Camillocci, Matteo (CERN) ; Suykerbuyk, Ronaldus (CERN) ; Valuch, Daniel (CERN) ; Walsh, David John (CERN) et al.
The results of an experiment aiming at determining indirectly the noise level in the LHC, isolating the contribution of the transverse damper, through their impact on the emittance of colliding high brightness bunches at 6.5 TeV in the LHC are presented..
CERN-ACC-NOTE-2018-0005.
- 2018. - 12 p.
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2018-02-13
06:31
Operational Cycle / Solfaroli Camillocci, Matteo (CERN)
The LHC has been successfully operated at 4 TeV during 2012 run. An analysis of the critical points of the standard operational cycle has been made, aiming at increasing the performance and the efficiency of the machine. [...]
Geneva : CERN, 2012 - 4 p. - Published in : (2012) , pp. 23-26 Fulltext: PDF;
In : 4th Evian Workshop on LHC beam operation, Evian-les-Bains, France, 17 - 20 Dec 2012, pp.23-26

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